3800 Series 2 Random Misfire

3800 Series 2 Random MisfireL36 also has a good fuel economy. P0301 Cylinder #1. A code P0300 may mean that one or more of the following has happened: Faulty spark plug or wire. P0303 Cylinder #3 Misfire. Some Common Problems in Buick-3800 Engine. ” This diagnostic trouble code (DTC) indicates that your car’s computer has detected an engine misfire that’s random and/or appearing on multiple cylinders. You’ll likely find another OBD-II code—from P0301 to P0308—alongside P0300 as these all point to engine. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open. Start by checking for intake leaks, intake gaskets are a common cause of multi-cylinder misfiring. Code P0300 stands for “Random or Multiple Cylinder Misfire Detected. hope it helps someone in the same boat someday. cleaned MAF sensor, replaced air filter, front 3 plugs and wires (those back ones are tough!), checked & cleaned EGR valve and it was not blocked but i put on new gasket, replaced PCV valve. Remove bolt and camshaft position sensor. It was a P0300, random multiple misfire, took it to the shop they changed the plugs wires and a PVC valve. When an intermittent misfire occurs while driving, first remove the spark plugs and inspect them. continuation of previous video. Also, check the ignition wires. Probably was a Series II 3800. Warm, misfires while accelerating at any speed. Any mis fire codes? It's common for the ignition coils to go bad on those, sometimes even the ignition control module if you have random multi misfire. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring. I have an intermittent P0300 with no other codes. Probably was a Series II 3800. 18K views 8 months ago Overhauling a GM 3800 series 2 engine. Remove water pump pulley attaching bolts, then the serpentine belt and water pump pulley. A while back I found a pretty good step by step tutorial for diagnosing a random misfire on a 3800. The check engine light will be flashing on most cars, and prolong operation of the engine with misfires will destroy the Catalytic converter. I pulled the codes and got a p0300 (random/multiple misfire) and a code for the downstream O2 sensor. They sent me the revised wires at the time and problem solved. 06 Buick Lucerne 3800 P0300 Random Misfire under load 2006 Buick Lucerne CX – 3800 Series 3 V-6 Codes are P0300, P0455, and P0741 This is my daughter's car. Take note of any error codes that pop up to help you as you move forward in diagnosing the problem. ) I replace the ICM with a brand new Delphi unit. Also try swapping the spark plug with another spark plug to see if the misfire moves to another cylinder. (supposed to be 47-55psi on 3800 Series. However, in April, 2009, GM issued a recall on 1. My '02 impala with a 3800 would randomly stall/not start. 2answers Multiple misfires random misfires Do a Cylinder Leak Down Test --to see if the valve are shot & leaking You can also do an electronic cylinder contribution test Then if the all seal, check the timing belt After that check for vacuum leaks with evap smoke machine Read full answer Mar 28, 2014 • 2000 Honda Civic 1helpful 1answer. ” This diagnostic trouble code (DTC) indicates that your car’s computer has detected an engine misfire that’s random and/or. I have a 2000 Impala with a 3800 V6 series 2 with 165,000 miles. Cylinder 9 Misfire Detected P0310. Multiple misfires random misfires Do a Cylinder Leak Down Test --to see if the valve are shot & leaking You can also do an electronic cylinder contribution test Then if the all seal, check the timing belt After that check for vacuum leaks with evap smoke machine Read full answer Mar 28, 2014 • 2000 Honda Civic 1helpful 1answer. I put a 96 3800 series II motor out of a buick in and im getting the random misfire code and occasional backfire (usually in reverse) and exhaust smells like sulfur. Random misfires while driving are frequent with the L36 engines. The 3800 engine uses high-impedance 12 ohm injectors, and the test spec is 11. Because they were random missfires over multiple cylinders, no code was set, but it. 2006 Buick Lucerne CX – 3800 Series 3 V-6. When an intermittent misfire occurs while driving, first remove the spark plugs and inspect them. ' The Service Engine Soon light is sometimes on sometimes off, and rarely blinks. webbch. one way to narrow it down is bring the rpms up to the misfire rpms, use a test light with one end cliped to ground and stick the probe between the boot and the sparkplug wire at the coils, you will hear the rpm change with each cylinder that is not the problem, when the misfire doesnt change you know you found the cylinders in question. Like any other engine, it also exhibits a share of its flaws and problems. Wires with a mileage of 100,000 miles or more can produce high resistance. I had a really bad missfire on my 99 with no codes set. 60-inch gap between these spark plugs. On some of these, the module housing IS the ground. 2006 Buick Lucerne CX – 3800 Series 3 V-6. I know on most cars the downstream sensor is just for emissions, but would that cause these pretty hefty misfires?. P0300 - Random/Multiple Cylinder Misfire Detected When a misfire occurs, engine speed will fluctuate. Recent car purchase, and I am relatively unfamiliar with front wheel drive nuances that may be found with the 3800. I put a 96 3800 series II motor out of a buick in and im getting the random misfire code and occasional backfire (usually in reverse) and exhaust smells like sulfur. Having a hard time with this one. 94 Olds 88 intermitent stall and no start (fixed) was created by stp396 Hi guys. I have just replaced the spark plugs and wires. If a coil pack shorts out it will blow the 15 amp fuse and short out that entire bank. The leak of intake manifold coolant ; An intermittent hesitation or chuggle; During driving intermittent misfire ; Cracking of engine without start; The leak of Intake Manifold Coolant. If no codes, ask yourself if a tune-up is in order, plugs, wires mainly. I have a scan tool that is able to monitor fuel trim values:. I'm working on a friends 94 Olds 88 with the 3800 series 2 engine. During driving intermittent misfire Cracking of engine without start The leak of Intake Manifold Coolant Buick-3800 engine’s coolant leaks particularly in engines of Series II 3800. Get a can of Brake Clean and spray in around the intake manifold on the top of the engine while the engine is running. Generally, the term "misfire" refers to an incomplete combustion process inside the cylinder. Coolant Leaks in the Intake Manifold. P0300 random misfire code set. This started about 3 weeks ago. P0300 - Random/Multiple Cylinder Misfire Detected When a misfire occurs, engine speed will fluctuate. P0306 Cylinder #6 Misfire. If the problem persists more tests need to be done to diagnose the problem, see 'Possible Causes'. I have a Buick PA ultra 3800sc series 2. Checked for vacuum leaks and sealed all connections on the . Thanks for the help! EDIT - just in case anybody looks at this in the. 8L V6, non-supercharged) that is giving us a code which reads 'random cylinder misfire. By Ed Sunkin May 12, 2009 The GM 3800 Series II engine, introduced in 1995, is quite a different engine from its predecessor, the Series I engine. I have a Buick PA ultra 3800sc series 2. I have a 2000 Impala with a 3800 V6 series 2 with 165,000 miles. enslow. The cam sensor will not cause a no start on this (both spark and injector pulse will be there without it) 3. They then told me I needed to replace the catalytic converter. P0300 random misfire code set. ' The Service Engine Soon light is sometimes on sometimes off,. She bought it about 6 weeks ago with 133K miles. Sometimes the tach bounces to 0 rpm. 164,000 MILES Hesitation problem at 2500-3000 rpm cannot get much higher than that when driving, gas mileage has dropped. Customer: 2007 Pontiac 3800 series motor random misfire replace spark plugs wires and MAP sensor was still running really rough should I replace fuel injectors. GM 3800 Service Tips, Techniques, and Advice. I HAVE A Buick 3800 series 2 for months we have had issues with misfires. Thanks for the continued advice Automotive Forum! GTP Dad. P0304 Cylinder #4 Misfire. What causes random cylinder misfire in my 1998 Chevrolet Lumina, 3800 Jay, Chevy Mechanic Chevy Replaced the fuel filter and pcv valve during an oil change. Similarly, its manifold plastic intake has been a trouble for people. It appears the misfires are totally random. Disconnected supercharger belt, no more misfire but won't rev over 2800 rpm, and of course, no power installed new AC iridium plugs & AC wires, fuel pump, fuel filter, fuel pressure regulator, MAF sensor, coil packs, ignition moduleno change. The intake gaskets leaking would cause the engine to have a misfire. Since it is sporadic, I am going to go through the vacuum lines to make certain. It is vulnerable to random misfires, coolant leaks, engine noises, and trouble starting. The car has a 16 pin connector but but apparently is still OBD 1. My big idea right now is a lean misfire caused by a TPS whose range isn't right but that's a total guess. I have the sulfur problem figured out (gas in cat due to misfire) I changed the intake on this motor to adapt it to rear wheel drive. All o2 sensors were replaced as well as a software update from the dealer. Faulty coil (pack) Faulty oxygen sensor. After a few hours it's running on one or two pistons. ” This diagnostic trouble code (DTC) indicates that your car’s computer has detected an engine misfire that’s random and/or appearing on multiple cylinders. onewhocollects 47K views 2 years ago Mystery MISFIRE: 1995 Buick Riviera Supercharged V6! Pine Hollow Auto. A misfire code can be triggered by anything that causes the cylinder not to fire, so a full diagnosis should be run to be 100% sure on what is causing the . I have a Buick PA ultra 3800sc series 2. Diagnostic The gasket manifold intake by OEM tends to weaken after covering 60,000-above miles if it runs in an area where the cylinder head gets seal coolant passage due to the manifold. What Are The 3800 Series 2 Common Problems? 1. 1997 Pontiac Grand Prix 3800 series II not supercharged misfire at idle. 2005 Buick Lacrosse/ 3800 Series Vin 2- Throttle Actuator Issues was created by PK Hi all, I am investigating an issue on a 3800 series GM. I cleared the codes with my Actron CP9190 and only occasionally would the P0301 reappear - that turned out last fall to be a failing Crank Position sensor. Make sure you have the correct gaps on your plugs. 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. Y ER DIE Tricks and trades 92 subscribers Subscribe 150 19K views 3 years ago I couldn't find a super. I am assuming this is a Normally aspirated engine. So far the only code it throws is 0300 (Random Multiple Cylinder Misfire). Keep an eye on the coolant level. I put a scantool on it and found a whole ton of missfires under load. How To Diagnose a P0300 Code (Cylinder Misfire) There are five major things to check when diagnosing P0300: Make sure there are no other codes present (address those codes first) Make sure coil pack connectors are tight Check the condition of the spark plugs Check the fuel pressure Check engine compression. It has over 250,000 miles on it and is a 3800 series 2! I was having a problem with a small misfire when driving it, it would sputter really bad if I pushed the petal to a certain point to far, but still ran fine if it wasn't pushed to that point. Code P0300 stands for “Random or Multiple Cylinder Misfire Detected. This issue in engine-3800, however, can be resolved by replacing the throttle position sensor (TPS). Single cylinder misfires are usually caused by ignition issues (spark plugs or ignition coil or wires) or fuel injectors. I suspected a bad coil or ign module. Disconnect battery ground cable. P0300 for random misfire is probably a more useful code than P0303 for example supposedly points at cylinder 3 misfire, which is rarely correct in my experience. Buick-3800 engine’s coolant leaks particularly in engines of Series II 3800. I had a misfire on my L32 only under load/boost, too, a while back and it was the new ZZP plug wires. started with the mass air flow and that worked a while. also check the fuel pressure regulator. In the last 20K : plugs, wires, fuel filter, fuel press reg. So ill start with the info on my car. My '02 impala with a 3800 would randomly stall/not start. 42 LSD, Full SLP Ram Air Intake, Helix . Engine Cracking Without Starting. I pulled the codes and got a p0300 (random/multiple misfire) and a code for the downstream O2 sensor. Might cost you a pizza or 6 pack if you know the right guys. If the mass air flow or oxygen sensor fails, it could give incorrect data to the engine’s computer, causing a misfire. Check spark plug wires for and spark plugs that may be worn and causing idle misfire. Since it is sporadic, I am going to go through the vacuum lines to make certain something isn't cracked or broken or partially plugged in. Disconnect sensor wiring connector and remove sensor retaining bolt. A while back I found a pretty good step by step tutorial for diagnosing a random misfire on a 3800. Recently, I replaced vacuum hoses and fuel filter. Had the new cat put on at a muffler shop. cleaned MAF sensor, replaced air. Buick-3800 engine’s coolant leaks particularly in engines of Series II 3800. Random misfires while driving are frequent with the L36 engines. On a Series II 3800 engine, fuel pressure should be 48 to 55 psi with the key on and engine off. We have a 1998 Chevrolet Lumina, 3800 Series II motor (3. Cold, runs fine for a few minutes, plenty of power. Cleaned and checked MAF sensor. Once the engine starts the 3x signal is no longer needed. 080” can cause misfires under acceleration, and at high RPM; will usually have no misfires at idle. We have a 1998 Chevrolet Lumina, 3800 Series II motor (3. Beware, the 3800 engine does not like platinum plugs; with these you might get some misfires at high rpm or under acceleration before complete failure. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. If the problem were the ignition module, I'd expect it to cause the other cylinder paired with #4 to misfire, as well. Found this general information on a 3800 info site:. It starts, idles and drives smooth, but the problem is acceleration under load. Some Common Problems in Buick-3800 Engine. They do have an issue with lower intake. I know on most cars the downstream sensor is just for emissions, but would that cause these pretty hefty misfires? Otherwise I’m playing the “chase the misfire” game. Engine Cracking Without Starting:- There can be a variety of causes for no start, but the most common in the Buick-3800 engine is faulty CKP sensors and ICM. In the morning, when cold, (below 40f) The car has a terrible misfire for about 2 or 3 minutes until it warms up. I have a 2000 Impala with a 3800 V6 series 2 with 165,000 miles. 60 ohms, so check the resistance across the injector terminals if you suspect a bad injector. My parents have a 97 buick lasabre with a 3800 series 2 Did it ever misfire bad enough to set a code, or is just rough and visible in the data stream? These cars have a terrible problem with the intake manifold gasket leaking, and also problems with the plastic upper plenum that can cause the issues you are describing. The dual crank sensor (3x and 18') signals. How To Diagnose a P0300 Code (Cylinder Misfire) There are five major things to check when diagnosing P0300: Make sure there are no other codes present. 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. Could be the metal wire covers like his problem, too. The random misfires may be because of worn-out spark plugs or weak coils in your L36. Is there anyone who might have an idea what this might be? Thx Reply Save Like 1 - 20 of 37 Posts 1 2. Twist and pull sensor to remove. Misfires cause the engine to lose power, run rough, and produce a foul smelling exhaust. P0300 Random Cylinder Misfire. The 3x coordinates the 18x signal during cranking. Here are some of the most common symptoms of a misfire condition on your GM 3. I checked for vacuum leaks- nothing found. It can be caused by carbon buildup but not at all rpm's. 8L: The check engine light will be on. 8L - P0300 - Random Cylinder Misfire. 1997 Pontiac Grand Prix 3800 series II not supercharged misfire at idle. Replied by ScannerDanner on topic 1994 Olds 88 intermitent stall and no start. It has a flashing CEL under hard acceleration and a lack of power. The guys are working to remove the blown 3800 series 2, waiting for the used one to arrive. Caused by a bad lifter in Cylinder #5, replaced and runs fine. I've seen ads in auto parts stores for aftermarket ones claiming to be better than stock, might be worth looking into for others finding this in the future. Fix Therefore, you may need to remove and check the spark plug. My 97 firebird 3800 series 2 v6 runs rough idles very high in park and has no power and wont stay running Check all vacuum lines for leaks. in a 1996 Buick Regal Custom V6 3800 Series II? It's not the computer, that's brand new. 8L) At the end of the day my car needed a CASE relearn. Causes: - Improper spark plug. If you are getting misfire codes, first, off, COMPLETELY disregard the cylinder number of the code. If you have a cylinder misfire, but have a good spark and compression, the fuel injector is probably clogged or dead. I bought my '97 LeSabre in August of 2012 with 97,500 miles on it and it had only a few codes set, P0301 random misfire and P0171 Lean to Bank 1. The theory is maybe the PCM is getting data it can't quite understand and having a problem with fuel enrichment, the TPS is also used to help determine when to shift and when to apply the TCC. Intermittent misfire happens while driving due to a worn spark plug or a weak coil. 8L V6, non-supercharged) that is giving us a code which reads 'random cylinder misfire. Intermittent Misfire While Driving:- The intermittent misfiring is caused while driving due to a worn spark plug or a weak coil. If you have misfires on all cylinders, it can be a vacuum leak anywhere around the intake manifold. Disconnected supercharger belt, no more misfire but won't rev over 2800 rpm, and of course, no power installed new AC iridium plugs & AC wires, fuel pump, fuel filter, fuel pressure regulator, MAF sensor, coil packs, ignition moduleno change. 5 million vehicles with this engine due to an oil leak issue that could result in a fire. The plugs were also done (again) at the beginning of the summer because originally I had installed Double-plats but removed those for AC 41-101's due to random misfire. Changed a few things (fuel pump, FPR, fuel filter, plugs and wires) but the issue was ultimately caused by the ignition control module. Regardless of these issues, it's a great engine. They will check the valve adjustments tomorrow, but they feel they are running out of options as to what might be causing the random misfires. What causes random cylinder misfire in my 1998 Chevrolet Lumina, 3800 Jay, Chevy Mechanic Chevy Replaced the fuel filter and pcv valve during an oil change. There is a "come and go" medium pitched whirring type of sound coming from the engine compartment that can be heard through the firewall at idle and higher RPM's in neutral. I put a 96 3800 series II motor out of a buick in and im getting the random misfire code and occasional backfire (usually in reverse) and exhaust smells like sulfur. If no leaks are found the next step is to replace the spark plugs. Part 1 -How to Diagnose Misfire Codes P0300-P0306 (GM 3. If you are getting a random missfire code after changing plugs and wires you have a broken valve spring or a hole or crack in a cylinder. After their little test drive the problem still wasn't fixed. Cleaned the mass air flow sensors before that also had a ignition control module code replaced that. When an intermittent misfire occurs while driving, the first thing to do is remove the spark plugs and inspect them carefully. If your spark plug is fine, leave it alone and proceed to inspect the ignition wires. Code P0300 stands for “Random or Multiple Cylinder Misfire Detected. Still a p0300 code random misfire. P0309Cylinder 9 Misfire Detected. I will update on the status in the coming days. What is a good thing to check?. GM does not provide a fuel volume test spec but, as a rule, a . P0301 Cylinder #1 Misfire. It's not heavy. It has an intermittent no start and intermittent stall,It has 2 codes. Fuel injection was checked and found to functioning normally. Codes are P0300, P0455, and P0741. As I understand, to get an actual missfire code set, the missfire must be consequtive on one cylinder. One or more misfire codes will be stored in the car or mini-van's computer memory (if OBD II equipped). 2 Find and seal any vacuum leaks. then a code popped up and read crank sensorreplaced that and worked for a week or so,then the cam sensor popped up so we replaced that and worked for a day or two,we replaced again with no change,we then replaced …. 2001 Firebird Base - 3800 Series II V6, 4L60E - 3. But it's not setting any other codes. " This diagnostic trouble code (DTC) indicates that your car's computer has detected an engine misfire that's random and/or appearing on multiple cylinders. We have a 1998 Chevrolet Lumina, 3800 Series II motor (3. The most common in the Buick-3800 engine is faulty CKP sensors and ICM while there 2. In this case, CKP stands for the crankshaft position, and ICM stands for the ignition control module. If you are getting a random missfire code after changing plugs and wires you have a broken valve spring or a hole or crack in a cylinder. It appears the misfires are totally random. Pontiac - Cylinder 1 Misfire - I have a P0301 misfire on Cylinder 1 on a 2004 pontiac grand prix with a 3800 series II engine. In fact, the 3800 Series II was on the Ward’s 10 Best Engines list 1995 through ’97. 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. You'll likely find another OBD-II code—from P0301 to P0308—alongside P0300 as these all point to engine. Common 3800 Series 2 Problems 1. Replaced MAP sensor and checked PCV valve. Unfortunately I recently lost access to my Mitchell on demand account so I have been shooting in the dark while troubleshooting an intermittent throttle actuator problem. 1997 Pontiac Grand Prix 3800 series II not supercharged misfire at idle. So ill start with the info on my car. The only code I had was a P0300 Multiple random misfire that occured off and on at first, Worse in. This tcpalmertw Thread Jan 30, 2013. During driving intermittent misfire Cracking of engine without start The leak of Intake Manifold Coolant Buick-3800 engine’s coolant leaks particularly in engines of Series II 3800. Hence, showing an outstanding performance advantage over other 3800 series engines. The P0300 code means that a cylinder (s) is misfiring or is randomly misfiring. Here, in this case, CKP stands for the crankshaft position, and ICM stands for the ignition control module. The TPS now reads 0% at fully closed position, where before It used to read about 2-4% in the closed position. i cant seem to find out what it is and the dealership bullshitting me. The Buick 3800 Engine series 2 V6 is a fairly reliable engine, but coolant leaks have been a problem on Series II 3800 engines with the plastic intake manifold. Intermittent. P0300 Random multiple misfire solution, Buick/GM/pontiac series 2 3800 v6 part1 D. You’ll likely find another OBD-II code—from P0301 to P0308—alongside P0300 as these all point to engine. I heard some noise when i was driving home. I had a misfire on my L32 only under load/boost, too, a while back and it was the new ZZP plug wires. Could be a lot of things, need more information F Fsharp Joined Dec 11, 2015 Messages 475 Location. 3800 Head Gasket Replacement Part 1 ⭐ 1997 Buick Lesabre - 3. The P0300 code means that a cylinder (s) is misfiring or is randomly misfiring. Engine Cracking Without Starting The most common in the Buick-3800 engine is faulty CKP sensors and ICM while there can be a variety of causes for no start. High pitch noise from the engine Broken vacuum hoses can often result in a high pitch noises because the engine is sucking air all the time through the leak, which will create noises. P0305 Cylinder #5 Misfire. I have the sulfur problem figured out (gas in cat due to misfire) I changed the intake on this motor to adapt it to rear wheel drive. It was a P0300, random multiple misfire, took it to the shop they changed the plugs wires and a PVC valve. working with a 2001 chevy impala LS, 3800 series ii engine - began to really run oddly when accelerating or under any kind of load. The P0455 and P741 codes were already existing. In fact, the 3800 Series II was on the Ward's 10 Best Engines list 1995 through '97. I built a transmission - I built a 6. When this becomes severe enough, the driver will feel a jerking . Not being a cheap fix it took me about 3 or so months to get that done. I put a 96 3800 series II motor out of a buick in and im getting the random misfire code and occasional backfire (usually in reverse) and exhaust smells like sulfur. I HAVE A Buick 3800 series 2 for months we have had issues with misfires. Swapped the 2 map sensors to see if it. After 60,000 miles or so, the OEM intake manifold gasket tends to deteriorate in the area that seals the cylinder head coolant passage to the. One or more misfire codes will be stored in the car or mini-van's computer memory (if OBD II equipped). I'm trying to fix it without firing a parts cannon. ( See the sidebar at the end of this article ). working with a 2001 chevy impala LS, 3800 series ii engine - began to really run oddly when accelerating or under any kind of load. In the morning, when cold, (below 40f) The car has a terrible misfire for about 2 or 3 minutes until it. It starts, idles and drives smooth, but the problem is acceleration under load. Code P0300 stands for "Random or Multiple Cylinder Misfire Detected. 341 cam sensor out of range and 342 cam circuit low. I replaced the crank sensor about 3 months ago when it quit working. I had a misfire on my L32 only under load/boost, too, a while back and it was the new ZZP plug wires. In the morning, when cold, (below 40f) The car has a terrible misfire for about 2 or 3 minutes until it…. Noticed what seems to be a minor fuel leak at the quick connect from the fuel line to the fuel injector rail. P0302 Cylinder #2 Misfire. Here's what I've tried so far: New plugs and wires. A simple test is to move the spark . 3800 series 2 Cold start problems. One or more misfire codes will be stored in the car or mini-van's computer memory (if OBD II equipped).