Whirring/whistling noise from engine...

Trefty · Jun 27, 2005

My engine is making a whirring/or whistling noise when idiling and when I shut the engine off it makes a howling noise for about 5-10 seconds. I checked the fan and had it not spinning and it still made this noise. It almost sounds like it's coming from the back of the engine or perhaps inside the engine. Anyone have any ideas what it could be????

ECU5.0 · Jun 27, 2005

hows the oil pressure? is the starter disengaging? have someone start the car while you have the hood popped and than have them cut the car off and see if it is still turning over with the motor off

Trefty · Jun 27, 2005

Oil pressure is good and the starter is disengaging.

ECU5.0 · Jun 27, 2005

maybe the fuel pump? its hard to diagnose without hearing it

Trefty · Jun 27, 2005

ECU5.0 said:
maybe the fuel pump? its hard to diagnose without hearing it

Yea, fuel pump is kind of what I had in mind too, but would the car still be getting enough fuel? It's idling fine still, aside from the noise.

I'll try to get a sound clip of the file maybe by tommorow.

JerryDaugherty · Jun 27, 2005

Maybe the gasket between the upper and lower might not be sealed, the pcv valve hose might have slipped to let some air escape, ot the fuel rail hasnt seated on one of the injectors all the way. In my experience those are all things that make a whine or whistle. good luck

Trefty · Jun 27, 2005

JerryDaugherty said:
Maybe the gasket between the upper and lower might not be sealed, the pcv valve hose might have slipped to let some air escape, ot the fuel rail hasnt seated on one of the injectors all the way. In my experience those are all things that make a whine or whistle. good luck

Thanks, I'll make sure I check those tommorow morning. I did remove my upper intake about 2 months ago to poilish it, perhaps I didn't bolt it down hard enough.

HISSIN50 · Jun 28, 2005

Do you have a mech fan? How do you get it to stop spinning? WHen motor mounts go south, the fan can hit the bottom of the fan shroud.

Good luck.

Trefty · Jun 28, 2005

HISSIN50 said:
Do you have a mech fan? How do you get it to stop spinning? WHen motor mounts go south, the fan can hit the bottom of the fan shroud.

Good luck.

It's the stock clutch style fan. To get it to stop spinning I just removed the fan belt and let the car idle for a bit, to check if it was any of the belt driven accessories that was making the noise, but it wasn't.

Trefty · Jun 28, 2005

JerryDaugherty said:
Maybe the gasket between the upper and lower might not be sealed, the pcv valve hose might have slipped to let some air escape, ot the fuel rail hasnt seated on one of the injectors all the way. In my experience those are all things that make a whine or whistle. good luck

Checked the gasket between upper and lower, it's fine, same with the fuel rail. Stupid question, but where is the pcv valve located?

Also, I pinpointed the noise and it sounds like it is coming from the intake manifold. When I shut off my engine I get the whine for about 5-10 seconds, then it almost sounds like there is air escaping from either the upper manifold or maybe one of the hoses below it. Anyway, that's what I'm going to check next.

Trefty · Jun 28, 2005

Well, I figured out the problem, turns out that it was my power brakes booster that was creating the problem by causing a vacuum and sucking in air. I knew I had a problem with the booster but didn't think it was also causing this whining noise. Anyway, thanks to all for your help suggestions.

just4bob50 · Jun 28, 2005

Ive had the same prob for almost 2 years now. Ive had 2 different intakes on with all new gaskets and hose's. what was actually wrong with your brake booster and how did you fix it. oh yeah what did it cost.

HISSIN50 · Jun 28, 2005

It can be normal to hear compression bleed off also.

Good luck.

Trefty · Jun 28, 2005

just4bob50 said:
Ive had the same prob for almost 2 years now. Ive had 2 different intakes on with all new gaskets and hose's. what was actually wrong with your brake booster and how did you fix it. oh yeah what did it cost.

When I use the brake I can hear air escaping, coming from the brake booster. I haven't had it fixed yet, that's happening next Thursday, but the mechanic said it sounds like the power brake booster has a leak and is sucking in air, and when I shut the engine off the whining noise im hearing is that air being bled off. It's gonna cost me $200 for parts and labour.

Deleted member 87397 · Jun 28, 2005

I have the whirring whistling noise too after my engine warms up a bit. Started doing it after my intake manifold swap and CAI install. I've been over everything and can't find it. Maybe my booster is having trouble too.

Trefty · Jun 28, 2005

Mine was fairly easy to diagnose because my car runs perfect except for the power brakes, just tapping on them lightly and I could hear the air escaping from the booster. Check your brakes, if you hear a faint "whooshing" noise, like when you expel air from an air mattress, then it's likely your booster that needs to be replaced.

I also thought it was my intake at first, almost convinced the noise was coming from there, but checked it all out and it's fine, just hard to know exactly where noises are coming from under the hood.

Good luck, hopefully this helps.

Cobra1894 · Jun 28, 2005

The noise after shutting off just started on my car. I'll check the Brake booster. I just had my AC worked on, replaced the Accumalator and hose, so I thought it was something to do with that.

darthcual · Jun 28, 2005

whirring whistle noise. sounds like a turbo grew in your engine. REJOICE, rejoice, its immaculate power adder conception

darthcual · Jun 28, 2005

Wait wait i just had another thought. Noisy Gears? you know the replacement for timing chain. Hallelujah for immaculate noisy gears conception!!!

savegoodautonfg · Jun 5, 2006

Trefty said:
Well, I figured out the problem, turns out that it was my power brakes booster that was creating the problem by causing a vacuum and sucking in air. I knew I had a problem with the booster but didn't think it was also causing this whining noise. Anyway, thanks to all for your help suggestions.

I'm wondering if this my problem im having with the leak from the upper intake manifold. how do i check for the power brake booster having a problem and where is it?

Whirring/whistling noise from engine...

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