1. #1
    ejjeepe's Avatar
    ejjeepe is offline Junior Member
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    91 cherokee 4.0 sometimes hesitating

    My '91 cherokee I6/4.0 sometimes hesitates a little. It doesn't happen all the time and it doesn't seem to be temperature related. I realize it could be caused by anything. Puzzling.

    I changed the plugs, plug wires, distributor cap, fuel filter, air filter, coil. Recent fuel pump & new TPS 9 years ago. Next step crankshaft position sensor and check PCM connectors & grounds. I don't see any vacuum leaks. Anyone have any ideas?

  2. #2
    SteelHeadz's Avatar
    SteelHeadz is offline Moderator
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    Re: 91 cherokee 4.0 sometimes hesitating

    Is that Fuel Injected?

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    Re: 91 cherokee 4.0 sometimes hesitating

    '91 is MPFI, first year of the HO motor. I'd remove the throttle body, all the sensors, and give the throttle body a good bench cleaning. Pay close attention to cleaning the IAC housing and plunger on the drivers side of the TB.

  4. #4
    SteelHeadz's Avatar
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    Re: 91 cherokee 4.0 sometimes hesitating

    I second That Motion.

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