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561 ECU and rough idle 200

posted by  Ken C on  Tue Sep 21 05:13 CST 2004
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last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

My '84 (195K miles) had a lousy, really lumpy idle, for quite some time. Couldn't fix it, although I checked what I thought were all the usual suspects (even the AMM, by temporarily disconnecting it). But...
one day, the AMM died (wouldn't idle at all, unless I disconnected it), and I replaced it. As soon as I put in the new AMM, the car idled -- purred like a kitten, and it's been rock steady ever since. I feel that the old AMM was faulty all along.
My point is that while the usual test (try disconnecting it) for a bad AMM is good for diagnosing a completely dead unit, it is not sufficient for a mere dying AMM; and (in from my experience) a bad AMM can cause your problem.





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