Question about 1991 Volvo 940

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Runs rough then clears up &runs great

Some time when driving the engine will start to surge & run rough & black smoke comes out the exhust i notice that the turbo gauge will bounce up and down if i feather the fuel peddle it seams to clear its self and runs ok it only happend 2 times in the last 3 weeks other than that it runs great

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  • yadayada
    yadayada May 11, 2010

    I suspect the Mass Air Flow sensor is the problem, but before you replace anything run a test to get any trouble codes from the computer, Krafen and other parts stores do it for free, then get back to me on this post.

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Found waste gate on turbo sticking freed up ok now

Posted on Sep 22, 2008

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