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Missfire under boost.

04lss

04lss

New member
SO i got berta back today, the coolant leak was fixed but now whenever it goes into boost it starts missing.
Heads were checked and re done during the last set of repairs so im guessing its ignition related. Only thing i can think is when the coolant sprayed everywhere the ignition coils got soaked, or i have a cracked spark plug.
 


Wires are in place, on my way to class, on the interstate in rush hour traffic, it pretty much failed, any more than 5% throttle and misfire.

Did set a code, Cyl 1 misfire. Not sure if its the plug wire or coil
 


The plug did not fix it, however the plug did not look broken so i dont think its chip. Especially since i had it apart a little while ago and it was clean only had 60 miles put on it since then.
 
Odd, its much better after its been sitting, i can even go into light boost.

one of the benefits of my dad working at a "bad credit" Used car place, Lots and lots of early 2000s GM parts. He has a bunch of coils I can have.
 
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No fix, it took more boost to make it miss, but i think thats because she was ice cold. Replaced the coil and the wire. Only thing left is the ignition module/platform
 


the icm harness ground. its a eye let on a black wire, gets bolted down to the side of the coil bracket.


iirc you said you tore the engine down. just thinking of odd ball crap that can happen during re installation.
 
Yeah my dad put it back together so im honestly not sure. Hes a master tech and works on 3800 all day so i doubt it, but im going to check regardless

It was crunch time with the move so i let him take the lead
 
those are two things that can happen to the best of us really if your not watching out. seen it happen here more then once. caught myself starting to pinching my own. its a tight area.
 


No go, the harness is freely moving, and the ground loop is between a bolt and the bracket firmly tightened
 
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