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Loud whining rises with engine RPM


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10 replies to this topic

#1 OFFLINE   uncle.penny

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Posted 05 February 2018 - 04:08 PM

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?



#2 OFFLINE   Citron

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Posted 05 February 2018 - 05:47 PM

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

#3 OFFLINE   OH6PILOT

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Posted 05 February 2018 - 06:22 PM

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.



#4 OFFLINE   onespiritbrain

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Posted 05 February 2018 - 07:25 PM

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 :)


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#5 OFFLINE   uncle.penny

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Posted 07 February 2018 - 10:27 AM

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!



#6 OFFLINE   Zkingcyrus

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Posted 07 February 2018 - 12:00 PM

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.

#7 OFFLINE   uncle.penny

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Posted 09 February 2018 - 09:12 AM

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.



#8 OFFLINE   adamzan

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Posted 09 February 2018 - 09:33 AM

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



#9 OFFLINE   uncle.penny

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Posted 10 February 2018 - 02:50 PM

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.



#10 OFFLINE   k9sar

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Posted 10 February 2018 - 04:00 PM

Mine was a bad idler pulley, simple to replace



#11 OFFLINE   Slartibartfast

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Posted 10 February 2018 - 07:35 PM

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!






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