ENGINE HAS A STEADY KNOCK

  • Tiny
  • BennyJ
  • 2002 Toyota Highlander
  • 125,000 miles

As driving around 25 mph, heard sound as if something fell down below the car. A knocking sound immediately began after that. Any ideas? On further investigation it seems like the sound is coming from the general area of the belts but not created by the belts. As the car idles it is a steady knock but if you rev the engine or put it in gear the sound speeds up or slows down depending on the engine RPM and auto-clutch.

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Saturday, August 27th, 2011 AT 10:13 PM

3 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Check the crankpulley, note if it is moving in a wavy manner. If yes, the harmonic damper is bad.

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Sunday, August 28th, 2011 AT 4:32 AM
  • Tiny
  • BennyJ
  • Member

Is it something that can be driven with to the shop or am I going to have to have it towed? 5 mile drive?

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Sunday, August 28th, 2011 AT 1:51 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

If the damper is not waving too badly, it is still driveable but do not turn on the A/C if you must.

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Sunday, August 28th, 2011 AT 5:11 PM

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