1990 240 Runs very rich

Discussion in 'Volvo 240' started by John Major, Aug 22, 2003.

  1. John  Major

    John Major Guest

    I have had the car off the road for a year and have now licensed it
    again......it is running very rich, with black smoke coming from exhaust.
    Runs very rough until it warms up after a cold start. If anyone has any
    idea why this would happen after sitting for a year, I'd certainly like to
    hear them.....I am not familiar with all of the sensors on this car and
    need help. Thanks in advance for any help you can give me....it still runs
    reasonably well, but has very poor gas mileage and leaves the cars following
    me in a smoke screen when starting from a traffic light. All help
    John Major, Aug 22, 2003
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  2. John  Major

    Vrparts Guest

    Check the Fuel Pressure Regulator.
    It uses engine vacuum to control fuel pressure. If the diaphragm develops a
    pinhole leak, fuel will be sucked into the intake manifold. At idle it will
    run rich. At speed the computer will back off on the injectors to compensate.
    Check the vacuum hose for blockage also.


    79 245 D,
    81 240 D,
    86 240 320,000mi and running when traded
    94 944 White 144,000 The New one
    94 944 Green 257,503 mi CRUNCH Parted out
    94 944 Maroon 135,000 mi
    Vrparts, Aug 25, 2003
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