3800 misfire at idle

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  • 3800 misfire at idle Hello everyone, new here. Under this scenario, one of the electronic sensors has gone bad and is causing the car's computer to malfunction and improperly calculate the amount of fuel the engine needs. The lean misfire may decrease or disappear as the engine speed increases because the efficiency of the volumetric flow into the combustion chambers increases dramatically. If you know anyone that has a scan tool that can access the mode $06, it will also tell you which cylinders are missing by percentage. It will start up again and idle but if I give it gas it misfires and dies. This can happen if the lower intake manifold gaskets were replaced in the last few months. The cause is often a problem in the idle air control system. The "soft" misfire, often called a surge, is commonly associated with fuel related issues. It's not a bad misfire or horrible idlejust enough to notice. 3 ms at idle for NA engine), and DTC code P0171 may be set. The problem starts after the car is fully warmed up and let to hot soak for 30-60 minutes. Ok here it is: I have a 2005 rs. Another way to figure out if a misfire is a bad coil is to swap two of the coils on the coil pack. My car was running perfectly until I disconnected the negative battery terminal to install fog light bulbs. My 01 Regal (L67 3. Best Answer: Cylinders 3 and 6 fire off of the same ignition coil. The P0420 code is a very popular one and that's why there's a site dedicated to that specific trouble code. Later 3800 Series 2 engines do not even have this bottom port. When a misfire occurs, engine speed will fluctuate. Tech A says that the sensor should show over 100 grams per second on a scan tool display when the accelerator is depressed to WOT (wide open throttle) on a running engine. The colder it gets, the more likely it is to throw a misfire code, and the misfires have progressed to all four cylinders. The code often will be a P0300 random misfire code, or you may find one or more misfire codes for individual cylinders, depending on which injectors are most affected. When the engine is warmed up, cylinders 2&4 start misfiring randomly. The problem is its Misfiring at idle on cylinder #2 AT IDLE ONLY. Now 2 months later and at 126,000 it began to idle rough again and check engine light came on so I took it back to GM Dealer and was informed that cylinder 7 has misfire and plug was fouled and replaced the plug (oh, and added some oil additive) - feel like I've been here before. Re: 2000 Pontiac Grand Prix, 3800---struggles at idle Ok, I was going to do that exact MAF cleaning today, but was stopped by the blasted tamper resistant torx screws. It was idling noticeably rough as expected. 4 million cars with its 3800 model V6 engines. I just wanted to thank everyone for their input. What to Look For The first thing to do if you’re confronted by a misfire or rough idle, is to gather as much information as you can to assist your mechanic in diagnosing the problem. Just acting weird I started it up and let it idle in D with the AC and rear defroster on for over two minutes - I let it go until it reached operating temp. Need some suggestions to solve getting Multiple Cylinder Misfire on a 1997 3800 with about 144,000 miles on it. 8L V8 Vortec engine started flashing a check engine light. 500) is above 100% (109. Ok, here I go again with another question about the 99 Camaro with the 3800 Series II V6. 1 OBDII Primer – Short Term & Long Term Fuel Trims OBDII, or On-Board Diagnostics 2nd Generation, has to do with two things. A misfire under load complaint can usually be broken down into 2 categories. cause a misfire at idle, but can also when accelerating. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. Fuel economy may also be down. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. Common Symptoms of a BAD Ignition Coil Pack and/or Spark Plug Wires. gm forum at Car Dealer Forums; I have a '99 Intrigue with 3800 motor that is overheating. If the misfire is only at idle, under no load, and disappears when you press the gas pedal (or gets worse when you go from park to drive), the most common issue on older cars is a vacuum leak (or dirty throttle body / idle air control valve). A misfire will dump unburnt fuel into the exhaust. You know how sometimes an older car may have a rough idle? It's kinda like a single instance of rough idle, but under load and at 3800 RPM. The "sharp" misfire, on the other hand, frequently relates to ignition problems. 3. NAIOA - 2000-2005 General Impala Discussion - Rough start / idle - crank sensor? - Does anyone have any other ideas what might be causing this? - 2002 Impala LS (3800 V6) 113k miles Most of the time when I start the car, the idle is erratic for the first The shudder at idle could be a bad plug, plug wire, or coil pack which is causing a misfire. 1991 Buick Regal, 3800 V6 Having a rough idle on a cold start. Subject: Re: Misfire, rough idle, and lacks power. If you turn the ignition switch off and restart the car it will run fine untill it does it again. Here's the reason why: The ignition control module sends the ignition coil one signal to activate and fire both ignition coil towers. It has approx 250,000 miles on it and runs very well most of the time. any recommendations? A metal tube routed up through the lower metal intake manifold from the Exhaust Gas Recirculation Valve burns holes in the plastic manifold it extends into, allowing coolant to be mixed into the crankcase engine oil and combustion chambers. Giving up on random misfire at idle; Thread: Giving up on random misfire at idle. Done Sofar Replaced upper intake man , new Coil control m Weakening fuel pump - the engine may idle with or without misfires, but will misfire at higher RPM, under acceleration, or under load. 1 L. I did replace the Cat because it showed low flow. The misfire may or may not be felt and the misfire could occur at all RPM or just a specific rpm, such as idle only or only at high rpm. Read questions and answers on what to check and how to fix it. Sat there and scratched my head a few minutes and it started up and I drove home with no problem. Engine rough idle can be caused by a series of problems, or just one faulty component or adjustment. - NOT ignition control module TRIED: swapping a working coil - issue persist Replaced ignition module - issue persist Test old and new modules - tested good. 8L V6 engine has had a production run lasting more than 30 years. i cleaned my Thread by: madeintheshade05 , Aug 18, 2008 , 5 replies, in forum: 4th Gen Camaro LT1 (1993-1997 Camaro) INTENSE™ has dynoed hundreds of 3800-based vehicles, and we understand the areas where the factory PCM is holding us back. 8L 3800 Series 1) × Help us help you. Threads Tagged with misfire . We then did a “wild” code check on the motorcycle and got a code for the Powertrain), P1356-no fire at rear jug. Lower intake gaskets were leaking and coolant was dripping Weakening fuel pump - the engine may idle with or without misfires, but will misfire at higher RPM, under acceleration, or under load. 6) Congratulations, man. Rough Idle, misfire and high idling issues That was a 3800 IDLE TUNING Foreword by Rinkrat456: This article is literally copied and pasted from Krambo's Silverado SS page. 2000 Ford Taurus The first, check engine light on, it was for the EGR valve and misfire on Cylinder 1. Cylinder #3 Misfire Detected. 8L 3800 Series II firing order and layout 01-13-06 05:24 PM - Post# 852790 In response to codebrown From the front of the car, 1 is first, and 4 is second on the coilpack. . Ciols all fire across with wires off and it is a strong spark. Why does my 97 firebird 3800 misfire under load with out any engine light or codes setting? You could have a problem with exhaust back-pressure which can stem from a restricted converter. What sucks, is that so many things can cause a misfire condition (or a rough idle condition). Learn common causes for this problem. Finding the problem can be daunting, especially with so many sensors and switching valves involved. It performs much the same function as any electronic throttle: to control the amount of air going into the engine so the computer can match it with the right amount of fuel. It could happen at any time: You are driving on the highway, moving A MAF sensor on a General Motors 3800 V-6 is being tested for contamination. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. Engine misfire – poor air/fuel mixture in the cylinders can cause an incomplete combustion event. No I don't mean harder plugs, competition coils, lumenition etc. running very rough - My girl's car suddenly started to run like it was only firing on half the cylinders yesterday, I bought new Register Log In Home Page and Articles Forums Mechanical/Maintenance Forum endless misfires w 3800 V6 Forums Active Threads Forum Help Pennzoil Synthetics Recent Topics The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles. A misfire may occur when your engine is idling, causing a rough or uneven idle. Lol and just to be clear this is just on the 3100 and not applicable to the 3800 GM recalled 1. It has fuel pressure at the rail and I know the injectors are firing due to noid light testing and the plugs being wet with gas. A MAF sensor can give the same feel as an engine misfire. There is no idle air control sensor. Other symptoms of a bad oxygen sensor include a rough idle, a misfire, and/ or hesitation when trying to accelerate. 96 firebird 3800 v6 multiple misfire Changed the motor in the car starts runs ruff code reader says multiple misfire. Caused by a bad lifter in Cylinder #5, replaced and runs fine. If all this checks good, then another possibility that is not as common is a rocker arm coming loose. The engine may start and idle normally, but lack high speed power. Re: 3. The cylinder 5 misfire code may be because of the cylinder 6 misfire. This is a very common problem and there are alot of threads addressing this very problem. 8 liter 3800 Buick Lesabre rough idle If there is a misfire then chances are fuel could get into the catalytic converter which could cause it to get hotter my previous car before i bought my cts was a 2001 buick regal with 3800 supercharged. I don't know if it's a misfire or notNot sure how else to describe it. a bit andI'll feel a bit of a rough idle but it shortly goes away. duty cycle at about 15# (see 714501. Well, I have been having the same problems that many of us on here are having with an iradic idle, hesitation under load, and sputtering up to like 3000 rpm. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. This is less than 6 percent of the 25 million examples of the V6 installed in GM vehicles between 1975 and 2008. Misfires and a decrease in power, acceleration, and fuel efficiency We have an 88 Buick Park Avenue that has the 3800 motor. (not the common 3800 hesitation) PLEASE HELP Misfire at idle as well as the 3800rpm hesitation. 5K miles and get the oil changed about every 3-4K miles with brand name oil. 8L Ignition Coil Pack. The bike would start at high idle and then slow to a stall. First code was PO305 (missfire #5) and now is PO300 (random missfire). Replacing the ignition coil should solve the misfire issue that's lighting up the check engine light (CEL) on your instrument cluster. If the problem persists more tests needs to be done to Now 2 months later and at 126,000 it began to idle rough again and check engine light came on so I took it back to GM Dealer and was informed that cylinder 7 has misfire and plug was fouled and replaced the plug (oh, and added some oil additive) - feel like I've been here before. Allow the engine to idle or operate within the conditions listed in the Freeze Frame/Failure Records. To perform an OBDII Driving cycle do the following: Cold Start. Cylinder 5 fires right after cylinder 6. Within 3 days it started to idle extremely high, 1700rpms in gear and 2300-2500 in neutral or park. Discuss 3800 overheat in the alt. Welcome to P0420. It was a EGR valve problem. This misfire only occurs Under about 800rpm and immediately goes away once any throttle is given. I'm wondering how to proceed. 178K on the car. 2 ms at idle for SC engine, 3. This will tell you which cylinders are missing. html) I note that the inj. I have a 2000 Suburban 4wd that has a p0300 code. But at greater speeds, it may misfire and drop power since the valves are floating since the springs are weak and unable to continue to keep up using the speed of the valvetrain. autos. Posted on Aug 29, 2009 My 97 firebird 3800 series 2 v6 runs rough idles high 96 firebird 3800 v6 multiple misfire Changed the motor in the car starts runs ruff code reader says multiple misfire. misfire at idle and normal cruising. A complete driving cycle should perform diagnostics on all systems. 8 V6, 98,000 Miles. The engine may well start and idle fine, or run typically up to 3500 to 4000 RPM. ) of unburnt fuel getting into the exhaust but they usually don't cause a shudder at idle. slight hesitation at start,then runs great . 24 worth of repairs to fix the upper intake manifold on his 1998 gm Buick Lesabre & recall all cars listed in gm tech. check engine was on a while ago,scan said #6 misfire,cleared code,has not come back on,yet problem continues. The check engine light came on as well so I put the code scanner on it and got cylinder #1 misfire and cylinder #2 misfire (I believe the codes were P301 and P302). 98 Bonneville w/ 3800 series II #5 Misfire, changed plugs, wires, swapped coils and injector. 1999 Buick Lesabre 3800 Misfire cylinder 1, loud knock, no compression. this truck lived at idle as i was wrong it;s not 1800 idle hours it's 3800 idle hours (think the exact is 3894. 4% to be exact), although the misfire occurred around 3800 rpm at half throttle and about 8# (155 KPa) of boost. He is an HPTuners member on this site. Problem CONDITION POSSIBLE CAUSE CORRECTION 7) Idle cut-off solenoid not working. How do I fix my 2000 Chevy Impala 3. 8L) V6 engine sensor location pictures and descriptions. I was left with the misfire at idle (475-900 RPMS), and deceleration. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. Here is the purge solenoid valve. I finally gave up on trying to fix my 3/4 misfire after years of replacing every sensor, wire, switch, even the ECU, that could be suggested. 8L V6 motor (Jasper rebuild) put in my 2000 Chevy Impala. It has a rough idle and a steady misfire. 3800 miles Carburetor Troubleshooting Guide. GM 3800 (3. 8 (3800) V6 engines. 1990 Gm 3800 in a 1990 olds 98 intermittent rough idle and stall The car has been well maintained and mechanically the engine is very sound (good compression, no oil being burned or ticking/knocking or anything else to indicate the engine is mechanically worn out to me). 8 liter, V6, (3800 series), (Jasper rebuild), misfire? I just had a 3. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a Photo 2: To prevent cylinder misfires at idle speed, some ignition systems fire each spark plug twice, producing a “double-strike” waveform. This engine has about 182k mi on the clock. If no leak are found the next step is to replace the spark plugs. Codes: misfire in cylinder 3 (over and over - only at idle). spark okay. Setting a P0300 code, engine has a little shake to it and scan tool data is showing multiple misfires on #2. What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. The computer can also normally identify the specific cylinder in which the misfire has occurred. 8 liter 3800 Buick Lesabre rough idle If there is a misfire then chances are fuel could get into the catalytic converter which could cause it to get hotter Recently my 96 has been running rough at idle and I hear a faint ticking noise coming from the drivers side. rough idle/ #1 misfire - posted in All Things V6: Hello forum - need help again - 3800 - hesitation/ rough idle; stumbles on acceleration - smoother at rpm's below 2500/ burning rich - increased fuel consumption. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start. Misfire codes for two cylinders that share a coil would likely point to a bad coil. Engine misfires can be caused by a list of faults, but there are a few suspects that occur more than others. Vacuum off manifold is low at 15, with a slight jiggle on the guage. It will usually idle but runs rough. There are other causes(cam timing, etc. See if you can find a scanner that will read rhe engine misfire monitor. The misfires are coming mainly from #2 and #7 cylinders. Rough Idle, misfire and high idling issues That was a 3800 Spray a little water on them when at idle or doing a brake torque. Not enough to trip the check engine light, but I feel that it won't be long until it goes off again. Yesterday on the way to work my 2000 Chevrolet Silverado 1500 4WD with the 4. A lean misfire may trigger a misfire code and turn on the check engine light. An overly lean air-fuel mixture (i. If the engine speed fluctuates enough to cause the Crankshaft Position ( CKP ) sensor signal to vary, the Engine Control Module ( ECM ) can determine that a misfire is occurring. need to know firing order on the engine, coil packs are labeled Posted by kimmy2205 on May 15, 2010 Cylinder 4 misfire. The 2005 Dodge Neon has 29 problems reported for engine runs roughly, misfires. Mon Aug 24, 2015 9:59 pm yeah, i would swap coils and wires. P0171 is a lean code bank 1 and the P0300 is a random misfire. After some research and closer inspection of the vehicle, I'm quite certain I have at least one leaking injector that is flooding a cylinder and causing the car to misfire on a cold start. Misfires and a decrease in power, acceleration, and fuel efficiency A few weeks ago (on 8/15 to be exact), I made a post about sputtering and rough idle. It would start running on half the cylinders and bogged down, with the check engine light flashing, after diagnosing misfires Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. 3800 Multiple Cylinder Misfire - posted in All Things V6: Need some suggestions to solve getting Multiple Cylinder Misfire on a 1997 3800 with about 144,000 miles on it. I note that the inj. A common symptom of a faulty idle control valve can be a high idle. Car idles smoothly, shows 16-17 in/Hg vacuum. Finally got my cold idle misfire issues resolved a few weeks ago, now I have a warm idle misfire. Since an engine needs a richer (more fuel) mixture for a smooth idle, this problem may be more noticeable when the vehicle is idling. Welcome to the Buick Check Engine Light codes page. Backfiring in internal combustion engines occurs outside of the combustion chamber, and is typically the result of an improper air to fuel ratio. The difference is that a sensor supplies information to the engine computer, and the IAC valve is what the computer uses to control idle. 2003 3. There is an idle air control valve. INTENSE™ has dynoed hundreds of 3800-based vehicles, and we understand the areas where the factory PCM is holding us back. com is intended to be a purely technical website for professional, courteous, and intellectual discussion of the 3800 and related applications. took my 2011 rzr s out and about 30 miles into the ride it acted like it was dropping a cylinder at idle and > misfire Reply. So my car is cammed and header car and its misfired for the longest time in idle until you turn the ac on it loads up the engine a bit and smooths out and dosent misfire at all. A failing camshaft position sensor (CMP sensor) can produce a confusing range of problems, depending on the way it fails and the model of the car: An intermittent or complete CMP sensor failure while on the road could be dangerous. Most vehicle owners complain about a rough idle or a misfire when the engine is cold, and as the engine warms up the problem goes away??? But, leaving your check engine light on, with codes PO300, PO171 and PO174. I am guessing that it has something to do with fuel or air. Went out later and Threads Tagged with misfire . Cylinder 4 misfire issue. Cylinder misfires come in many different flavors. . The line feeding into the back of it leads to the upper port on the throttle body(the line on the left in the previous picture) and the other line goes strait to the purge canister, pictured here . Basic Working Theory of the 3. You might just have dirty carburetors because of deposits left in the idle jets and passages as the gasoline evaporates while the motorcycle isn't ridden every day. The only code I had was a P0300 Multiple random misfire that occured off and on at first, Worse in the city Better on Highway. If the problem persists more tests needs to be done to See if you can find a scanner that will read rhe engine misfire monitor. low and rough idle and stalling at complete stops. pontiac grand am. Check engine light came on two weeks ago. Misfires can occur at idle, when the engine is pulling hard under load, at high rpm and during throttle transitions as the air/fuel mixture changes. About a month ago, around 97K miles, I noticed some very sluggish acceleration, especially when driving up hill. 7 to 1] air fuel 4:Poor Idle, Very shaky idle, or no idle at all If you want to check your EGR manually you sometimes can, however the EGR is only meant to be opened under normal operation temperature in excess of 2300-2500 RPMs , so unless you meet these conditions it is not a good way to manually check the plunger valve for movment . , that only affect the efficiency of the spark, but the Look for a high engine idle. Tech notes The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. I had a bad intermittent misfire during acceleration when I first got it, so I replaced the plugs and wires, and for the most part the acceleration misfire disappeared. Rough idle, hesitation on tip in. A fuel injector, on your 3. The bottom line is that we now have the ability to make adjustments to hundreds of parameters within the PCM. Rough Idle, Code for EGR and 0300 Misfire. Ran codes and got a P0303 cylinder 3 misfire. First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where engine speed suddenly (or slowly) changes. 3800Pro. I have even seen PCM updates fix a rough idling condition as well. (thinking EGR tube is cracked). Bad Misfire At Idle - P1352 If this is your first visit, be sure to check out the FAQ by clicking the link above. Monitor all of the misfire counters with the scan tool. Injector pulse width will be longer than expected (significantly longer than 2. The cause of the misfire can be in any one of the following systems: Ignition System : In a nutshell, the ignition system on the GM 3. You've just inherited the "Patron Saint of Automotive Lost Causes" from me. I don't have a 3800 but the slightly high idle without vacuum leak and occasional idle oscillation into a stall makes me think of the TPS. I have a 2003 Buick Regal LS (3800 V6, no supercharger) with 98. If the misfire moves to the new cylinders, the problem is the coil. in. The 3800 uses a georotor oil pump. Service bulletin # 01-06-01-007a. Suburban :: 2000 4WD - Code P0300 Misfire Only Occur At Idle Jan 5, 2012. P0300 misfire (misfire counter shows 1- 1614; 4 - 2253; 6- 1243) I'm getting spark on all coil towers. e. Thread / Thread Starter. Intermittent ignition misfires can be caused by faulty spark plugs, spark plug wires, ignition coils and ignition coil drivers located in the ECM. Ah Grasshopper, I feel your pain. It started with periodic misfires but no codes then finally tripped the Multiple Cylinder Misfire Code. I have replaced the fuel pump relay, fuel pump and check valve. (Page 1 of 2) At 70 k miles the engine began to rough idle and 1991 Buick Regal, 3800 V6 Having a rough idle on a cold start. Im working on a family members 1995 cutlass supreme with the 3. We are a community founded by enthusiasts, for enthusiasts. The cylinder can miss a stroke, causing immediate engine power loss and a noticeable sound effect. As it warms up, it starts to "hunt" between BLM cell 16 and 00, and immediately it runs bad as soon as it jumps to cell 00. The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. process of elimination, get that stuff out of the way right off the bat. 2001 Pontiac Grand Prix GT 3800. A few hundred miles back it started a strange misfire under load and I was wondering if any of you have had this problem. You can drive it sometimes and it will run perfect and you can drive it sometimes and it will misfire. hi I have a 1997 Olds LSS w/3800 "K" . it all started when a coolant hose busted and sprayed my opti. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a "misfire". ^ cyl. Are any of the current misfire counters incrementing? The ramdom misfire code is one thing, however, when your check engine light flashes, that means that many cylinders are doing it at the same time. A rough idle upon starting the engine (that is, when the engine is cold) and sometimes at a stop light or while looking for a spot in a parking lot (that is, at low engine speeds in a warmed-up engine). Put a scanner on the car and I got the following codes: P0171, system bank 1 lean, and code P0300, random misfire. Misfire is an ignition problem logged when the computer doesn't get a confirmation of coil field collapse from the ignition module or when the WELCOME & TABLE OF CONTENTS (updated 9/5/18) (Click on "Continue Reading" to see the full test) This is a Library of tips, techniques and advice for servicing your GM 3800 engine and car. Recently we completed a round trip from Dallas to Des Moines and back, and after the last fill-up in Oklahoma the car developed what feels like a misfire condition. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc. If a noise is present, it will not be eliminated by cancelling fuel injectors and generally, the static compression and cylinder leakage will be similar on all cylinders. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. was a bad cam and it would be $3,800 for a A misfire may occur when your engine is idling, causing a rough or uneven idle. Ruled out: Plugs, wires, and coils are fine. The codes only show up when the car is cold, but the rough idle remains even when warm. I take ABSOLUTELY ZERO CREDIT for the length of material you're about to read, however I have made a few comments in-text that you can see which I will highlight in green. An idle air control valve is, in a very real way, the predecessor to the drive-by-wire throttle systems commonly employed today. You may have to register before you can post: click the register link above to proceed. Keep in mind, however, that these issues can also have other causes that have no relation to the health of a vehicle’s oxygen sensors. 3800 V6 Engine Sensor Locations. Sometimes only 1 cylinder will fail, sometimes more, and sometimes it will jump around. They all have the GM 3. Fixed the wire at the coil, and tried to start the bike again with the same result. It did start the rough idle again not as bad as before the OX, and it also started having hesitation when starting off and random shudder at highway speeds. I am having a misfire issue I pulled my coolant tank off of the firewall and forgot to plug a hose and it leaked coolant all over the engine, so I pulled the coil packs and the plugs and dried everything off but I am still getting a misfire and very rough idle. Buick Mechanic: Pete, Buick Technician replied 8 years ago ok,one of the most common causes for hesitation and rough idle quality is a dirty or 3800 Series II rough idle and dies When you start it at both cold or hot operating temps it will immediately start to surge with the RPMs varing from about 300-800ish range and will die in about 10 seconds if you don't give it some gas. Lol and just to be clear this is just on the 3100 and not applicable to the 3800 low and rough idle and stalling at complete stops. At idle, it runs fine in BLM cell 16, with BLM's and Fuel trim about as expected. Page 1 of 5: How to Test Ignition Coil Pack -Misfire Troubleshooting Tests (GM 3. but if I step into it the motor seems to run pretty good? Gas Recirculation Valve (egr Valve) problem of the 1998 Buick Lesabre 25 Fax fm andrew hunt (NJ) request assistance in getting reimbursed for $561. I then put it in P and gave part throttle to get the RPM's up to 3000 - no audible misfires, backfires or sputtering. Mechanic's Assistant: Have you seen the misfire code before? Has the car been stalling? No Stalls . my car misses at idle and when im just cruising. The problem is its Misfiring at idle on cylinder #2 AT IDLE ONLY. 8-liter with an automatic. 3800 hesitation and fuel cut at the same time? wtfff. At first, you may suspect low fuel pressure or a plugged fuel filter (which can cause similar symptoms). Troubleshooting can lead you to the fuel injectors needing to be cleaned, if an engine is experiencing any of the classic symptoms of dirty injectors, such as lean misfire, rough idle, hesitation and stumbling on light acceleration, a loss of power, and higher hydrocarbon (HC) and carbon monoxide (CO) emissions. Until I decided to install another set of NGK Iridiums, there never was a single instance of misfire. 8L). when I drive it feels like it wants to kick in and run fine for a second but then goes back to the rough driving. I guess I need to go get a bit or something. The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles. Page 1 of 2 ran good. 8L V6 consists of three ignition coil packs, an ignition control module, spark plugs, and spark plug wires. com, the place dedicated to that DTC (diagnostic trouble code) P0420. Since then, it has become worse, and now there is the additional symptom of a STRONG fuel odor. When the car is at idle (stopped) or when slowing down, the engine surges and then dies. my car wouldnt run. A complete driving cycle can be done in under fifteen minutes. Combined with the oil pressure relief valve my experience is that they vary very little when warmed up (typ 41-43 psi at idle and 48-52 psi at 2000 rpm (GM spec for the "C" engine is 40 psi at 1875 rpm). I had ssame problem with that cylinder misfires, rough idle. I would check for vacuum leaks on the drivers side of the engine. Ignition Timing for Modified Engines An often neglected but important area when tuning an engine is the ignition system. So far I have replaced the dist. need to know firing order on the engine, coil packs are labeled Posted by kimmy2205 on May 15, 2010 2003 3. My check engine light is basically always on, but never in the 240,000 mile life of the car have I ever felt any hesitation, missing, anything. Below you will find the most complete list of Buick trouble codes available. Swapped in new plugs and wires (no 2 or 4 [i forget] was singed at contact to plug). Average repair cost is $1,170 at 75,650 miles. It was not as bad but then it got a little worse. Re: Hard starts when hot, rough idle, and random misfire. About a 2 years ago and 20k miles ago, developed erratic miss, mostly at idle but also irregularly apparent at speed under low load. Not like a crazy vibration but enough you can feel it while sitting at a stoplight. P0303 Cylinder #3 Misfire Technical Description. The shop manual has a fairly simple test procedure for checking your fuel pressure at idle, but in order to rule out low fuel pressure as the culprit in your specific situation, you'll need to reproduce the hesitation. Thanks bushy409, 600$ later I have replaced the injectors and now its running smooth and passes inspection. Rough idling can also be caused by bad motor mounts, an engine misfire, incorrect ignition or valve timing of even bad tune up parts. A bad electric sensor can only occur on a car with a fuel injection system. Sometimes the problem is as simple as cleaning an electrical connector. 8L) has been setting the cel the last couple of weeks and now has a misfire on cold starts. The vehicle was also missing with heavy shuddering regal, rough idle. THE SYMPTOMS: poor idle, part throttle stumble, full throttle stumble, popping noises, solid illumniated "service engine soon" light, flashing "service engine soon" light, lack of power, backfiring THE CONDITION: a misfire! Engine Stalls, Misfire Code, & Cylinder Misfire The engine may be stalling because it isn’t getting enough throttle opening. car runs great at idle or full throttle but cruising at hiway speeds it misfires (kinda like spark scatter) low backfire in the exhaust aswell. Thread starter 1999__sabre; until he let it idle for a minute and then took it on the street. 1997 Pontiac Grand Prix 3800 series II not supercharged misfire at idle. david95. Rough idle/unsteady misfire/hesitation. One, to consistently control the engine fueling to maintain a stoichiometric [or 14. benzworld. Engine Stalls, Misfire Code, & Cylinder Misfire The engine may be stalling because it isn’t getting enough throttle opening. Learn about this problem, why it occurs, and how to fix it. EGR Valve Throttle Body Mass Airflow Sensor (MAF) Idle Air Control Motor (IAC) Coolant temperature sensor Fuel Pressure Regulator Throttle… First we will talk about a rough idle. Buick LeSabre Engine Stalling Due to Mass Air Flow/Crankshaft Position Sensor Failure - 238 reports. Idle Issues (1990 Buick Electra Park Avenue 3. After new plugs, plug wires, and cleaning the injectors. I changed plugs, wires, all that stuff. At idle, its got a rough idle and engine vibration. I read it and it was a P0300 Random/Multiple Misfire. org/forums/w203-c-class/1703200-2001-c240-misfire-3800-rpm-only. 2000 Buick Fast Idle was created by propcop Fast Idle Problem Having a problem with my 2000 Buick Lesabre 3. 8L V6 GM vehicle (Buick, Chevrolet, Oldsmobile, Pontiac) can stop working and cause a Rough Idle and/or Misfire Condition if it doesn't get power (12 Volts) or its injector pulse signal from the PCM. all spark plugs ,wires,rotor,cap,fuel filter ect. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily! Within 3 days it started to idle extremely high, 1700rpms in gear and 2300-2500 in neutral or park. No, it runs fine, starts fine, has never died on me, it just vibrates when idling, the idle jumps around, and sounds bad, and under heavy rpm I get decent power, it just doesn't sound and feel quite right. Found misfire counts all over the place so started to look at ignition,plugs and wires. Misfire at low Rpm I then decided to adjust my fuel pressure to give more fuel and at first that seemed to help. The primary villains are simple – spark or fuel – usually manifesting in spark plugs, plug wires, the coil(s) or the fuel-delivery system. 8 liter 3800 Buick Lesabre rough idle If there is a misfire then chances are fuel could get into the catalytic converter which could cause it to get hotter I just finished the intake manifold and gaskets replacement for my mother, and now the car has a random multiple cylinder misfire under load. This will usually cause a bad one to break down. We have a 2002 Buick LeSabre Limited 3. Engine Shuddering At Idle And Low Speeds. Like the small block Chevy V8, this engine has undergone many changes over the years to keep it abreast of changing consumer expectations and emissions regulations. Engine misfires cause a check engine light and code P0300 and others. In this article, we'll discuss engine idle issues, surging and "hunting" problems. cap and rotor, plugs and wires, the IAC, and the #1 and #2 injectors. How to Fix a Misfire Easy step by step guide on how to troubleshoot and repair an automotive engine cylinder misfire P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308, though appearances may vary, the process is similar for most vehicles. First time my daughter Full Answer. This is a first check if you have a GM vehicle with a 3800 engine that occasionally stalls. like an engine misfire, how old are the plugs and wires? to adjust air gap on mine is a 92 with 3800 I replace so many Misfire codes for two cylinders that share a coil would likely point to a bad coil. 2003 impala LS misfire! Rough idle. I changed the coil pack, wires and spark plugs. The mechanic's graphing diagnostic machine cannot find the problem. We are getting codes P0300,P0302, P0304,P0306. I have a 2003 impala LS with 3800 II it has been idling rough I was getting a P0300 random missfire so I changed plugs, wires and Check spark plug wires for and spark plugs that may be worn and causing idle misfire. I would buy them at about 105K miles for around $4500 and then drive them for 100K miles and the sell them to someone else in my family and for $2000 and then buy another “new” one with 100K miles. As I turned on the truck to head to work about just a few minutes ago, the idle was still a little bouncy. Same-o same-o A cheapy code reader and a 6 grand Snap On reader both say the same, misfire #5 Question: I recently developed a disturbing problem with our car. I cannot guarantee against The problem is its Misfiring at idle on cylinder #2 AT IDLE ONLY. 20+ MPG all the time around town. A few misfires are to be expected under these conditions, and should cause no major performance problems or significant increase in emissions. I did some more research and replaced the IAC (Purchased from the Reatta Store ). The Buick 231 cu. - - 2001 C240 Misfire @ 3800+ RPM only in drive (https://www. Start the engine and look at the tachometer on the dashboard. 5-10x a week an individual posts about having a misfire issue (MAINLY BECAUSE OF THE INABILITY TO USE THE SEARCH FEATURE!!!). I have a 2000 Impala with a 3800 V6 series 2 with 165,000 miles. 7) Check idle solenoid, especially for power/ground, replace solenoid if necessary. 2003 Buick Regal 3800 Engine. Car runs fine for the first 8-10 min (probably until it reaches a closed loop state) then it begins to misfire or hesitate when accelerating and run rough when idling. Buick Check Engine Light Codes. If it is not registering a value consistent with closed throttle range at idle it will cause many if not all of those symptoms particularly high idle rpm, fluctuation and stall. 3800 misfire at idle