Question about 1991 Jeep Cherokee Limited

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My cherrokee spits,sputters & bucks whenever I come to an upgrade. Also when I step on the gas while driving as to increase my speed? I've changed plugs;wires;cap;rotor;MAP sensor;tps;oxygen sensor; coil & it still does it. When I put it to the floor to pass it goes like hell,no problem. What could be causing this to happen? Inline six, 4.0 automatic, MPI, 4x4.

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  • Rollin Miller Jul 27, 2009

    Just want to thank you thundergod. I took out the injectors & man were they cruddy. I cleaned them up & my 1991 Jeep Cherokee is running better than ever. Thanks again for the help.

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  • Jeep Master
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Sounds like you have thrown the kitchen sink at it!!! Have you done any testing to verify that the parts you replaced had a problem? If not, you can empty your bank account and not fix this.
I'd check the tps and also the injectors, which may be working but if pintles are dirty or worn out it can alter spray pattern...On hard acceleration, you literally can stick a garden hose in the air inlet and it will work...at lower rpm and load, pattern needs to be much more precise. I'd do a lot more testing and looking before buying any more parts though.

Posted on Jul 11, 2009

  • Richard Scordino Jul 27, 2009

    Glad to hear it's fixed...Best way I know of to keep the injectors clean is to add 3oz of acetone and 3oz of marvel oil per 10 gals of fuel about once per month. It will not harm system seals and usually gives better mpg as well as cleaning the injector nozzles. Only time I saw this fail is on a pontiac that someone had "repaired" the fuel pump with "fuel proof" glue...The acetone turned the glue to goo. But no stock system has glued in components!!!
    Good luck!!


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