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Jeeps being weird

Discussion in 'Cherokee' started by Billy1234, Aug 31, 2019.

  1. Aug 31, 2019 at 7:10 AM
    #1
    Billy1234

    Billy1234 [OP] Well-Known Member

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    So put about 8k on the jeep since I bought it. I love it runs awsome no issues besides not making it up hills doing 55 hit a hill goes does to about 30 35 mph. Idk why it's doing it. Did spark plugs wires and cap and still doing it. Could this be fuel related? Itsa 5 speed if your wondering
     
  2. Aug 31, 2019 at 9:10 AM
    #2
    Awrench

    Awrench Well-Known Member

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    OK a 1997 cherokee - and you have a 4.0L with a manual?

    First suggestion EASY and my favorite FREE - have a scan done at one of the auto part stores.
    POST all codes.
    Pick up a can of 'seafoam' fuel treatment add to fuel tank.

    Do you have a fuel pressure gauge?
    Do you have a vacuum gauge?
    If no inquire at auto part store if they have as a loaner or rental.
     
  3. Aug 31, 2019 at 10:59 AM
    #3
    Billy1234

    Billy1234 [OP] Well-Known Member

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    There are no codes what so ever I scanned then brought it to napa and scanned again and nothing and no I dont have either my buddy does hes out of town till tommrow. Any ideas I can try now? What about egr valve? Idk if that will have any thing to do with it and I have no clue where it is
     
  4. Aug 31, 2019 at 11:22 AM
    #4
    Billy1234

    Billy1234 [OP] Well-Known Member

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    Oh and yes to the 4.0 with manual
     
  5. Aug 31, 2019 at 12:26 PM
    #5
    Awrench

    Awrench Well-Known Member

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    I do not think its an EGR issue... Don't spend alot of time looking.

    Poor performance and no codes - fuel pressure would be a place to start.

    There are NO modifications to powertrain ?
     
    JKBob 25 and Billy1234 [OP] like this.
  6. Aug 31, 2019 at 12:30 PM
    #6
    Jim Beam

    Jim Beam Well-Known Member

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    I think you should consider the fuel filter and a fuel pressure check. That 4.0 was known for cracking the exhaust manifold which can lead to a burnt valve. Also consider doing a compression check, its always good to know whats going on inside. The throttle body probably has not been cleaned in a while either. Whenever I change spark plug wires, I always go for MSD.
     
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  7. Sep 4, 2019 at 2:55 PM
    #7
    Billy1234

    Billy1234 [OP] Well-Known Member

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    So got a little time to check out the jeep today did the compression check as @Jim Beam suggested all is ok there. If it was a cracked manifold wouldnt it be a little louder? My jeep sounds like it did off the show room floor completely quite.

    @Awrench no mods at all besides a 3inch lift. Could this be caused by a clogged cat?
     
  8. Sep 4, 2019 at 3:24 PM
    #8
    Awrench

    Awrench Well-Known Member

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    Cat - your guessing.

    Check the fuel pressure - the vacuum gauge will be a help as we can check cat pressure problems with it and see if more is needed in that direction...

    Did you get the gauges?
     
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  9. Sep 4, 2019 at 3:29 PM
    #9
    Billy1234

    Billy1234 [OP] Well-Known Member

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    Yeah you caught me red handed I was guessing. I did the compression test that's ok now I have the gauge for fuel pressure just dont know how to use it I will figure that part out right now. I need this fixed got a job starting monday in Georgetown about 1.5 hrs from me and I need my jeep haha.
     
    JKBob 25 likes this.
  10. Sep 4, 2019 at 4:46 PM
    #10
    Awrench

    Awrench Well-Known Member

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    there is often a schraider valve on the injector fuel rail whare you can attach (screws on) your fuel gauge.

    Simple - check the diagram for location hope it this simple

    fuep pressure port.jpg
     
    JKBob 25 likes this.
  11. Sep 5, 2019 at 11:22 AM
    #11
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Are you running the 33"s? and stock gears? The 5 speed had 3.07 gears and likely isn't happy with the tire size.
    I have a 5 speed, 3.55 gears, and 32"s and on some hills I do have to downshift to 4th to keep from slowing down too much.
    But man on the flat or slightly rolling hills it runs great and still gets 18+mpg.
     
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  12. Sep 5, 2019 at 4:15 PM
    #12
    Billy1234

    Billy1234 [OP] Well-Known Member

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    Got 31/10.50r15 I do 60 till I hit the hill then it starts to drop quick. Downshift and all. when I downshift it wont go over 2 grand after. Still at work ganna try and do the rest if the test tommrow after I get out.
     
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