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2001 TAHOE PINGING WITH 93 OCTAINE WHY? - Tahoe Chevrolet Cars & Trucks

Posted by EDGARV73 on

  • EDGARV73 Aug 08, 2008

    SOUNDS just right but no mil illuminated or code yet. could it still be a knock sensor going bad? and whats the price to fix it??



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alex metro

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  • Chevrolet Master
  • 364 Answers

Your rear knock sensor is probably going bad.

Does this discribe your problem? :

  • mild to severe engine ping, usually worse during acceleration and/or an illuminated MIL
if it does, take a look at this TSB issued by GM:

#02-06-04-023A Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set

Posted on Aug 07, 2008

  • alex metro
    alex metro Aug 10, 2008

    pinging can be caused by too much ignition advance, low octane fuel, carbon build up on valves, malfuntioning knock sensor.

    the ignition timing is computer controlled, if the knock sensor detects knock(ping) , the PCM retards the igniton timing.

    -a bad knock sensor is the most probable cause.

    if you do the repairs yourself, the parts will cost right around $100 from autozone (intake manifold gasket, knock senor, RTV) and will probably take you 3-5hrs.

    if you take it to a shop. you will be charged for 2.2hrs of labor (if they charge you for more hours, they are ripping you off) @ $80/hr (average rate) = $176

    they usually mark up the parts atleast 2.5X and depending on where the parts were purchased cost between $100 and $170.

    So i would estimate the average price you would pay @ $500

    you could try de-carbonizing the engine first as this is a less possible cause. How? i would suggest BG 44K® Power Enhancer®

    to find a distributor CLICK HERE



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