My 1996 3.8L is misfiring. Runs fine cold, but once it warms up a bit, it will misfire while sitting at a light or during normal acceleration. Code reader says I have a P0300, Random misfire, although the check engine light is not illuminated. Also, the Traction Control light comes on sometimes, then goes out. I think this means it is not on as that is same response you get when you cycle the Traction Control Switch to the off position. Next step I was thinking about was to pull off the plug wires one by one from the coils to see if one doesn't make a difference. Recent new parts include, fuel pressure regulator diaphram, idle air control, cam sensor, crank sensor, intake manifold and spark plugs (these were all for troubleshooting a stalling problem. Fuel pressure regular diaphram was the culprit.
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Jun 27, 2013 - NOTE: You MUST restart the engine for the misfire to go away. ... in an expert to do that test, but it might be worth it to prove/disprove the injectors being thecause. 0 ... The first is that the car should run fine even on cold starts.
Mar 24, 2009 - They also gave it to me because of this misfire problem it has. ...Engine misfires when cold but runs fine after warming up few minutes later? ... and you start next morning will also cause a misfire until it burns off the coolant.
If your check engine light comes on get it checked. To me it sounds like an engine misfire probably cause by a coil pack or spark plug wire going bad. The misfire should cause the check engine light to come on maybe even flash if the misfire is bad enough
have you isolated what cylinder is causing the misfire . You need to check the coils for proper spark at each plug. If you have spark then you will need to check each injector for proper fuel. you can do this by unplugging each injector one at a time to try to isolate which cylinder the missfire is on
or you can have your local parts store scan the car and tell you what code is stored . Most misfire with cause a service engine soon light to come on if the light is on then there is a code store .
Without your actual trouble code, I am assuming that you are have a misfire on cylinder # 5. The computer cannot really tell what is causing the misfire only that cyl 5 is not putting out full power. If it misfires when cold then smooths out as it warms up, I would say it is probably an injector that is sticky, as it warms up it starts working properly.
The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.
Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.
I do not believe that it is a problem with a valve/head gasket or cam.