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04-23-2013
Have a 2006 gp with 3.8 series 3 125,000 miles and i get a p303 code when i get the rpms up to 5000 and it never misfires untill i hit 5000. i have replaced the wires, coils, spark plugs, and switched the injectors around nothing changed it the light still flashes when i get to 5000 rpms also today when i came to stop and went to take off it got a p300 code. any help thanks.
04-23-2013
Why you running it with the Rpms so high?
04-23-2013
I dont drive it like that im just saying thats the only time it misses it happend when i was passing a car and thats when it threw a code
04-23-2013
What plugs?
It may be the ICM causing this issue aswell.
04-23-2013
Good. I was gonna say I wouldn't run that hard. Can't be good for it. Maybe try cleaning the Mass Airflow wire connections. My old 99 gp se 3.1 had a aweful idle and check engine light would come on. Doing research I pulled the connection the the Mass Airflow and it smoothed out and the light went off. I then cleaned the connections up good with WD-40 and it ran perfect again.
04-24-2013
Could that cause just one cylinder to missfire?
04-24-2013
Not likely
04-25-2013
So what could cause just cylinder 3 to missfire?
04-25-2013
chipped piston, or a clogged cat. check the spark plug for damage, the old plugs, were they still all there? or was one smashed or missing the bottom part?
flashing cel means misfires, or clogged cat.
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