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1991 Ford Ranger Question: having problem with bucking and surging

 

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RALPH ISABELLA, Oakwood, GA, December 29, 2011, 09:30
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bucking surges at a stop. i have replaced mas and computer and truck still bucking and surges. no codes.

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, December 29, 2011, 09:57
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     Master

    It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Look for air/vacuum leaks around the intake manifold. Look to see if the EGR valve either leaks or does not seal/fully close. Important to look and see the ignition system isn't causing the misfire/stumble.

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    RALPH ISABELLA, December 30, 2011, 07:54
     Rookie

    if ignition is causeing mis fire would it show a code

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