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Knocking and pinging

Discussion in 'GM Powertrain' started by twotone guy, Aug 8, 2010.

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  1. twotone guy

    twotone guy New Member

    its knocking and pinging on 93 octane,and a fresh tune up ...I NEED HELP!!!:neutral:ITS A 91 4.3 silverado...135xxx miles...
  2. hundojoe

    hundojoe Rockstar 100 Posts

    Was it doing this before the tune up? If not double check the firing order.
  3. twotone guy

    twotone guy New Member

    yea man, this was why i did the tune up ..
  4. hundojoe

    hundojoe Rockstar 100 Posts

    ok just asking, gotta start some where, have you checked the fuel pressure?
  5. twotone guy

    twotone guy New Member


  6. hundojoe

    hundojoe Rockstar 100 Posts

    A filter change never hurts, but it still helps to know what your fuel pressure is at before, so you can see what its at after. Also check the wiring at the knock sensor, I do know that the fuel injection spider can be a problem on the motors, but im not sure it that will cause pinging and knocking.

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