Question about Jeep Grand Cherokee

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95 jeep grand cherokee, 4.0 engine. problem:motor bouges down intermitenly, usually when hot, 1/2 tank fuel and under a little extra load. replaced converter a couple years ago and ignition module a couple days ago. also replaced plugs and wires last year.

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  • dsf59ba Jul 18, 2009

    Thanks, I replaced fuel filter, rotor and cap this morning. I'm going outside now to look at the air filter and pvc valve.

  • dsf59ba Jul 18, 2009

    air filter is very good condition and no signs of problem on pvc valve or tube(both made of hard plastic). when motor bouges down if you try to give it gas it seems to bouge down more.I was driving back from a 4 hour trip after 3 1/2 hours of smooth driving I started up a slight grade with cruise control on, when the transmisson should have down shifted the motor began to bouge down. From then untill i got home i had to feather the gas to keep the car runnig smoothly.

  • dsf59ba Jul 19, 2009

    no, check engine light dosen't come on at any time. I'm going to check fuel pump today. Thanks

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  • Master
  • 6,784 Answers

HI, this is a fuel distribution issue, coupled with a airflow issue as well. I would replace the fuel filter asap, if possible. i would also recommend replacing the air filter as well. this will improve combustion(A clean air filter is essential for proper combustion).

Next. Inspect the PVC Valve and the hose as well. the valve may be clogged and, the hose may have collapsed as well. replace each component if found to be faulty.

Before you preform the suggested procedures above, have the ECM scanned for stored trouble codes. you may have some codes stored that will point out a hidden issue. this will happen at times. You can receive a scan at your local dealership or your local Auto zone auto parts store as well. (Auto Zones will scan for free)


***(Have the intake manifold gasket inspected if possible)

Posted on Jul 18, 2009

  • 4 more comments 
  • Michael Masters
    Michael Masters Jul 18, 2009

    PCV Valve***

  • Michael Masters
    Michael Masters Jul 18, 2009

    ok, i will be standing by for further discussion..

  • Michael Masters
    Michael Masters Jul 18, 2009

    OK, i suggest testing the fuel pumps voltage. you should get 12V. if its less, this will be the issue. This is a fuel distribution issue no doubt. it will either be a fuel pump issue with low voltage or, weak pump motor or, it will be a dirty fuel line.

    its best to test at the pump by using the pump terminals. you can preform this test with a basic Volt meter.You can also, disconnect the wire connectors and use the pins for testing as well.

    I would also preform a pressure test as well just to make sure of the proper fuel pressure. this will allow you to test for good fuel pump action as well. if the pressure is weak, you will need to replace the fuel pump and pressure regulator.

    Here is the proper testing procedure for testing the fuel pressure.


    1. Remove the plug from the test port and engage a test port fitting in its place.

    2. Connect a fuel pressure gauge to the test port fitting.

    3. Start the engine and let it idle.

    4. The pressure gauge should read 14-15 psi (97-103 kPa).

    5. If the pressure is correct the fuel pump is operating normally.

    6. If the pressure is not correct, adjust the fuel pressure regulator to obtain the correct pressure by turning the screw at the bottom of the regulator inward to increase pressure or outward to decrease pressure.

    7. If the fuel pressure is considerably above specification and adjusting fails to lower it within specification, inspect the return line for an obstruction.

    8. If the fuel pressure is considerably below specification and adjusting fails to raise it within specification, momentarily pinch off the return line and recheck the pressure. If pressure has risen, replace the regulator. If it has not, check the filter and supply line for an obstruction.





  • Michael Masters
    Michael Masters Jul 18, 2009

    Fuel pressure will rise to as much as 95 psi (655 kPa) when the
    return line is pinched shut. Shut the engine down immediately after
    pinching off the return line.


  • Michael Masters
    Michael Masters Jul 18, 2009

    When the engine is idling , are you seeing an illuminated check engine light by any chance?

  • Michael Masters
    Michael Masters Jul 19, 2009

    ok..



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