Quote:
Originally Posted by Berty_K
Hoping someone can help me diagnose an engine whine.
The video below isn't mine, but my engine whine is identical. The whine becomes especially clear around 13 seconds into the video.
Fj Cruiser Throw out Bearing Whine - YouTube
The YouTube poster claims the whine is from a throwout bearing in his manual transmission. I don’t have a manual.
Has anyone had or solved a similar whine?
I’m thinking idler/tensioner pulley. Already replaced my alternator.
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Whine can be many different things. Pull the belt off and spin the pulleys by hand.
The bearing in the alternator and AC compressor are pretty common across all makes of vehicles. The issue is underhood noises bounce off of everything and can be hard to track down. Since you already did the alternator (presumably recently, let's assume it's not that for now)...
Another VERY common source of whine is the Power Steering pump. If the reservoir is low it will be sucking in air and causing aeration of the fluid which will whine horribly. Dirty fluid (even if full) can cause it to whine as well. There are various methods to flush the system, and I really like Wynn's fluid and conditioner if you are able to get some where you are.
If nothing makes noise or feels "crunchy" with the belt off spinning them by hand go ahead and put it back on.
Take a long screwdriver or prybar, or a stethoscope if you have one... place the end on each component (not a part of it that moves!) and put the other end to your ear. See which one makes the same noise or appears the loudest.
You can try things like cycling the AC on and off to see if it affects the noise. IE the compressor clutch failing.
Report back and let us know what you find. Good luck!