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gadsden1776

2005 Grand Prix 3.8 3800 Series III Misfiring P0300 CEL Code

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gadsden1776

I know much has been posted on the topic, but I just wanted to mention that I am one who has ran through the gamut of troubleshooting steps for correcting the multiple misfiring issue. Mine ended up being the ICM. Replaced it with the slightly cheaper Valucraft ICM, she ran like new. Less than a year later, the wonderful P0300 misfiring came back. Had it start happening in the middle of my trip home from work. Parked it, let it sit overnight. Next day, problem was fine until I drove it for approx. 15 minutes, then it was back. It did this two more times before it finally became a permanent issue. I decided to swap out the ICM FIRST this time, and its back to running like new now. Just wanted to share this so that others know:

 

1. An ICM can fail again within a year or less of being replaced.

2. Especially if you go w/ the cheaper Valuecraft ICM

 

I bought the cheaper one again (much to my chagrin) as at the time I was only 90% sure it was the problem. If you ever get in this boat, spend the extra $30 and get the Duralast (or AC Delco) one.

 

Regards

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Nas Escobar

The general rule of ICMs and coil packs is buy AC Delco exclusively. The aftermarket is not up to par as OEM on this piece.

 

If you're getting aftermarket, buy one with a lifetime warranty. Keep the receipt and go from there.

 

Sent from my SAMSUNG-SGH-T989 using Tapatalk

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