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2001 Buick Park Avenue Engine knock

Tiny
OLDMECH
  • MEMBER
  • 2001 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 87,000 MILES
On lite acceleration loud! Knock.
on accel in 4th od no noise
sounds like a rod or main but, car was driven 2300 miles on the road at speeds of 70-80 mph.
Engine was wot many times to 5600 rpm.
no metal in oil.
Checked fly w for cracks'
checked for loose bolts
checked converter bolts
Noise is load sensitive
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Thursday, February 7th, 2008 AT 3:18 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Check the harmonic balancer. Is this a 3.8 l? They went through them for some reason. If it is the problem, I suggest a new OEM crank angle sensor while you are in there, it is behind the balancer
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Friday, February 8th, 2008 AT 7:47 AM
Tiny
OLDMECH
  • MEMBER
  • 2 POSTS
Forgot to mention we changed the harmonic balancer.
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Friday, February 8th, 2008 AT 10:41 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Were you able to see the center of the flexplate? Sometimes they break there and will make load sensitive noise. Sure sounds like it if there is no metal in the oil. Good oil pressure?
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Saturday, February 9th, 2008 AT 7:21 AM

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