Gm 3800 rough idle. Idle is perfect at 800 RPM once it warms up. 3) Vacuum Leak. Dec 25, 2016 · GM buick lasabre: 2000 Buick la sabre with over 200k 0n 3. Mar 2, 2023 · 3. 2003 3. Feb 6, 2016. And you can really smell gas after starting and after turning car off. The injectors are spraying contant at idle. The IAC valve controls the amount of air the bypasses the throttle plate, and is used to control the idle speed of the engine. #3 · Jul 27, 2011. Fuel Injectors: Dirty or clogged fuel injectors can disrupt the fuel-air mixture, causing rough running. By Ed Sunkin. Having a problem with my 2000 Buick Lesabre 3. Veh started running rough and unable to idle. I seem to be getting a vacuum leak from somewhere around the throttle body. Consider having the fuel injectors MEMBER. Checked the fuel pressure (stays steady at 43, disconnect the vaccume hose and goes to just about 5 read more Apr 17, 2007 · Randall. If the tachometer is rock steady, and the shaking seems worse out of gear than in gear, it indicates a bad motor mount. so i checked all the wires going back to the o2 sensor and sure enough the heat sheld had hit the wires for the sensor and Dec 10, 2008 · This code relates to an electrical failure, not a mechanical failure, so a stuck or dirty injector isn't your problem. CA. P0300, P0301, P0303, P0305 (Misfires on bank 1, cylinders 1-3-5) P0342, P0368 (Camshaft A and B on Bank 1) P0102 (MAF A Circuit Low) Before all of this, I was throwing This car has the 3800 engine. AUTOMATIC. But that did not change anything. The problem is its Misfiring at idle on cylinder #2 AT IDLE ONLY. Oct 18, 2009 · This article will show you how to test and diagnose a bad GM mass air flow (MAF) sensor on all of the early 90 thru' mid 90's Buick, Olds, Pontiac 3. It has 104,000 miles and normally runs very well with great gas mileage. Setting a P0300 code, engine has a little shake to it and scan tool data is showing multiple misfires on #2. then add SEAFOAM to gas every 3000 miles to keep lines. 2009 enclave 131k. to/c/229/B/throttle-body-assemblyIf your vehicle is experiencing weak acceleration, or rough idle, one of t Apr 3, 2023 · 350 Tbi rough idle overfueling. Sep 5, 2009 · I have a 1992 Buick Park Avenue 3800. 8 V6, 98,000 Miles. so i scaned it and it came up a 102 and 125. The desired RPM is based on sensor inputs and the actual engine RPM. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a Jun 29, 2023 · As a cost-cutting measure, GM effectively sliced a pair of cylinders from the end of the original engine while retaining the 90-degree bank angle. Aug 30, 2019 · Fuel injectors are responsible for delivering fuel to the engine, and a dirty fuel injector can cause problems such as a rough idle. Rough idle only during engine warm up cycle. As you may suspect, a faulty fuel injection caused by a poor MAF sensor can also make your acceleration rough or jerky. Dirt, grime, and other contaminants can build up in the fuel system over time, leading to clogged or blocked fuel injectors. The engine was based on an earlier 198 cu. Sitting at idle, starts running rough. Not open for further replies. So far I have changed the following: spark plugs (acdelco), spark plug wires (acdelco), PCV, idle air control valve May 15, 2016 · The problem I am having is a high rpm. This misfire only occurs Under about 800rpm Feb 28, 2023 · Your LaCrosse’s engine needs air, fuel, and spark to achieve optimum ignition . Cleaning or replacing the IAC valve might help. It will correct itself after about 5 seconds, can usually correct it a little quicker by revving. 2-liters a rough, rumbly idle. Consistent. Has not actually died, but runs rough. Jan 24, 2013. You may also notice fluctuating idle speed or a stalling engine on idle when your IAC valve is bad. car ran out of gas a few weeks ago and now when it is idleing it is very rough and acts like it wants to stall. 8L 3800 Series 1) Help us help you. Aug 3, 2015 · The vehicle is a 1998 Buick Park Avenue with a 3800 Series 2. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop. Just recently when the engine is started cold the engine idle will immediately go to 1400 and stay Apr 24, 2014 · 3. The first Buick 3. engine,fuel pump Apr 9, 2008 · The Buick 231 cu. It has 128K, experiencing a really rough idle condition (shuddering, shaking) when the car warms up. It idles rough. 8 liter 3800 Buick Lesabre rough idle. This is usually because the air-fuel mixture becomes too lean, so the car engine “starves” due to a lack of food, and this will cause it to jerk. Upon starting, it is at about 1200 rpm rapidlly drops to about 300 rpm and levels out at 1000 rpm. When you turn the key it will sometimes fire right away and then die or you’ll have to turn it over for a few seconds. Hey Randall, You should have a MAF Sensor (Mass Air Flow Sensor) on your vehicle. Mar 15, 2018 · Idle Issues (1990 Buick Electra Park Avenue 3. 1. I replaced stuff (kept old stuff too) that didnt seem to be Aug 31, 2019 · Fuel injectors are responsible for delivering fuel to the engine, and a dirty fuel injector can cause problems such as a rough idle. Shop for New Auto Parts at 1AAuto. last time i had a rough idle i just check my fuses and one was a little loose so i pushed it in all the way and it fixed the problem, but now my service engine soon light came on. 5) Dirty Fuel Injector. 8 engine. Alright men talk to me, I have a 3500 8. Car runs great and gets 30 mpg. This morning when I started it the engine light came on and it idles rough then smooths out. May 26, 2011 · 4 posts · Joined 2010. Here is a more detailed list of the signs of a bad or failing idle air control valve (IAC) to look for: 1. 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. General Motors used the 3. Also cleaned the Idle Air Control pintle and seat. My '98 Lumina 3. The car ran fine yesterday. 8L v6. 20+ MPG all the time around town. A faulty ECT sensor is one of the most common sources of rough idle on a cold engine. Posted on Aug 29, 2009. Maintenance/Repairs. If you need to just clean the MAF sensor, you can find this article here: Cleaning The MAF Sensor (at: troubleshootmyvehicle. 8 2000 Buick la sabre with over 200k 0n 3. Yesterday the check engine light came on when I was driving it, but the car ran great. Reasons for a Rough Idle or High RPM. When in gear its still between 1200-1500rpm. Mar 5, 2014 · My car is a 1995 Buick Regal Gran Sport with the 3800 series motor with 212000 miles. Aug 27, 2023 · 6. Dec 11, 2016 · Easy fix. Sep 10, 2023 · A rough idle when the air conditioning is on may be caused by: A faulty or dirty IAC valve. If it will start and run a while you need replace the MAF sensor. A fuel pressure regulator costs $30 to $200, and the average labor cost is $50 to $300. Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor Aug 28, 2017 · 140 posts · Joined 2017. no CELS. Hesitation, rough or jerky acceleration. Sep 14, 2022 · Did not drive for 2-3 months, but was on trickle charger and would start it every 2-3 weeks and idle up to operating temp of 175, then shut off. The rough idle tarted after driving through some muddy and wet roads go the cheapest route. Also replaced the upper plenum with a new Dorman one. Jul 12, 2011 · AfterShock. When one or more of these variables is off, it can lead to a rough idling condition. Check spark plug wires for and spark plugs that may be worn and causing idle misfire. Only as needed repairs. Check all vacuum lines for leaks. SOURCE: ENGINE IDLES ROUGH, BUT RUNS FINE WHILE DRIVING. The problem occurs under all conditions, cold start, hot start, weather doesn’t play a factor. 4. Depending upon where the leak is it will either cause a rough idle or not. Common sources of dirt in the fuel system include old fuel, dust, and dirt. 1L, 3. when I start it the rpms go past 2k and then drop to 1100 within a few minutes its idling at 2000-2200. I drained the oil to the proper level and changed out the two fouled spark plugs and it instantly got better. I had the gas tank, fuel pump, filter and oil changed last week. Open means infinite resistance like an unplugged injector, poor electrical contact, broken wire, or faulty PCM. . Motor is running with CCC. Idle Air Control (IAC) Valve: The IAC valve controls the engine's idle speed. I would unplug the electrical connector to it and try restarting the engine with it unplugged. 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. 1 3500 intermittent #7 misfire and rough idle cold start. It comprises a plunger that fits within a bore of the throttle body, and a stepper motor that moves the plunger. Apr 10, 2016 · 1,255. The following sections let you explore the most common causes. Check Engine Light. I have a 95 Buick Lesabre 3800 engine, with 89,000 miles on it. Note: Most rough idle in Drive concerns are temperature dependent and can be difficult to re-create at times. Kept starting then immediately cut off. Although you won't see this often, an engine rough idle can be a sign of problems with the fuel pump or fuel pressure regulator. The GM 3800 Series II engine, introduced in 1995, is quite a different engine from its predecessor, the Series I engine. Oct 19, 2007 · I have a 2001 Firebird with the 3800 v-6 with 50k on it. Dealing with a random misfire OBDII code of code P0300,and having bad misfires with the 3800 engine,I put new parts everywhere that did not solve the problem. You can hear a hissing, and when I hit the gas, it whistles, and Mar 25, 2022 · Buy Now!New Idle Air Control Valve from 1AAuto. Scanned obd and got po300, po301, po303, po305 as pending codes three days ago. Location. BUICK LESABRE. 8 in my 84 Regal. using throttle body cleaner and removing the IAC and then clean the parts will help idle issues. Too much of either can result in severe running issues. Dec 16, 2020 · My 1993 Buick LeSabre 3800 seems to have one or more leaky fuel injectors. One of the most common causes of rough idle on a cold engine is a faulty ECT sensor. Feb 11, 2011 · What sucks, is that so many things can cause a misfire condition (or a rough idle condition). When your engine idles rough and the exhaust has the smell of raw, unburned gasoline, it is suffering from a rich condition or or Nov 21, 2009 · Circuit Description. During idle, especially when fully warmed up, it idles chuggy, like extra rich or flooding. Has all compnents except I removed the EFE grid under the carb. A dirty throttle body. 3L and 3. You'll need an ohmmeter and either a 'noid' light, test light or P194 bulb. Got ready to pull the BCM and PCM and guess what I found? Jul 4, 2016 · GM 3800 Service Tips, Techniques, and Advice. Though the V-8 enjoyed the balance of an even firing interval, the V-6 version had an odd firing interval that gave these early 3. May 28, 2014 · 2 Answers. Jul 10, 2023 · This will result in a rough idle and a smell of gas in the exhaust. The check engine light came on throwing code p0305 which is a misfire in cylinder 5. Fuel – The ideal air-to-fuel ratio is 14. 8L V6 consists of three ignition coil packs, an ignition control module, spark plugs, and spark plug wires. No weird smells. O-ring Gaskets Gone Bad. Hello all I have a 2009 Silverado 1500 LT 5. But if I rev to 2000 rpm before shut off, it restarts better. 4) Carburetor Issues. Oct 29, 2017. 2. New fuel pump last month. Manifold air intake boot was cracked, we replaced that hoping engine was getting to much air. In order to increase the idle RPM, the control module will Feb 12, 2023 · The most common symptoms of a bad idle control valve are rough idle and a check engine light on your dashboard. park and having a rough idle and the MAF sensor is unplugged it goes back to normal with no issues Jun 22, 2015 · -I have gotten a few codes, two for random misfires and one for "bank 1 running too lean". 11. Jan 6, 2021 · 2005 buick lasabre ,3800 engine, runs rough at idle, runs smooth at 1500 rpm. Air – The air entering your car’s engine must be metered by the MAF or MAP sensor. New plugs, plug wires, new - Answered by a verified Buick Mechanic Mar 3, 2013 · Have a 2005 Impala 3800 Police with 120K. This sensor signals the car's computer when the engine's coolant is cold or hot, so Other Symptoms: Poor engine performance when cold or as it reaches operating temperature, hard starting, poor acceleration, rich fuel mixture at idle and stalling. At about 1200 RPM the engine runs fine, anything under that and it runs rough, sputters like its about to choke. Quick Note: Finding Intake Vacuum Leaks, Check List: Signs of a vacuum leak are: rough idle, misfires, high idle RPM, long term fuel trim above 8 (it should be between -5 and +5 at warmed up idle), DTC code P0171. Throttle-body fuel injection arrived in 1984 and a multiport fuel injection system became available in 1986. buick, parkavenue. it will cruise down the road at 40-45mph without touching the throttle. 1L Gas it has 85,000 miles I’ve changed the spark plug, wires, coils, injectors, motor mounts, air filter, cleaned MAF sensor, had the engine scoped and checked multiple times the mechanic can’t find an issue with it. Campbellsville, KY. Four circuits are used in order to control the IAC valve, allowing a precise amount of air into the intake manifold. However, if you choose to replace it yourself instead of having a mechanic do it, you can save Sep 17, 2019 · I was driving 55MPH the other day when I lost all power and check engine light started flashing. Even out of preventive maint. If it's malfunctioning or dirty, it can lead to rough idling during cold starts. 3. Engine Timing. 2) Bad Ignition Coils/Wires. FWD. Oct 1, 2007 · or so it back to the very rough idle again. the rough idle vibration concern. 4" (86 mm), and the bore remained at 3. Bought new plugs and will be putting those in tonight. The car idles alright, but if you give it gas it will idle too low, boost RPMS trying to live, and repeat until it stalls. So, a few months ago my wife and I spent a bunch of money getting our car through inspection (including putting a new cat convertor on it) and shortly after getting through inspection the "service engine soon" light came on. I did both my valve cover gaskets and both upper and lower intake manifold gaskets on a 3800 Series II GM V6 engine. This is definitely not a normal situation. jiminvegas February 19, 2014, 9:30am 1. It seems to get close to stalling out at stop lights, but it hasn't happened just yet. Apr 17, 2013 · Fast Idle Problem. And when it does start it generally runs rough until the water pump circulates some cooler coolant and brings the temp back down. Pull away from stop light and smooths out. Fuel Pump. 8 running rough only at idle. With A/C On, perform several short heavy launch events from stop to stop to bring the temperatures back up while attempting to re-create the rough idle vibration in Drive with Pico sensor placed on 2003 3. Depending upon where the leak is it will either cause a rough idle or Jul 4, 2016 · GM 3800 Service Tips, Techniques, and Advice. 8-liter V-6 for rear-wheel-drive cars, but it developed a variant of the 3. replaced parts are as follows. The check engine Aug 3, 2012 · Hi there I'm hoping somebody here could help me with the issue I'm having on my 85 Buick Century. Changed the PCV valve and that fixed the problem Jul 12, 2006 · Posted July 12, 2006. 3 with 93K and she's been acting up the last couple of weeks. About 10 days ago wife reported rough idle at start up and some occasions it would stall. Signs of a vacuum leak are: rough idle, misfires, high idle RPM, long term fuel trim above 8 (it should be between -5 and +5 at warmed up idle), DTC code P0171. While the stroke for the 3. It can sometimes be difficult to start when I shut it off and wait a few minutes for the engine temp to climb. 3 and noticed that idle was surging between 400-600. 1L has 120,000 but was running good, has always had basic up keep (plugs, oil changes etc. Jun 21, 2009 · I have a 1998 Buick Regal LS w/ 3800 Series II engine. The average fuel pressure regulator replacement cost is between $80 and $500, depending on the car model and labor costs. As soon as I was able to pull off to the shoulder, I checked codes immediately. ALL NEW. 8 for 1984-to-1988 front wheel-drive cars. Sometimes playing with throttle, or shutting down and restarting will resolve it to some degree. I think this should apply to any V6 GM makesdepending on select years. to/ia/1AISC00044The idle air control valve keeps your vehicle's engine idling when the throttl Apr 25, 2016 · GM 3800 Service Tips, Techniques, and Advice. #1 · Aug 28, 2017. com http://1aau. 1) Bad Spark Plugs. I replaced camshaft position sensor, crankshaft position sensor, ignition control module, and fuel pump, still did the same thing after each replacement part. 8L V6 engine has had a production run lasting more than 30 years. I have a similar problem with my 2003 Impala and the dealer cannot recreate the problem nor find anything wrong. #1. Sep 9, 2019 · An engine misfire is the most common cause of a shaking idle, and as the engine stumbles and misfires, it should be noticeable on the tachometer as a drop in RPM. Mecum Mar 1, 2014 · Rough Idle/ Service Stabilitrak/ Service Traction Control. 7 parts air to one part fuel. The internal combustion engine requires a precise mixture of fuel and air to run correctly. in. If I shut it off during idle, it seems flooded if I restart. ) But never anything like new valve spring job or anything like that. Recently I have noticed that after using the car for awhile and letting it set for 15-30 minutes or so, it does not start on the first turn of the ignition switch and if it does the engine stumbles and runs rough until I increase the rpm's. #13 · Dec 24, 2012. Jan 21, 2022 · 8. The car drove fine, and having JUST put a bunch of money into it I ignored Apr 2, 2013 · I have a 95 Riviera S/C - 3800 Series I. com ). 120,000 MILES. 1L. #7. 8L engine remained at 3. The PCM uses the engines RPM and MAP sensor values to Feb 17, 2020 · TBI 350 Intermittent rough idle/near stall taken out of gear SOLVED (kinda) 1991 K5 TBI 350 with SM465. replace fuel filter and add SEAFOAM to tank of premiun fuel. 8L Impala - intermittent rough idle. Just a wore out vacuum line. Feb 6, 2016 · 11. The control module controls idle speed with an idle air control (IAC) valve. A Long Note on: Troubleshooting Misfires Misfires cause the engine to lose power, run rough, and produce a foul smelling exhaust. July 4, 2016 ·. '03 Buick LeSabre, 3800 V6, 43K miles: after being warm for a while, but not necessarily running constinuously, the idle starts coming up and can go above 2,000 RPM in park if given long enough. 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. 1 post · Joined 2011. idle is a little rough but when you put it in drive it really shutters and wants to stall out. HI, I recently installed a rebuilt 350 into my c1500 and the truck runs but it's exhaust reeks of gas and is smokey. Author's own image. May 20, 2015 · 1998 CHEVROLET LUMINA. You can buy an inexpensive rebuilt unit from your local auto parts store, rather than a more Slightly Rough and Erratic Idle in the Stock 3800 Engine (Preliminary post) This seems to be a problem of all stock 3800 engines, even after doing a complete tune up (new plugs, new wires, new coil Feb 13, 2013 · If its cold out use a hair dryer to evap the solvent before starting. New issue: Starts fine, runs well until first Stop light or two. 8L was offered in the 1975 model year Skyhawk, Apollo, Century and Regal. replace filter before 500 miles. I have to throttle it and clear the excess fuel. One out of five times the idle will seem to fall out when taking it out of gear and coming to a stop. Hey guys, I'm having a problem with the 3. Other faulty systems or components, depending on the model. 2,445. A faulty cooling or condenser fan. -I have checked fuel pressure, it holds steady at 48-50PSI(OE recommended 45-55) -The MAF sensor looks like this, and has been PCV valve failed caused the engine to suck air and made engine shack. I can feel the injectors clicking. V6 Oct 13, 2004 · I've just finished working on a 2001 buick lesabre with the 3. Jan 21, 2013 · Dec 4, 2011. I found that the oil level was overfilled by about a quart and 2 of the spark plugs were nasty. Purchased the car with a TON of issues and now I cant seem to shake this last one. I bought a used 2010 Silverado 5. Only thing that appears to help is manually pinching egr shut and it idles great but hesitates to rev with it pinched Feb 19, 2014 · 2003 Buick Park Avenue 3800 Series II hard to start. Engine Coolant Temperature (ECT) Sensor. I use a tooth brush and a cloth to clean and wipe out the carbon deposits as much as possible. 8" (97 mm), the engine architecture changed dramatically. Mar 6, 2023 · Fuel Pressure Regulator Replacement Cost. 6 CYL. 8L V6 equipped cars (to be more specific: 89-96). The May 12, 2009 · Second Generation Repairs: Servicing the GM 3800 Series II Engine. It feels like a misfire. The GM 3800 is a common "crate" -- or replacement -- engine for Chevrolets. gc cl kg bx vn gl el ds cu pl