Turbo Ls1 Misfire
Turbo Ls1 Misfire Hey guys,
I just recently finished the build on my 99 Camaro. Its a SBE Ls1 with a vs 7875 and a truck manifold hotside. I am having an issue with a random misfire that i can't figure out. We think it is cylinder 1, but it isnt showing up with a DTC. The only reason we think its that cylinder is the primary was 100* colder than all the others. (190-210 as opposed to 300-320) So far i have checked the following:
Coils
Plugs
Wires
Exhaust leaks
injectors
injector circuits
fresh gas and filter
New o2 sensors
I am stumped with this one. Does anybody have any ideas on where to look next? or have had the same issue?
I just recently finished the build on my 99 Camaro. Its a SBE Ls1 with a vs 7875 and a truck manifold hotside. I am having an issue with a random misfire that i can't figure out. We think it is cylinder 1, but it isnt showing up with a DTC. The only reason we think its that cylinder is the primary was 100* colder than all the others. (190-210 as opposed to 300-320) So far i have checked the following:
Coils
Plugs
Wires
Exhaust leaks
injectors
injector circuits
fresh gas and filter
New o2 sensors
I am stumped with this one. Does anybody have any ideas on where to look next? or have had the same issue?
1-148
3-180
5- tbd
7-tbd
2-152
4-150
6-150
8-148
like i said ill get to 5 and 7 tomorrow or Friday when I get time. If they all check out I’ll be looking at coil harness and pushrods next.
All right here’s an update:
i finished the compression test test and everything checked out. I smoked the vac system and found no leaks. I did a leak down test and each cylinder was 10-15%. I pulled the pcm connectors off and found some corrosion on the terminal that houses a pcm ground. I thought “aha, this is it”. Cleaned off real well with contact cleaner and put it back together. As of today the problem still persists.
i finished the compression test test and everything checked out. I smoked the vac system and found no leaks. I did a leak down test and each cylinder was 10-15%. I pulled the pcm connectors off and found some corrosion on the terminal that houses a pcm ground. I thought “aha, this is it”. Cleaned off real well with contact cleaner and put it back together. As of today the problem still persists.
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Swap the plug wire to the number 3 cylinder and see if the cooler temps follow. If not, move the coil.
To me, a cooler exhaust temp means poor ignition (atleast that would be where I start).
To me, a cooler exhaust temp means poor ignition (atleast that would be where I start).
TECH Fanatic
Joined: Jun 2013
Posts: 1,163
Likes: 16
From: Avon, Ohio
I think we have found the problem guys. Either the shop that flow tested the injectors didn’t know what they were doing or it developed the problem after the fact. One of the injectors is completely dead at idle and part throttle. However, if you give it WOT it operates just fine. So new injectors are on the way and we will see what happens. No TX2K for me this year, but oh well.