Question about 1995 Jeep Grand Cherokee

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Backfire under load 2.5 1993 - 1995 Jeep Grand Cherokee

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  • stollarcynth Mar 05, 2009

    yes new cap and rotor changed throttle position and crank sensor no change seems to start popping thru intake at about 2500 rpm

  • stollarcynth Mar 05, 2009

    I havent had the distributor out It doesnt do it all the time also checked fuel no water changed fuel filter

  • stollarcynth Mar 05, 2009

    Thanks Ill try that

  • Richard Scordino May 11, 2010

    have you checked cap wires and rotor for tracking and cracks.& checked coil output.



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Don't forget there is still an engine under all the electronics Put a vacuum gauge on it and see if you have steady or rapidly fluctuating reading (which translates to bad cam lobe or burned valve.) Otherwise, the only other thing I can think of is that if you removed the distributor at any point, you may have it one tooth off, changing ignition timing.

Posted on Mar 05, 2009

  • Richard Scordino Mar 05, 2009

    Actual spark timing is controlled by "cam sensor" (hall effect unit where points would go inside distributor) Make sure that the mount plate has not become loose in there and is allowing timing to change as you drive. What vacuum readings do you have running? To eliminate stuff you need to verify it's OK!!!



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