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Update but still puzzeled - intermittant no start, then limp mode, then starts 200 1993

posted by  robbmcc on  Sat Jun 8 08:03 CST 2013
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last visit: Thu Oct 23 08:41 CST 2014
[RELATED]

Was "lucky" enough to have it happen again to give me time to troubleshoot. During cranking both relays in the FPR are energized (thanks Bruce/Lucid for the education on that), there is power at fuse 4, power at Pin 5 AMM, power at the IAC valve and I didn't check pin 9 at the ECU but assumed it was ok since the AMM and IAC had power. During the process there was an occasional sputtering kind of start and then it stalled. Unplugged the AMM and it started in limp mode. Plugged the AMM back in, cleared the ECU by removing fuse 6 for a while then tried again - again no start. Now the puzzeling part - swapped in my spare AMM (again removing fuse 6 to clear) and it started right up. But wait the "spare" AMM was the same one I swapped out 2 weeks ago with the same results. It starts and runs for a couple of weeks and then does it again. Anybody ever heard of AMM's failing in a way that takes a week or more to manifest? I could have 2 AMMs with the same problem? So puzzling. The AMM is the most mysterious part on the whole car if you ask me. Any thoughts appreciated.
Robb McC






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