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745 Dead ECU Saga

posted by  Steve on  Tue Mar 1 13:34 CST 2005
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last visit: Fri Oct 24 07:16 CST 2014
[RELATED]

Wife was downtown, parked the car, and started it up only to find it would hesitate severely above 1,000 rpm. She staggered home and I pulled it into the garage to find:
-spark was fine at all workable rpms, even when it stumbled
-no sensor problems (AMM, ECT, TPS, RPM all worked fine)
-no fuel pressure problems
-applying a Bosch noid light to any injector harness showed that all the injectors would shut down as soon as the throttle opened up and rpms passed 1000.

I concluded that the fule injection ECU was dying. I found a 556 unit on EBay for $65, had it shipped, installed it and VOILA it solved the problem. I'll likely have the old one rebuilt by Programa or Python to serve as a good spare. These fail due to age, so the replacement is on borrowed time as well.

A tip: get a noid light made for Bosch PFI systems. I bought an OTC unit through the local NAPA for around $12 (you can buy a whole set of them for all cars for around $18). They are useful to diagnose injector troubles: they flash at each injector pulse. It's a poor man's scope.






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