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  1. #1

    Default Spark knock epidemic

    My all original 87 w/ 350TBI recently started spark knocking even under mild accelleration.
    I'm scared it will self destruct under moderate to hard throttle. Had garage check for bad
    knock sensor and faulty EGR valve but they are OK. Also began using mid-grade gas with no
    improvement. Even high-test didn't help. Anyone have any suggestions?

  2. #2

    Default

    Sorry, but my signature didn't display with my post about my spark knock problem.
    Hope this works.
    87 Silverado 3/4 ton LB 4x4 350 TBI 700 R4 2 1/2" duals no cats 129,000 miles

  3. #3

    Default

    Pinging can be caused by carbon build-up. Run some Sea-Foam thru the engine and then give her a tune-up.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

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