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Rough idle and running, '96 850 Sportwagon (non-turbo) 850 1996

posted by  deilenberger on  Mon Oct 4 04:47 CST 2004
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Folks,

Last week my wife's 850 wagon started - what she described as a surge.

Finally got to looking at it Saturday, and what I find is:

1. Miss at idle.. rough idle and can hear the miss at the tailpipe
2. Miss when off-idle under load. Feels like a surge, but is really a miss.
3. Gas mileage appears awful - something like 12 MPG.. normally closer to
20-22 MPG.

So - I gave it a complete tuneup.. new plugs, new cap/rotor, airfilter, cleaned the flame trap (what a PITA to get to..)

Not really any better.

But - one clue - if I unplug the AMM - the idle smooths right out and the engine smooths out above idle.

I've seen and experienced AMM failures that caused the car to not continue running unless the AMM was unplugged (my son's '86 240..)- but in searching the brickboard, I can't find any references to rough running.

Ideas?

TIA!

Don Eilenberger






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