Question about Chevrolet Chevy
I have a '99 Chevy Lumina 3100 V6 with 54k miles. There is a high- pitch buzzy whine that changes pitch with engine RPM/transmission speed. I removed the serpentine belt and drove it briefly - the noise is still there without the belt. So it's not the power steering pump, alternator, H20 pump or belt tensioner. Transmission has had regular service, and shifts smoothly in all gears. The noise is only evident while moving (forward or reverse) above 5 mph. There is only a slight raspy "scraping" noise in park or neutral, which becomes almost undetectable when shifting to drive or reverse with the brake still applied.
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Posted on Jan 02, 2017
Run the car from the top of a hill and let it coast at your whining speed. Put it in Neutral, does the whine disappear?
If not its in the drivetrain (wheels, driveshafts, tranny)
Very unlikely to be the timing belt. If it appears at a fixed speed then its drivetrain, if it whines at fixed revs its the engine.
Most likey the transmission I fear....Tires will also make loud whining noise too though...
Posted on Jan 09, 2009
Check for vacuum lines going to transmission or any vacuum line under hood. It is possible an animal chewed on the lines or wires. We get a few reports of that at Fixya.
You might also look under the dash by the pedals for a vacuum leak. There are vacuum switches for parking brake release and the neutral start switch.
Posted on Oct 06, 2009
SOURCE: 99 Grand Am. No reverse
Hello and welcome to FixYa!
Looks like a faulty torque converter to me. If the torque converter is faulty, it shifts hard or may stay on a certain gear. Reverse can be affected too. I strongly suggest that you have a torque converter replacement if that's the case.
Before going to torque converter replacement, please do check the transmission fluid. If it looks or has a burnt smell then it can be the issue too. Burnt fluid may cause irregularities on transmissions operation. If that's the case then go for the fluid replacement first and if it still fails then it's time to have a new torque converter.
Hope this helps and thank you for using FixYa! Have a good one!
Posted on Jul 16, 2011
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