Volvo RWD 900 Forum

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Rough Idle & High Miles 900 1994

posted by  rzh on  Tue Apr 18 09:44 CST 2006
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last visit: Thu Jul 31 08:25 CST 2014
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Hello,

My 940 is running rough at idle @ 500-600 rpm, It has 203000 miles on it. What should the rpm's be at idle,and how would I go about adjusting it. When I put it in neutral, it tends to run smoother. Also how do I retrieve fault codes? Thanks








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Rough Idle & High Miles 900 1994

posted by  chudar on  Fri Apr 21 14:56 CST 2006
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last visit: Fri Jun 13 20:29 CST 2014
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I had the same symptoms on my 1993 940. I bought it used with 238k miles, I replaced the alternator, battery, starter, distibutor, head gasket (myself), ignition coil, rpm sensor, exhaust. After all that I still had no start and rough idle. After replacing the plugs/wires, it all went away and I'm at 289k miles and running every strong. Installed NK filter, Toronda device and you can feel the difference. Take care of your baby and it will take care of you.








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Rough Idle & High Miles 900 1994

uid 5995's pic
posted by  alanclarkeau on  Thu Apr 20 00:49 CST 2006
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last visit: Sun Jan 30 21:58 CST 2011
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Hi

I'd check the 700/900 FAQ. There is an amazing wealth of info.

The throttle body would be a good place to start (assuming you've checked plugs, leads and cleaned the distributor cap etc).

Alan
--
Alan Clarke, Australia







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