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

12414 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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So I removed both ECM fuses for a few minutes, put them back and started the engine. Ran okay for about 30 seconds, then bogged down to a rough idle and lights come back on again. I pulled the codes and it just says P0304 now..... how do I test to verify if the coil is the problem?
Does the coil boot have a spring in it ?
Or is it all in one
 
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