Injector not Firing (not the usual problems)
07-09-12, 09:45 PM
#1
Injector not Firing (not the usual problems)
So I have a buddy that I built the motor and tuned. The car was running good for around 1.5k km. Anyway, he's been moving it around the shop and hasn't really driving it in a few weeks and now the car is running on one rotor.
I've diagnosed the problem to no injector firing on the rear bank but I can't figure out for the life of me why its doing it. Checklist of everything I've done and confirmed.
1) Compression is mint
2) injector has been swapped (oem 850 primary)
3) all coils are firing
4) PowerFC has been swapped out for a known good working one (even checked back in the car it was pulled from to verify if it was still good)
5) continuity confirmed between ecu and injector clip
6) 12V confirmed on the power wire
7) tested all injectors with 9V battery and every single one clicks.
8) all sensors on the PowerFC are working like normal
Basically with the car running, I can pull the rear injector clip and there is zero difference in the running of the car. It sounds like its running on one rotor and revs clean but slower then normal. The wideband reads lean when its running on one rotor which would make sense.
I did get the car running at one point like normal. It was really a fluke, I started the car with the injector clip off then plugged it back in and it started like normal. Drove it outside and then it went back to running on one rotor. Was not able to replicate it to get it running like normal again.
I am really stumped, I don't know what else there is to test. It doesn't look like the harness is damaged and there is continuity. Derp Derp
thewird
I've diagnosed the problem to no injector firing on the rear bank but I can't figure out for the life of me why its doing it. Checklist of everything I've done and confirmed.
1) Compression is mint
2) injector has been swapped (oem 850 primary)
3) all coils are firing
4) PowerFC has been swapped out for a known good working one (even checked back in the car it was pulled from to verify if it was still good)
5) continuity confirmed between ecu and injector clip
6) 12V confirmed on the power wire
7) tested all injectors with 9V battery and every single one clicks.
8) all sensors on the PowerFC are working like normal
Basically with the car running, I can pull the rear injector clip and there is zero difference in the running of the car. It sounds like its running on one rotor and revs clean but slower then normal. The wideband reads lean when its running on one rotor which would make sense.
I did get the car running at one point like normal. It was really a fluke, I started the car with the injector clip off then plugged it back in and it started like normal. Drove it outside and then it went back to running on one rotor. Was not able to replicate it to get it running like normal again.
I am really stumped, I don't know what else there is to test. It doesn't look like the harness is damaged and there is continuity. Derp Derp
thewird
07-11-12, 09:33 AM
#2
"Elusive, not deceptive!”
So I have a buddy that I built the motor and tuned. The car was running good for around 1.5k km. Anyway, he's been moving it around the shop and hasn't really driving it in a few weeks and now the car is running on one rotor.
I've diagnosed the problem to no injector firing on the rear bank but I can't figure out for the life of me why its doing it. Checklist of everything I've done and confirmed.
1) Compression is mint
2) injector has been swapped (oem 850 primary)
I like to swap front to rear on a problem like this..... known good one to questionable to see if the problem changes rotors.
3) all coils are firing
4) PowerFC has been swapped out for a known good working one (even checked back in the car it was pulled from to verify if it was still good)
5) continuity confirmed between ecu and injector clip
6) 12V confirmed on the power wire
7) tested all injectors with 9V battery and every single one clicks.
8) all sensors on the PowerFC are working like normal
Basically with the car running, I can pull the rear injector clip and there is zero difference in the running of the car. It sounds like its running on one rotor and revs clean but slower then normal. The wideband reads lean when its running on one rotor which would make sense.
I did get the car running at one point like normal. It was really a fluke, I started the car with the injector clip off then plugged it back in and it started like normal. Drove it outside and then it went back to running on one rotor. Was not able to replicate it to get it running like normal again.
I am really stumped, I don't know what else there is to test. It doesn't look like the harness is damaged and there is continuity. Derp Derp
thewird
I've diagnosed the problem to no injector firing on the rear bank but I can't figure out for the life of me why its doing it. Checklist of everything I've done and confirmed.
1) Compression is mint
2) injector has been swapped (oem 850 primary)
I like to swap front to rear on a problem like this..... known good one to questionable to see if the problem changes rotors.
3) all coils are firing
4) PowerFC has been swapped out for a known good working one (even checked back in the car it was pulled from to verify if it was still good)
5) continuity confirmed between ecu and injector clip
6) 12V confirmed on the power wire
7) tested all injectors with 9V battery and every single one clicks.
8) all sensors on the PowerFC are working like normal
Basically with the car running, I can pull the rear injector clip and there is zero difference in the running of the car. It sounds like its running on one rotor and revs clean but slower then normal. The wideband reads lean when its running on one rotor which would make sense.
I did get the car running at one point like normal. It was really a fluke, I started the car with the injector clip off then plugged it back in and it started like normal. Drove it outside and then it went back to running on one rotor. Was not able to replicate it to get it running like normal again.
I am really stumped, I don't know what else there is to test. It doesn't look like the harness is damaged and there is continuity. Derp Derp
thewird
Is this a "Tail of the Dragon" car?
Tire wear on the harness in the wheel well?
Barry
07-11-12, 02:06 PM
#3
I checked that too, I looked at the fender liners and neither have a scratch on them. The car hasn't really seen much action. I haven't had time to go look at it again. I'm gonna try swapping injectors again, maybe the ones I put in there were bad. The injector clips seemed fine just looking at them.
thewird
thewird
. Thanks guys.
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM