Jump to content
Sign in to follow this  
uncle.penny

Loud whining rises with engine RPM

Recommended Posts

Hi all!

 

2 problem posts in 1 week, I'm on a roll!

 

So I have a quite loud whining that rises with the engine speed as the title states, it's basically as loud as the engine itself. If I didn't know any better I'd think someone stuck on a supercharger running 15psi haha. I've noticed no driveability issues with it, but it's annoying and if it's something that could potentially become serious I'd rather take care of it now. The pitch doesn't change when I dry-steer so I don't think it's the PS pump, so in my head I've narrowed it down to either the water pump or alternator (while crossing my fingers that it's not the pump).

 

Anyone dealt with a whiny Path before? Is there a good trick for diagnosing it aside from using a stethoscope/long screwdriver?

Share this post


Link to post
Share on other sites

Pull the accessory belts off and spin the pulleys by hand. It is probably bad bearings on alternator, idle pulley, etc.

Share this post


Link to post
Share on other sites

Pull the accessory belts off and spin the pulleys by hand. It is probably bad bearings on alternator, idle pulley, etc.

 

I second that motion.

Share this post


Link to post
Share on other sites

I have this same issue. I believe it is the turd carquest water pump I bought.. I guess it could also be the ps pump since I’m running 68 turbine oil..

 

I hope it’s something else on yours :)

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

Going to pull the acc. belts tonight and see if there's anything funky going on with any of the spinning components, thanks for the suggestion!

Share this post


Link to post
Share on other sites

It could also be a bad fan clutch. Mine spins all the time and makes a ton of noise. Cruising at a steady speed it will fade in and out in volume but always makes some noise. I thought I was the timing belt at first but it's too inconsistent.

Share this post


Link to post
Share on other sites

I'm 99% sure it's not the fan. I used to have an '88 300ZX with the VG30E in it with a seized fan clutch so I know exactly what that sounds like haha. Made a 2 seater sports car sound like a semi truck any time you'd take off from a stop.

Haven't had the chance to check accessories yet, probably going to leave it until Sunday to try and narrow it down. I have a sneaking suspicion it's the water pump even though I'm hoping it isn't.

Share this post


Link to post
Share on other sites

I'd say its probably the alternator, or the idler pulley for the AC.

Share this post


Link to post
Share on other sites

Which pulley is it that's dead centre between the cylinder banks at the top? Without even taking the belts off I just felt around and that pulley had quite a lot of play in it.

Share this post


Link to post
Share on other sites

Mine was a bad idler pulley, simple to replace

Share this post


Link to post
Share on other sites

Which pulley is it that's dead centre between the cylinder banks at the top? Without even taking the belts off I just felt around and that pulley had quite a lot of play in it.

 

Air conditioner idler pulley. Sounds like you found your problem!

Share this post


Link to post
Share on other sites

I actually had a similar problem with one of my own accessories. I bought a belt online from Amazon and it said it would fit the A/C pulley, but after i put it on it sounded like I had installed a supercharger. Turns out that the belt was so tight the tensioner pulley in the middle was so tight i couldn't adjust it.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

Welcome to NPORA Forums

 

Please REGISTER to gain full access to the forum.

Make sure you read the Forum Guidelines and don't forget to post a new intro in the New People Start Here! section, to say hi too everyone.

 

-NPORA

×