Started new LS1 conversion, no spark out of 4,8,5 coils. Checeked everything
#1
Started new LS1 conversion, no spark out of 4,8,5 coils. Checeked everything
I just started up a new LS1 conversion in a 94 formula firebird... Im using a Wait4MePerformance 99 conversion engine harness
It fired right up and i noticed a misfire in the car that seemed pretty apparent.
HPtuners shows no codes related to the misfire, only that it has a 100% misfire on cylinder 4, 8 and 5. It starts up no problem and idles with the mis, the miss doesnt go away when you bring the rpm's up.
I checked for fuel and has fuel on all cylinders. (checked with a noid, and swapped all injectors out).
Then I checked for spark and it has absolutely no spark coming out of 4,8,5 coils.
So its spark. I then verified it has all the grounds, even moved them to different bolt on head. Then I added extra ground wire from battery to frame and battery to engine. I then swapped the computer out with another fbody pcm with the tune loaded into it. I then swapped out the coil packs & the coil pack harness with another set. VATS is turned off fully...theres nothing in the tune that could be causing this.
Any ideas of what could cause 3 dead cylidners with no spark from the coils?
Im going to swap cam/crank sensors tomorrow and do a crank relearn. Im to the point im going to swap the wiring harness if i have to
It fired right up and i noticed a misfire in the car that seemed pretty apparent.
HPtuners shows no codes related to the misfire, only that it has a 100% misfire on cylinder 4, 8 and 5. It starts up no problem and idles with the mis, the miss doesnt go away when you bring the rpm's up.
I checked for fuel and has fuel on all cylinders. (checked with a noid, and swapped all injectors out).
Then I checked for spark and it has absolutely no spark coming out of 4,8,5 coils.
So its spark. I then verified it has all the grounds, even moved them to different bolt on head. Then I added extra ground wire from battery to frame and battery to engine. I then swapped the computer out with another fbody pcm with the tune loaded into it. I then swapped out the coil packs & the coil pack harness with another set. VATS is turned off fully...theres nothing in the tune that could be causing this.
Any ideas of what could cause 3 dead cylidners with no spark from the coils?
Im going to swap cam/crank sensors tomorrow and do a crank relearn. Im to the point im going to swap the wiring harness if i have to
#3
I dont know what year the harness is from ( I believe its a 99). Im going to verify tomorrow. Only other thought is that its a 98 harness with a 99 computer. But I cant picture that even starting up would it?
The PCM is for sure a 99 (Ive tried two 99 computers).
The PCM is for sure a 99 (Ive tried two 99 computers).