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MAP sensor issue???? 850

posted by  Oliver on  Wed Apr 26 08:54 CST 2006
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last visit: Tue Apr 24 15:09 CST 2012
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Has anyone ever had intermittent MAP sensor issues? Just wondering cause the 96 850 non-turbo GLT has started intermittent rough idle. When the rough idle occurs, black smoke comes out the exhaust, and engines runs quite rough. Clears up in a few minutes and may not do it again for a few minutes or a few days... No codes. Dealer has not been able to replicate, so no fix yet. Just sounds like a flakey MAP sensor.

Thank you in advance for any assistance....

Oliver

Over a million Volvo miles and still smiling......

64 122S
66 1800S
86 245DL
96 850 GLT








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    MAP sensor issue???? 850

    posted by  Oliver on  Fri Apr 28 14:52 CST 2006
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    last visit: Tue Apr 24 15:09 CST 2012
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    Thanks guys for the input.

    Took the car into the dealer today and they found that the Fuel Pressure Regulator is bad and the fuel pressure is quite low. The computer is trying to compensate and is dumping large amounts of fuel making the car run really rich. The FPR is to be replaced next Wednesday. I sure could use the better milage. More to come...

    Thanks again

    Oliver

    Over a million Volvo miles and still smiling...

    62 122S
    66 1800S
    86 245DL
    96 850 GLT








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    MAP sensor issue???? 850

    posted by  KlausC on  Thu Apr 27 09:45 CST 2006
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    last visit: Fri Oct 24 10:15 CST 2014
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    When my 850 had the FPR fail it did exactly that. The pressure went through to the vacuum line in front of the manifold and into the intake. I only had this problem during cold starts, usually in the morning. A long cranking period followed by a puff of black fuel smoke and then idling like nothing was ever wrong. Of course that could have contributed to getting only 18mpg around town.

    Klaus
    --
    (V♂LV♂s 1975 164, 1995 854T, 1998 V70R)








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    MAP sensor issue???? 850

    posted by  someone claiming to be ksg on  Thu Apr 27 07:27 CST 2006 [RELATED]

    I had this symptom (though it occurred all the time) on an older Volvo with a stuck fuel pressure regulator. The pressure was over twice what it was supposed to be.







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