Question about 2003 Toyota Sienna

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Constant high pitched whining noise. Increases

Constant high pitched whining noise. Increases and decreases with changes in engine RPM.

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When you are driving, park, or all the time?

Posted on Feb 11, 2019

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Checked. Fluid and it says its good but still squeling loud and feels like a brake is on

Posted on Feb 11, 2019

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You could be low on transmission fluid check that and make sure it registering properly on the dipstick.

Posted on Oct 20, 2009

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Posted on Jan 02, 2017

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This could be anything from the pump in the transmission to the alternator bearings/bushings to the power steering pump. Could be an idler pulley bearing, but I doubt it.
Hint: If the noise is very high-pitched, check the alternator. If it is a lower, medium-high-pitch sound that changes some when you turn the wheels, check the power steering pump. If it is almost like a moan or a "Whooo" sound, that's the transmission pump.

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You didnt indicate whether you ran the engine with the belt removed while replacing the alternator,if not do so and verify noise. Sounds like you may have a vacuum leak, best way to diagnose would be with a smoke machine if not available with the engine cold try spraying carb cleaner around the intake & any suspect vacuum hoses with engine idling look for a change in idle speed or elimination of noise. Hope this helps you out

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1 Answer

1995 Subaru Impreza WRX engine problem


Alternator?
Voltage Regulator?

If the noise sounds like a weeeeeee that increases in pitch as the RPMs increase, and you haven't heard this sound before the 'problem', suspect the alternator...

Mar 12, 2009 | 1995 Subaru Impreza

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