engine has a steady knock

2002 TOYOTA HIGHLANDER
125,000 MILES
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BENNYJ
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  • 2 POSTS
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.
Aug 27, 2011 at 10:13 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Check the crankpulley, note if it is moving in a wavy manner. If yes, the harmonic damper is bad.
Aug 28, 2011 at 4:32 AM
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BENNYJ
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  • 2 POSTS
Is it something that can be driven with to the shop or am I going to have to have it towed? 5 mile drive?
Aug 28, 2011 at 1:51 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
If the damper is not waving too badly, it is still driveable but do not turn on the A/C if you must.
Aug 28, 2011 at 5:11 PM
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