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1999 Toyota Camry Engine makes a humming sound when driving

Tiny
FREDERICKG
  • MEMBER
  • 1999 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 116,200 MILES
My engine makes a loud humming sound that gets loudest between 30 and 40 mph. Above 40 mph the hum quiets down a bit. The engine does not make the sound while idle. The sound appears to be coming from the left side of the engine. This issue started a few weeks after I had my water pump and timing belt replaced. I'm not sure if the issue is related to this repair but I wanted to include it just in case. I have heard that humming can be caused by a faulty PCV valve. My PCV valve was replaced about 20K miles ago. Would it be worth replacing this?
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Thursday, September 17th, 2009 AT 2:02 PM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Its in the engine and not the wheels !

Try to put a pressure on the steering wheel little to the left and then to the right if sound change
suspect wheel bearing

also another possible the idler tensioner for the T belt may be defective
but most the time you can hear it when reving up engine in neutral /park
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Friday, September 18th, 2009 AT 8:19 PM

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