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intermittent idle problem in New Zealand 900 1996

posted by  baz on  Mon Mar 14 22:04 CST 2005
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Hi Brickboarders,

Hopefully someone can help me out and point me in the right direction. I have a 1996 Volvo 940 Estate Automatic with a B230 FK (Low Pressure Turbo)and only 123000 km's. Has been running really smooth and well (very well maintained!), but lately the engine idling gives me trouble. Particularly when waiting at a traffic light while in Drive (automatic) and foot on the brake, the engine almost "shivers" for a very short time (1 second)while the rpm also drops for the same amount of time. After that, idle surges a little up and down. This is an intermittent problem. Sometime it runs really smooth but the next day, or the next traffic light or intersection, the problem arises again. It is a little like a tooth ache. When you go and see a dentist, it doesn't hurt anymore, so my garage thinks I'm talking rubbish. Don't know what I'm dealing with here. Could this be a sticking Idling Air Contol Valve? I would really appreciate some comments and/or ideas!!

Baz in Christchurch, New Zealand








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    intermittent idle problem in New Zealand 900 1996

    posted by  940_user on  Tue Mar 15 19:25 CST 2005
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    The problem may be related to a bad fuel pre-pump inside the fuel tank. I'm having a similar problem with my 940. Please follow this link.

    http://www.brickboard.com/FAQ/700-900/FuelSystem.htm#FuelPrePumpProblemsDiagnoses








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    intermittent idle problem in New Zealand 900 1996

    uid 19's pic
    posted by  jbowers on  Tue Mar 15 10:31 CST 2005
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    last visit: Sun Jan 22 13:49 CST 2012
    [RELATED]

    Maybe your Throttle Position Switch isn't working correctly. If it is intermittent, the ECU may not "get the message/signal" that the throttle is closed and the idle air system is supposed to go into operation.
    --
    '96 965, 16' wheels, rear 18mm bar & Koni + 204HP cams at 123K. Had '85 745 Turbo Diesel for 200K.








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    intermittent idle problem in New Zealand 900 1996

    posted by  Steve on  Tue Mar 15 00:51 CST 2005
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Sounds like dirty throttle body: clean that first per 700/900 fAQ instructions under "features" button above (see Engine: Performance)








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    intermittent idle problem in New Zealand 900 1996

    posted by  someone claiming to be jpezie on  Mon Mar 14 23:56 CST 2005 [RELATED]

    From your problem description i get the suggestion that indeed your idle control valve and air inlet are dirty (sticky)
    The cleaning method is described in the FAQ.
    It is fun to do and the results are great.
    Just cost you a little money for papergaskets.

    Good luck,
    John







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