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surging rpm 850

posted by  someone claiming to be Leah on  Tue Sep 18 07:20 CST 2007 [RELATED]

I have a '93 volvo 850 with 179,000. I recently replaced the mass air flow sensor, air filter, and just installed a new battery the other day. When I start the car, the rpm surges to 1500, rises to 2100, and drops to 1500. The car revs like this until I turn it off. I've let it run for about 5 min. and it doesn't stop. I've tried different times of day with no difference. No check engine lights.

Someone mentioned it might be the throttle positioning sensor. Any other ideas or confirmation? Or possibly a cheaper way of fixing the problem?

Thanks,
Leah








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    surging rpm 850

    posted by  someone claiming to be fixit2003 on  Thu Sep 20 07:06 CST 2007 [RELATED]

    Maybe check the Volvospeed site "Bay 13". I think the early 850's had problems with the MAS connector and wireing.








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    surging rpm 850

    posted by  KlausC on  Tue Sep 18 10:53 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Check for air leaks first. Ensure the position of the new MAF sensor is correct and the clamps on the air hose are tight. Also check all lines coming from/to the intake manifold are tight.

    Klaus
    --
    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








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      surging rpm 850

      posted by  someone claiming to be Dirk on  Tue Sep 25 11:08 CST 2007 [RELATED]

      Had the same problem. Change petrol pressure regulator(leaks to manifold)
      Dirk/Antwerp







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