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1.8L W/Service Stabilitrak & Traction Control, Flashing CEL, rough idle, etc. Help!

12411 Views 12 Replies 8 Participants Last post by  Maqcro1
1.8L W/Service Stabilitrak & Traction Control, Flashing CEL, rough idle, etc. Help!

Got off work one day, hopped in, started my baby up, and she started all these crazy symptoms. I limped her home and parked her. Replaced the valve cover assembly and spark plugs, put her all back together, started her up... Same problem. Ran codes, got codes U0100 & P0304. Thought maybe I hadn't gapped spark plugs properly. Pulled them back out, checked the gap, .028. Ran codes, got the same result. Cleared those codes, I get a permanent P0300. Engine runs fine after ignition for about 30 seconds, then I get the service stabilitrak/tcs, and cel flashing-- engine starts rough idling. Checked all the lines, etc. Replaced the intake cam sensor... Replaced the champion spark plugs I just installed with AC Delco 41-122s, put it all back together. Same results.

The initial codes are U0100 and P0304. Once I clear those, I get P0300. I'm stumped. Faulty coil maybe?
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Hi, I had the same issue with my 1.8 I4 LT '09 last friday without the dropping revs. Suddenly the car jerks and the stabilitrak and abs lights on and the check engine flashing. Also the car seemed to have lost power and was reluctant accelerating from traffic light but also whilst driving, last but not least the engine was sounding rough. My trusty mechanic diagnosed it to faulty ignition coil and a spark plug change.
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