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Surging at idle

Discussion in 'Wrangler TJ (1996-2006)' started by davidcamarra, Oct 26, 2016.

  1. Oct 26, 2016 at 9:23 AM
    #1
    davidcamarra

    #1
    davidcamarra [OP] New Member

    Joined:
    Oct 26, 2016
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    First Name:
    david
    Vehicle:
    1999 Jeep TJ sport 4.0
    My 99 TJ 6cyl automatic surges when it sits at a idle in drive. Put it in park or neutral and its fine. I have replaced the TPS , and the IAC. I have had the computer bench checked by SLI in Illinois and it has come back fine.
    I'm thinking it might be the transmission or some other sensor.
    I have not had the OBD tester on it lately but when i did it came up with po 351 and po 132. The O2 sensor has been changed as well.
    When it does act up at a light or a stop after i restart it and take off the tranny is in nutural for a instant. Its like it does not know what gear it should be in or no gear at all.
    I have had it to many garages and nobody seems to have a clue. The transmission works fine any other time.
    David Camarra
     
    davidcamarra, Oct 26, 2016
    #1
  2. Oct 26, 2016 at 6:08 PM
    #2
    C2T

    #2
    C2T Well-Known Member

    Joined:
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    Richard
    Helena, Montana
    Vehicle:
    Jeep
    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    Consider the crankshaft position sensor.
     
    C2T, Oct 26, 2016
    #2
    Bob likes this.
  3. Oct 28, 2016 at 7:06 PM
    #3
    BigThunder

    #3
    BigThunder Member

    Joined:
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    Conroe, TX
    Vehicle:
    2004 TJ
    Maybe fuel pump acting up and getting more juice than needed????? Not strong on this but I have had my rpm higher at times when idle but then goes back to normal. Think something sticking. Good luck
     
    BigThunder, Oct 28, 2016
    #3
  4. Oct 31, 2016 at 10:49 AM
    #4
    davidcamarra

    #4
    davidcamarra [OP] New Member

    Joined:
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    david
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    1999 Jeep TJ sport 4.0
    Neither of those prof to be a problem
     
    davidcamarra, Oct 31, 2016
    #4
  5. Jun 26, 2017 at 9:52 AM
    #5
    Pcchadwe

    #5
    Pcchadwe Member

    Joined:
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    Member:
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    First Name:
    Phillip
    Vehicle:
    2005 TJ Rubicon
    4" lift, headers, stainless steal cat back system, 33" wheels, 9.5ti Warn winch, cold air induction, gel battery, crawler bumpers, lifted induction,
    Would have put money on the cam sensor. But those usually throw a 340 or 344 code. You may try the crankshaft position sensor. Located in a tight spot on tranny near bell housing.
     
    Pcchadwe, Jun 26, 2017
    #5
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