jonjon-1 Posted August 17, 2010 Share Posted August 17, 2010 A couple weeks back, i was driving for a while(car was warmed up) and all of a sudden, the check engine light began blinking, as well as i noticed a couple cylinders missfiring. i checked with the ob2 and the code read p0302. since then, i switched the #1 & #2 coils and spark plugs. the problem is still there. if i floor it, the missfiring seems to go away. but once i let my foot off the gas, it instantly starts missfiring again. only once the car has warmed up does it have this problem. it's gotten a lot worse, too. please clue me in- i can't afford a trip to the dealer! Quote Link to comment Share on other sites More sharing options...
intakerGS Posted August 18, 2010 Share Posted August 18, 2010 As the problem concentrates on one cylinder, I suggest you start with the next: - injector faulty when warming up (low/erratic pressure, when letting go of gas/idling) - compression test cylinder - unlikely, but worth a check, a faulty plug-cable. When it's the injector, a cleaning additive might help. There are a lot of other possibilities too, but then some more codes would be involved I suppose.. * Incorrect ignition timing * Vacuum leak(s) * Low or weak fuel pressure * Improperly functioning EGR system * Defective Mass Air Flow Sensor * Defective Crankshaft and/or Camshaft Sensor * Defective Throttle Position Sensor * Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems Quote Link to comment Share on other sites More sharing options...
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