FI Help!
03-30-03, 08:43 PM
#1
FI Help!
Here's the problem in a nutshell:
Have a 2G ITS car built with S5 injection. Car ran great at our last event at Mid-Ohio last fall. Loaded the car on the trailer and let it sit for two weeks then took it to Gateway. It rained alot on the way there so it's possible something got wet on the open trailer. We unload the car and it fires right up and we let it sit to idle and warm up. After a 5 minute warmup or so I grab the throttle bell crank to rev it up and clean it out and it fall flat and dies. Hmmm... Starts right back up and idles fine. Try to rev it and it lean bogs and dies. Bottom line is it's not getting fuel under hard throttle situations. As long as the throttle is in contact with the short range TPS sensor it revs fine. As soon as it breaks contact with the short range sensor it breaks up and lean bogs.
Things we've swapped for known good parts:
TPS
CAS
ECU
Injectors
AFM
Plugs, wires and coils (just for fun)
I've ohmed the harness and everything seems right. The only thing I haven't swapped in is another OMP. The symptom is very similar to what happens when the OMP goes bad and the ECU falls into limp mode. But the OMP checks out according to the FSM and a mult-meter. I've spent close to 20 hours on this damn thing and am totally at a loss. Short of swapping in all new parts (I have swapped in all known good parts) there is nothing I can even think to check. Anyone?
Chris
Have a 2G ITS car built with S5 injection. Car ran great at our last event at Mid-Ohio last fall. Loaded the car on the trailer and let it sit for two weeks then took it to Gateway. It rained alot on the way there so it's possible something got wet on the open trailer. We unload the car and it fires right up and we let it sit to idle and warm up. After a 5 minute warmup or so I grab the throttle bell crank to rev it up and clean it out and it fall flat and dies. Hmmm... Starts right back up and idles fine. Try to rev it and it lean bogs and dies. Bottom line is it's not getting fuel under hard throttle situations. As long as the throttle is in contact with the short range TPS sensor it revs fine. As soon as it breaks contact with the short range sensor it breaks up and lean bogs.
Things we've swapped for known good parts:
TPS
CAS
ECU
Injectors
AFM
Plugs, wires and coils (just for fun)
I've ohmed the harness and everything seems right. The only thing I haven't swapped in is another OMP. The symptom is very similar to what happens when the OMP goes bad and the ECU falls into limp mode. But the OMP checks out according to the FSM and a mult-meter. I've spent close to 20 hours on this damn thing and am totally at a loss. Short of swapping in all new parts (I have swapped in all known good parts) there is nothing I can even think to check. Anyone?
Chris
