1. 2000 jeep hard to start rough idle...

    I have a 2000 Jeep Grand Cherokee 6cyl with the following problems...

    It is hard to start - always
    Rough idle - always
    Knocking or popping sound from engine - intermediate
    Lacks power on acceleration, popping sound - intermediate
    Engine light comes on and goes off

    Recently changed the plugs, dont know what else to check.

  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    5,600

    2000 jeep hard to start rough idle...

    What mfg and PN on the plugs? What were they gapped at?
    Could you read the codes? I think you might be able to do the key dance.
    And read the codes in the odometer. The procedure is to turn the key from the off position to on position 3 times (without starting the engine) within 5 seconds ending in the on position. The code should show up in the odometer. Too fast or too slow will not work.
    If not take it to or borrow from AZ or OReilly's a code reader.
    Post the codes back up here.


    Could be a number of things.


    Regards,
    JPNinPA

    Never look down on anybody unless you're helping them up. -Jesse Jackson
    Last edited by JPNinPA; 09-27-2020 at 04:29 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: 2000 jeep hard to start rough idle...

    The jeep was having this problem before I replaced the plugs. I do not remember the brand of plugs, nor do I remeber what I gapped them at. I used the specs from a Google seach for the gap. Ots been couple months now.

  4. #4

    Re: 2000 jeep hard to start rough idle...

    One person told me it might be a bad Cataylic converter, but I thought the problems would be constance, not off and on.

  5. #5
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
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    Re: 2000 jeep hard to start rough idle...

    It could be clogged CAT

    If you pull the upstream O2 sensor and symptoms go away its is likely the CAT.




    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  6. #6
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
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    Re: 2000 jeep hard to start rough idle...

    Rough start and idle could be dirty air filter, IAC and TB.
    Weak battery.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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