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post #1 of 4 Old 08-04-2009, 10:16 AM Thread Starter
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multiple missfire

I have a 2001 grand chrokee that is reading multiple missfire p300 thorugh p306. I replaced the plugs a couple of weeks ago and before that I replaced the crank shaft positioning sensor. Any Ideas what is causing this?
thanks for the help.

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post #2 of 4 Old 08-04-2009, 11:42 AM
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just a guess from reading lots of older related posts, but could be your PCM. you might need a new one

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post #3 of 4 Old 08-04-2009, 03:16 PM
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do you have any symptoms of a bad tps like erratic idle or surging? this can also give "false" misfire codes, I've seen it myself
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post #4 of 4 Old 08-17-2009, 04:14 PM Thread Starter
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no erratic idle or surging.
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