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97GSXmitsy

20+ Year Contributor
54
0
Apr 1, 2002
where ever, New Jersey
alright i bought my buddy drews old talon. he finished putting the car together the night before he left for south carolina. on initial start up he found or at least thinks the ecu is dead. it just cranks but wont start...which is a typical dead ecu symptom. so i ran home and grabbed the ecu out of my other RUNNING 92 talon. that still didnt start the car. but the running car i took the new ecu from idled like it had cams in it, (car is completely stock, even stock air filter). I ran the part number on that ecu and up as a 1990 5spd ecu, so it was the wrong year. but...i also had another 1990 eprom ecu that i got from motoguys garage...plugged that into my stock dsm (not drews) and it made it idle like a caddy (no more cam-like idle.) so i took that ecu figuring it was good, plugged it into drews car and it started if i assisted it by reving the gas. it had a bad miss and it idled at 4k rpm. drews car has a fmic, 2g mass, afc2, 16g, etc. what im wondering/hoping is...if i order a new 1992 5spd turbo ecu from motoguys will it fix the problem. if anyone has any input please let me know asap.
 
Why dont you take the one that you KNOW is good, from your other car that is now idling good, and put it in the car your trying to get running. If it runs good then you know the ECU is the problem.
 
the one that made the other car run good made the new car start but it idled at like 4k and it takes some throttle to get it started. all the other ecus i have wont even start the car. and the "good" ecu is for a 90 and 90 ecu supposedly make 91 and up run like shit.
 
the one that made the other car run good made the new car start but it idled at like 4k and it takes some throttle to get it started. all the other ecus i have wont even start the car. and the "good" ecu is for a 90 and 90 ecu supposedly make 91 and up run like shit.

Oh sorry, I read your post wrong. Well its obviously not the ECU then if it works in one car and not in the other.
 
A bad ecu is but one cause for a no run or start symptom. Others are:

1. Faulty CAS
2. Faulty fuel pump
3. MPI relay malfunction
4. Popped MPI fuse (simple fix)
5. Dead ignition transistor
6. Harness short
7. Faulty coolant temp sensor
8. Faulty MAF

Don't be suprised if this thread is moved to a more appropriate forum. . .
 
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