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Hissing and popping from the motor?

Discussion in 'General Jeep Discussion' started by Adam39601, Jan 29, 2018.

  1. Jan 29, 2018 at 6:57 AM
    #1
    Adam39601

    #1
    Adam39601 [OP] Well-Known Member

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    On my 2001 Jeep Wrangler 4.0 when I'm in neutral I hear a missing and a popping from the motor what do you think it might be
     
    Adam39601, Jan 29, 2018
    #1
  2. Jan 29, 2018 at 7:29 AM
    #2
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    When was the last time the plugs/coils were changed?
    Maybe a clogged fuel injector?
    Though I would imagine you would get a Check Engine light with those....
     
    Prerunner1982, Jan 29, 2018
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    JKBob 25, Bob and chris4x4 like this.
  3. Jan 29, 2018 at 10:08 AM
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    Offroad798

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    Offroad798 Well-Known Member

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    Not sure what you mean by hissing. This to me usually means a vacuum leak. Not sure about the popping noise. Fuel injectors can make a ticking sound. If as Prerunner1982 is saying could be wires if you are hearing an arcing sound. Could you narrow the location down a little more. You can use electronic headphones or the standard heater hose a couple of feet long. Put to your ear and move around the engine to locate the noise or the general area of the sound. Does this happen ( hissing) when your foot is on the brake pedal? As you can see there is a lot to look at so any extra info would help me to help you look at the correct area. Do a visual inspection of the engine to see if you notice anything out of the ordinary. Or if you just had recently done any work.
     
    Offroad798, Jan 29, 2018
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  4. Jan 30, 2018 at 8:31 AM
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    Adam39601

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    Adam39601 [OP] Well-Known Member

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    I'm thinking I'm going to change my coil pack an plugs first think its the original pack . check engine lo ight is on , said one cylinder miss fireing
     
    Adam39601, Jan 30, 2018
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    JKBob 25 and Prerunner1982 like this.
  5. Jan 30, 2018 at 9:17 AM
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    OFFGRID

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    OFFGRID Well-Known Member

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    Sounds like you might have a bad fuel injector. Did it tell you which cylinder it is? If so try switching 2 injectors and see if the problem moves to a new cylinder. A while back we had a similar write up in the forums and it was a bad injector.
     
    OFFGRID, Jan 30, 2018
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  6. Jan 30, 2018 at 4:58 PM
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    Adam39601

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    Adam39601 [OP] Well-Known Member

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    Thanks will do
     
    Adam39601, Jan 30, 2018
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    JKBob 25 likes this.
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