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Intermittent stumble/rough/stall 850 1995

posted by  roger on  Fri Jul 2 06:10 CST 2010
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last visit: Fri Sep 12 22:18 CST 2014
[RELATED]

Thanks for the suggestions. The vacuum lines are in pretty good shape - replaced not too long agon when I had other things apart. I did double check them, and all seemed in order.

I could not definitively conclude MAF last night - in the garage, it performed flawlessly. (The joys of an intermittent issue.) Before departing work yesterday I performed the "clean the contactors by disconnecting and reconnecting 20 times. It ran fine for ~20 minutes (half way home), then started stumbling again. Testing in the garage later, all worked fine. Unplugging the MAF gave the expected result as the ECU used the substitute signal.

Do you know what the MAF failure mode tends to be? I imagine that open circuit or short circuit would be an outright failure that would cause the substitute signal to be used; is there a typical "erroneous signal" failure mode?

Roger
95 854T 232k miles
'87 245 M47 285k miles






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