1994 Geo Metro Howling, Whining noise from the engine

Tiny
DOUGLAS RATHBURN
  • MEMBER
  • 1994 GEO METRO
Noises problem
1994 Geo Metro Front Wheel Drive Automatic 46000 miles

There is a whining, howling noise at a fast idle and any higher RPM. It sound like it is coming from the passenger side of the engine. I changed the alternator and checked the water pump, turning it by hand with the belt off. I had the old alternator bench tested(after the fact) and its OK, no noisy bearings as I first thought. The noise starts after the car warms up for just a short minute. I can also hear the noise when I'm driving at slower speeds. There are no check engine light or any other lights on. With only 46,000 miles on the car why is it making this noise.
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Thursday, August 26th, 2010 AT 10:59 PM

4 Replies

Tiny
KHLOW2008
  • EXPERT
Hi douglas rathburn,

Thank you for the donation.

Noise problems are never easy to diagnose online and it is best to get someone who is able to have a visual inspection.

Whining/howling noise are usually caused by bearings and apart from the alternator, there is the A/C compressor clutch bearing. Get it checked.
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Friday, August 27th, 2010 AT 12:18 PM
Tiny
DOUGLAS RATHBURN
  • MEMBER
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Friday, August 27th, 2010 AT 10:18 PM
Tiny
DOUGLAS RATHBURN
  • MEMBER
The Metro is the base model and it doesn't have AC so is there anything else you can think of that might be causing the noise. Thanks
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Friday, August 27th, 2010 AT 10:28 PM
Tiny
KHLOW2008
  • EXPERT
Get a rubber hose and use it as a stethoscope to try to lacte the noise, especially from the alternator.

To confirm if the noise ie related to the alternator or drive belts, remove the drive belt and start engine. If the noise goes away, then it is related to the alternator. Spin the alternator to see if you can feels any coarseness in the alternator. Sometimes the alternator has to be removed to be tested ad minor coarseness in the bearings might not be felt when alternator is installed on engine.

If noise is still present after removal of the alternator belt, then the timing belt tensioner bearing might be the cause.
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Saturday, August 28th, 2010 AT 12:53 PM

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