whine noise under throttle

[aeroresh]

For the last few days my car has developed a whining noise (and its not the wife before someone says!) similar in sound to a supercharger when accelerating. Definately coming from the engine rather than drivetrain as it does it when revving the engine in neutral.

It quite loud and although sounds cool in a superchargery kind of way there's obviously something amiss!

Any thoughts?

[DinanX5]

Had a similar noise recently... my Dinan guy (Motor Works West) thought it was some sort of fluid-starved pump, and told me to let the dealer take care of it under warranty. The master tech at my dealer initially made the same diagnosis, and replaced a pump (forget which one), but the noise continued... turned out to be the alternator.

[noncom23]

Originally Posted by DinanX5

Had a similar noise recently... my Dinan guy (Motor Works West) thought it was some sort of fluid-starved pump, and told me to let the dealer take care of it under warranty. The master tech at my dealer initially made the same diagnosis, and replaced a pump (forget which one), but the noise continued... turned out to be the alternator.

Lots of posts about this. I for one would love to know what pump was replaced. Thanks.

[DinanX5]

I'll try to remember to check my paperwork tonight...

[noncom23]

Originally Posted by DinanX5

I'll try to remember to check my paperwork tonight...

Thanks.

[aeroresh]

Whining is from the viscous fan! There's a relief

[noncom23]

Thanks for the update!

[supersteve]

Sounds like it could be just your belts or even a small vacum leak. Remember, they will probably change your $50 belts saying they might as well since they were off to change your $650 altenator. How many miles on your X?

[2002Silver4.6is]

Originally Posted by aeroresh

Whining is from the viscous fan! There's a relief

Did you have to have the fan replaced?? is the "viscous fan" just the normal engine cooling fan??

I am having exactly the same issue you were. When I accelerate hard I get a sound similar to a supercharger.....

[mahermahmood]

I am having the same sound. I had my waterpump, belts and thermostate changed and still getting sound. I am thinking altenator at this point. But I am not going to change until I have a problem. How hard is it to change a altenator in a 3.0 x5, 2001.