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New HEAD GASKET/PLUGS/WIRES/COIL/INJECTOR . Why is it MISFIRING ??!!!

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PowerHouseCamaro

New member
2000 3.8 GTP, just wanted to do some work to the top end of the motor so it got NEW : Head Gasket, Upper and lower intake gaskets, Plugs and wires (Autolite), coil pack. When I first put it back together it was first showing multiple misfire code, then that one went away when engine warmed up and it threw "Misfire on Cylinder 6". Alright, so I figured only thing I didn't replace was the injectors, so I SWAPPED injectors between cylinder 1 and 6. I put it back together and at first start it showed again multiple misfire, it went off and then it threw MISFIRE #1(And lean on bank 1). Ok, I was POSITIVE injector was bad because the code just went from misfire #6 to misfire #1 now. So, I replace the injector, AND the coil pack for cylinder #1. Code is still on. After all, new head gasket, new plugs and wires, new coil, new injector, why in the world is it misfiring on one cylinder? (Wires are to each correct cylinder from coils so no issue there). Thanks a lot guys
 




Update : I replaced the Autolites with AC Delco and problem still occurs , misfire on %1. Replaced (from a different gtp I got) the ICM, and problem still exist. At this point issue isn't plugs, wires, injector, head gasket or coil. Damn it !!
 


Coil was replaced, I also did change the wire to see if the misfire goes to a different cylinder but it stayed on number 1. This is driving me crazy there's nothing I haven't changed I guess ..
 
Thank you guys for all the advice. Problem ended up being the lower intake manifold gasket. What's the problem ? Well, when you buy a stupid aftermarket head gasket set for 65 bucks off ebay, you end up getting an intake gasket that is NOT SHAPED at all around the injectors holes to allow injectors to sit in correctly. Its a straight line that covers almost quarter of that hole so you'd think injectors are seated well but they're not, and therefore I had a problem. I had to cut the gasket around the injectors holes and reinstall everything, it is fine now. Again, Thanks a lot.
 
Future word of advice is just to get the parts from the past store and you'll probably will be spending the same amount. eBay isn't something that I would trust when it comes to engine parts.
 


REDCOMPG said:
Future word of advice is just to get the parts from the past store and you'll probably will be spending the same amount. eBay isn't something that I would trust when it comes to engine parts.
Click to expand...
I learned that first hand now, however, I will be posting a thread about a part that advance auto parts sells and causes a lot of people so much work when the apart is actually bad! It's the coolant temp sensor.
 
PowerHouseCamaro said:
I learned that first hand now, however, I will be posting a thread about a part that advance auto parts sells and causes a lot of people so much work when the apart is actually bad! It's the coolant temp sensor.
Click to expand...

You referring to the sensor underneath the t stat housing? $15 part easy to change....works fine.
 
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