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Bogging down and backfiring after driving a few miles

Discussion in 'General Jeep Discussion' started by 96 cherokee country, Apr 23, 2018.

  1. Apr 23, 2018 at 5:22 AM
    #1
    96 cherokee country

    #1
    96 cherokee country [OP] New Member

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    Hey guys I’m new to forums but just looking for some advice. I’ve got a 96 Jeep Cherokee Country 4.0 that I’ve recently purchased. It has a new fuel pump, fuel filter, CPS, plugs, wires, cap, button, coil. I think that’s everything, but here’s my problem. It just recently started to bog down and not won’t to take fuel after driving it a few miles. It spits and sputters over 2k RPMS but only while driving. You can stop and put it in neutral or park and it takes all the fuel you want to give it. Any help would be appreciated. Thanks!
     
    96 cherokee country, Apr 23, 2018
    #1
  2. Apr 23, 2018 at 7:45 AM
    #2
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome! I had an issue like this years ago, and it was the vacuum advance not working. Have you check the vacuum lines?
     
    chris4x4, Apr 23, 2018
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    Bob likes this.
  3. Apr 23, 2018 at 9:46 AM
    #3
    96 cherokee country

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    96 cherokee country [OP] New Member

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    Thanks for the advice I’ll have to check that when I get home! Had someone else tell me possibly the CAT is getting clogged
     
    96 cherokee country, Apr 23, 2018
    #3
  4. Apr 26, 2018 at 5:20 AM
    #4
    boondoc89

    #4
    boondoc89 Well-Known Member

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    3 inch zone lift. Fox 2.0 shocks. 35 inch nitto ridge grapplers. Bushwacker flat fenders. No name steel bumpers front and back for now.
    I was thinking the O2 sensors and the CAT. The vacuum lines would be a good start. Maybe the MAF sensor is dirty??
     
    boondoc89, Apr 26, 2018
    #4
  5. Apr 26, 2018 at 3:36 PM
    #5
    96 cherokee country

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    96 cherokee country [OP] New Member

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    I checked vacuum lines and everything looked good so I checked fuel pressure next. It was great idling but under heavy load it dropped way down. Guess I didn’t clean the tank good enough after changing fuel pump and fuel filter. I changed filter on the rail again and all seems ok at the moment. I’m sure the pump may need changing again soon. Next time I’ll be a little more thorough. Thanks for the help guys!
     
    96 cherokee country, Apr 26, 2018
    #5
    OFFGRID, JKBob 25 and chris4x4 like this.
  6. Apr 26, 2018 at 5:58 PM
    #6
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Glad you found the issue! Do you have any pictures of your Jeep?
     
    chris4x4, Apr 26, 2018
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    JKBob 25 likes this.
  7. Apr 26, 2018 at 6:17 PM
    #7
    JKBob 25

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    JKBob 25 Well-Known Member

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    Welcome to the forum. Jumped in here alil late. Cool you found your issue. Good luck with your new Jeep.
     
    JKBob 25, Apr 26, 2018
    #7
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