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Weird issue with backfiring

Discussion in 'Wrangler YJ (1986-1995)' started by Bigcheeze45, Apr 2, 2019.

  1. Apr 2, 2019 at 6:10 AM
    #1
    Bigcheeze45

    Bigcheeze45 [OP] New Member

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    Ok so I'm looking into buying a 93 wrangler. The guy selling it says that when he has the heat on the jeep backfires through the intake? He said he switched engines and put a new map sensor in and it still does it. I've never heard of anything like this,nor has my mechanic. So I'm asking for some help . Any ideas ?
     
  2. Apr 2, 2019 at 7:15 AM
    #2
    aggrex

    aggrex Well-Known Member

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    Welcome @Bigcheeze45 . Generally these issues are not related. Buying into this problem may not be in your best interest unless price is low and you have the time and/or resources to work on the jeep.
     
    JKBob 25 likes this.
  3. Apr 2, 2019 at 7:31 AM
    #3
    Prerunner1982

    Prerunner1982 Well-Known Member

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    That is a weird one, I can't see how opening a vent to allow warm air into the cab of the vehicle would cause a backfire. Sounds more like a timing issue.
    If you are looking for a project and you have the time to mess with it, then by all means. Otherwise I would probably walk away, his explanation just doesn't line up.

    Also welcome from Oklahoma.
     
    Last edited: Apr 2, 2019
  4. Apr 2, 2019 at 9:08 AM
    #4
    Bigcheeze45

    Bigcheeze45 [OP] New Member

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    He was having the issue before and changes engines and still has it. The price is 3k so I dont know if it's worth dealing with . It's only when he turns heat on( he says) . It wouldn't be much of an issue till winter but ..still gotta be addressed
     
  5. Apr 2, 2019 at 9:40 AM
    #5
    aggrex

    aggrex Well-Known Member

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    Tread carefully as some misfires can be caused by different issues like vacuum leaks, timing, carb air-fuel mixture etc. Bit unusual the engine installer is not addressing the issue despite attempts with the MAF. The 6cyl with a rust-free body+frame would be interesting.
     
    JKBob 25 likes this.
  6. Apr 2, 2019 at 9:52 AM
    #6
    Bigcheeze45

    Bigcheeze45 [OP] New Member

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    Well..its a 4 cylinder 2.5 . So that right there is another check mark in the con..lol.
     
  7. Apr 2, 2019 at 8:28 PM
    #7
    JKBob 25

    JKBob 25 Well-Known Member

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    Welcome @Bigcheeze45 . Swapped motors and sensors. And still an isssue. I wouldn't just walk away from this one....I'd run. Seller can not be trusted IMO.
     
    aggrex likes this.
  8. Apr 3, 2019 at 12:27 AM
    #8
    Bigcheeze45

    Bigcheeze45 [OP] New Member

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    Way ahead of ya. Lol.
    Thanks everybody for the replies.
     
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