Question about 2003 Chevrolet Silverado 1500
Engine shakes periodically; warm or cold. Did vacuume test and found nothing. Will run fine and then engine shakes with engine light blinking. I know i'm missing because i'm losing power up hills. Codes say i have a 'P0300 and P0200.' Multiple cylinder misfires, Circuit cylinder mulfunction. Also, my friend pulled some plugs while the engine was running and didn't hear a difference when he pulled the wire on the passenger side, first from the front. Could it be a bad coil? Do chevys' usually have these problem?
The p 0300 codes gives you the clue
it is random misfires and that is predominately from injector and low fuel pressure
pulling a plug lead will amke no difference if there is no fuel in that cylinder to ignite
bad coils will be a constant miss regardless
try putting a can of quality injector cleaner in the tank to see if that fixes the problem
have a fuel pressure tset done to check for pump, filter or pressure regulator problems
Posted on May 18, 2017
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Posted on Jan 02, 2017
SOURCE: Engine light code P0300
I would recommend going back with ac/delco platinum plugs.Some of these "high performance" plugs dont work well in newer gm vehicles.The computer is sensing more than one cylinder misfiring and cant determine the cylinders the style of plug your using could very well be causing this
Posted on Sep 03, 2008
IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.
Posted on Sep 03, 2009
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