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Spark knock epidemic

Discussion in 'Performance & Fuel' started by 874x4, Mar 8, 2012.

  1. 874x4

    874x4 New Member

    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. 874x4

    874x4 New Member

    Sorry, but my signature didn't display with my post about my spark knock problem.
    Hope this works.
  3. Boonduff

    Boonduff Member 3 Years 100 Posts

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

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