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#1 |
![]() Join Date: Feb 2005
Location: Springfield, PA
Posts: 372
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Have a high pitch noise when the engine is running.
Doesn't seem effect performance but something isn't right. Any ideas?
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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! |
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#2 |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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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.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#3 |
![]() Join Date: Feb 2005
Location: Springfield, PA
Posts: 372
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I'll check that Scott.
Noise is coming from the engine.
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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! |
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#4 |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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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.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#5 |
![]() Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Plenum to inj. housing vacuum leak ?
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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#6 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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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!
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#7 |
Join Date: Jan 2014
Location: NYC
Posts: 28
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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 |
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#8 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#9 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,652
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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