Idle problems on lt1
#1
Idle problems on lt1
Whats up guys here is the scoop i have been helping a friend work on a 94 pontiac trans am. We have done a few mild things such as lt4 cylinder heads, lt4 hot cam and matching springs, full length headers, x pipe, flowmaster, egr valve eliminator, no catalytic converter, and a small wet nitrous kit, some mild computer tuning, it does have a th-350 tranny in it now to we ditched the 4l60. Well just recently after installing the nitrous kit the car will not run it will not idle and you constantly have to give it throttle to keep it running. We have brand new o2 sensors about 2 or 3 months old. We also replace the opti with a GM opti about 3 or 4 months ago. It has farely new msd 8.5mm spark plug wires and brand new plugs just replaced. We also tried a new fuel filter with no luck. I can hear the fuel pump prime so i believe its ok i have no way to psi test it now though because of the nitrous install. Any input or advice would be greatly appreciated thanks.
#5
Bad injectors???
So we checked the IAC no luck. So my friend brang over one of his friends and he says that its only firing on 4 cylinders now. He checked it out and you can actually touch #1234 cylinders header tubes they are cold when its running so wtf. He checked spark and it got spark so now im lost. Maybe we got bad fuel injectors i dont know is there any way we can test the injectors. It will not start either now it gets close but wont actually run.
#6
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Join Date: Nov 2007
Location: Jonesboro, Arkansas
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if you do get it running one way to check an injector is to unplug the injector and see if that effects your motor. when you unplug the injector you should hear your motor get weaker.
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#8
2 weeks after nitrous install. But the bottle has never been ran on it yet. It has ran ok up to the nitrous install and then it started doin this. What are the chances of bad injectors slim chance 1234 cylinder injectors are bad but i dont know soda.
#14
Yeah we took a spark plug wire off #1 and put a screw driver in it and grounded it to the header. It shot a good arc across the gap so i believe its ok. But i dont know if its firing at the right time but i just cant see 1-4 injectors going bad at once but i guess anything is possible. This damn car is cursed so maybe. thanks jason.
#16
Thanks jason and soda for the input. We wont get to test any of the components till this weekend but i will keep you guys posted. One more question now that we have installed the wet nitrous kit will we have problems psi testing the fuel rail because of the schrader valve being removed?