Question about 2003 Chevrolet Impala

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I have 03 chevy implala with 3.4. have check engine light condition with PO 302 code with scan check. Says #2 misfire condition. Tried a new plug wire and spark plug. Could it be coil pack. Thanks Steve G

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  • Chevrolet Master
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What was the condition of the spark plug when replaced, was it indicating to a lean or a rich air fuel ratio. When is it misfiring?? during idle or while driving. The easy way to see if it's misfire during idle, disconnect the #2 wire from the plug and run the engine and see if there is any difference in the idle. If there is then the plug is firing and your getting the misfire during driving and that could be caused by a dirty fuel injector in cylinder #2 and may need it cleaned of replaced, but check the wire harness to the fuel injector it self be fore you go through all that. Good luck and keep me posted, be glad to help

Posted on Jun 15, 2009

  • jerryricerai Jan 18, 2011

    i have this problem and one of my sensors was out because pistons 3 and 5 weren't firing

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  • Master
  • 1,959 Answers

Based on your info, check the following:

  1. Bad fuel injector
  2. O2 sensors
These are the first two places I'd check.
After every repair, it's important to clear the fault before trying something else so you don't fix something that's working. (including the repair you just made)
Below is a page to describe the fault:
http://www.obd-codes.com/p0302

Best of luck.
Greg

Posted on Jun 15, 2009

  • Greg Margossian
    Greg Margossian Jun 20, 2009

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