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Thread: knock sensor

  1. #1
    Join Date
    Dec 2011
    Location
    downers grove
    Posts
    2

    knock sensor

    I have 1999 GMC Seirra 1500 5.3 sle and the serice engine light came on. i check the obd and it said it was my knock sensor number 2. Question, is it tough to do. Question 2 i went to auto zone and they couldnt get it anyone know were to get it, or is a dealer only thing.

    thanks josh

  2. #2
    Join Date
    Nov 2011
    Location
    Arlington, Tx
    Posts
    416
    i have bought them at oreillys before. they arent the easiest thing to do but its not too bad. you have to remove the intake.
    PERFORMANCE-TUNING-FABRICATION
    12617 FM 917
    Alvarado, TX 76009

  3. #3
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,689
    be sure that when you do replace them that you don't put loctite on them and 100% for sure use a torque wrench when tightening so you don't screw them up or get errant readings. If you had corrosion on your old sensor connectors or harness get a new knock sensor harness from the dealer.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #4
    Join Date
    Aug 2009
    Location
    venice, florida
    Posts
    231
    got mine off ebay, knock sensors and harness.
    5.3 2wd upgrades: Nelson tune, stainless lt's, magnaflow, e-fans, msd's, cai.

  5. #5
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,441
    They have it at Autozone, they just weren't looking it up right (big surprise) Part # SU1282

  6. #6
    Join Date
    Dec 2011
    Location
    downers grove
    Posts
    2
    sweet thanks yeah he kept saying its was a delaer part possibly

  7. #7
    What causes them to go out. Ive replaced mine twice and getting ready to be a 3rd time tomorrow ive done it in the past 2 years

  8. #8
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,441
    Quote Originally Posted by whitelightin05 View Post
    What causes them to go out. Ive replaced mine twice and getting ready to be a 3rd time tomorrow ive done it in the past 2 years
    Moisture causes the sensors to corrode. The stock rubber boot doesn't adequately seal the hole they are in, water gets in and can't evaporate out.
    When you replace the sensors clean the holes really well, then dry them out using alcohol. Seal the boots with RTV and I always remove the foam pieces at the ends of the intake.

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