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Rough idle, stall, racing, but starts OK 200 1991

posted by  Owned by Velma on  Fri Mar 6 10:39 CST 2009
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last visit: Sun Jun 23 17:56 CST 2013
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Car starts fine whether hot or cold. Idle intermittently will run up then down, and/or will drop and eventually stall if I don't kick the accelerator when it does this. The other day the revs went up quite a bit between gearchanges. Engine power seems normal and there is no stumbling or miss on acceleration though there's a slight hiccup when cruising at highway speed sometimes. On a cold start sometimes there is a miss and I have to hit the pedal to keep her going.

This is a 5-speed, 136K miles, LH 3.1 I think.

Any ideas? I'm taking it to my Volvo guy on Monday... hope it's not expensive, just got laid off. If it is the AMM will one form a LH 2.4 car work? There is one on ebay for $30. Thanks.








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Rough idle, stall, racing, but starts OK 200 1991

posted by  outofworkjoe on  Fri Mar 6 10:44 CST 2009
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last visit: Wed Mar 17 02:41 CST 2010
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Have you check for vacuum leaks?Cracked intank hose,behind AMM.








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Rough idle, stall, racing, but starts OK 200 1991

posted by  pageda on  Fri Mar 6 10:41 CST 2009
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last visit: Fri Oct 24 13:18 CST 2014
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A good place to start is by cleaning the throttle body and Idle air control valve, they both get gunked up.
http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm
The AMM from the LH 2.4 will not work on the LH 3.1, what are the last three numbers on the AMM?
Dan








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Rough idle, stall, racing, but starts OK 200 1991

posted by  Owned by Velma on  Fri Mar 6 12:12 CST 2009
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last visit: Sun Jun 23 17:56 CST 2013
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Dunno the AMM numbers, I'll probably try the TB cleaning suggestion tomorrow and will make a note of the AMM number.

Thanks for the suggestions!







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