High pitch noise - ZR-1 Net Registry Forums

Rex Ruby · 06-19-2013

Have a high pitch noise when the engine is running.

Doesn't seem effect performance but something isn't right.

Any ideas?

scottfab · 06-20-2013

Can you localize where it's coming from? Font ? Rear?
Motor? wheels?

Well I had a "whistle" noise coming form the TB.
It ended up being some build up near the plates.
I took the bellows off and wiped them down and reapplied
grease (it facilitates full closure).
The whistle went away.

Rex Ruby · 06-21-2013

I'll check that Scott.
Noise is coming from the engine.

scottfab · 06-21-2013

If it is not a high pitched whistle but more of a metal on metal squeal then you can take paper towel core (tube) or a 2ft section of hose and use it to your ear to aim at the water pump, alternator, idler pulley, etc to try and localize it.
Get a suspect then remove the belt and turn each by hand.

If the noise goes away once the engine is warmed up then suspect the water pump. Maybe it's time to flush and put in new fluid? Or add some water pump lube? If that makes it go away then it would be wise to keep close watch for fluid drips for a while.

FU · 06-21-2013

Plenum to inj. housing vacuum leak ?

XfireZ51 · 06-21-2013

Quote:

Originally Posted by FU2

Plenum to inj. housing vacuum leak ?

Frank,

I just had this happen. Turns out my fuel rail bolts were loose. Injectors and rails could move around. That should be the resolution of my "disappearing IAC counts" at idle. So I ran the 1/2mile and Dyno that way.

DUH!

stuntmanmike · 04-01-2022

Hi guys, I?m experiencing a constant squealing noise. Does not change much with engine RPM. When you shut the motor off it continues for a couple of seconds then sort of tapers down in frequency, like a bottle rocket sound.
Do I need to pull the whole Plenum off to get access to the injector housing that may be the culprit? Thanks

XfireZ51 · 04-01-2022

Quote:

Originally Posted by stuntmanmike

Hi guys, I?m experiencing a constant squealing noise. Does not change much with engine RPM. When you shut the motor off it continues for a couple of seconds then sort of tapers down in frequency, like a bottle rocket sound.
Do I need to pull the whole Plenum off to get access to the injector housing that may be the culprit? Thanks

Yes.

Jagdpanzer · 04-01-2022

Sounds like a vacuum leak

Sent from my iPhone using ZR-1 Net Registry

06-19-2013	#1
Rex Ruby Join Date: Feb 2005 Location: Springfield, PA Posts: 372	High pitch noise Have a high pitch noise when the engine is running. Doesn't seem effect performance but something isn't right. Any ideas? __________________ John Porter '93 Ruby Coupe ZF6 - Muffler eliminators, Blink Blink kit and Polished ZR1 Wheels * PA Plate: OBSSSN '06 LeMans Blue C6 Coupe - Corsa exhaust * PA Plate: OBSSSV ZR1 Net Registry Founding Member #153 40th Anniversary Registry Member NCM Family Membership #8116 Corvette Forum NE Events Coordinator Delco Cruisers Board of Directors SAVE THE WAVE!

06-20-2013	#2
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Re: High pitch noise Can you localize where it's coming from? Font ? Rear? Motor? wheels? Well I had a "whistle" noise coming form the TB. It ended up being some build up near the plates. I took the bellows off and wiped them down and reapplied grease (it facilitates full closure). The whistle went away. __________________ Scott Vett owner since 1979._It's about the car and the people

06-21-2013	#3
Rex Ruby Join Date: Feb 2005 Location: Springfield, PA Posts: 372	Re: High pitch noise I'll check that Scott. Noise is coming from the engine. __________________ John Porter '93 Ruby Coupe ZF6 - Muffler eliminators, Blink Blink kit and Polished ZR1 Wheels * PA Plate: OBSSSN '06 LeMans Blue C6 Coupe - Corsa exhaust * PA Plate: OBSSSV ZR1 Net Registry Founding Member #153 40th Anniversary Registry Member NCM Family Membership #8116 Corvette Forum NE Events Coordinator Delco Cruisers Board of Directors SAVE THE WAVE!

06-21-2013	#4
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Re: High pitch noise If it is not a high pitched whistle but more of a metal on metal squeal then you can take paper towel core (tube) or a 2ft section of hose and use it to your ear to aim at the water pump, alternator, idler pulley, etc to try and localize it. Get a suspect then remove the belt and turn each by hand. If the noise goes away once the engine is warmed up then suspect the water pump. Maybe it's time to flush and put in new fluid? Or add some water pump lube? If that makes it go away then it would be wise to keep close watch for fluid drips for a while. __________________ Scott Vett owner since 1979._It's about the car and the people

06-21-2013	#5
FU Join Date: Mar 2004 Location: Found Member Posts: 4,346	Re: High pitch noise Plenum to inj. housing vacuum leak ? __________________ Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237

04-01-2022	#7
stuntmanmike Join Date: Jan 2014 Location: NYC Posts: 28	Re: High pitch noise Hi guys, I?m experiencing a constant squealing noise. Does not change much with engine RPM. When you shut the motor off it continues for a couple of seconds then sort of tapers down in frequency, like a bottle rocket sound. Do I need to pull the whole Plenum off to get access to the injector housing that may be the culprit? Thanks

04-01-2022	#9
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,659	Re: High pitch noise Sounds like a vacuum leak Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake