ENGINE NOISE

  • Tiny
  • joey737396
  • 1999 Chevrolet Astro
  • 6 CYL
  • 4WD
  • automatic
  • 170,000 miles

What causes the valves to knock

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Saturday, December 25th, 2010 AT 8:34 PM

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  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,409 posts

If you have a bad valve ping, it can be caused by cheap low octane fuel, a bad knock sensor, or a timing issue.

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Sunday, March 13th, 2011 AT 3:28 AM

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