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03-20-2019
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#1 |
 Join Date: Nov 2016
Location: Florida
Posts: 66
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Whistling noise
Hey guys, my Z just recently started to get a whistling noise. It only really happens when the car is warmed up and gets louder when I hit the gas. Any ideas?
Sent from my iPhone using ZR-1 Net Registry |
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03-20-2019
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#2 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,376
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Re: Whistling noise
Vacuum leak.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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03-20-2019
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#3 | |
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Join Date: Nov 2016
Location: Florida
Posts: 66
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Re: Whistling noise
Quote:
Yep, just checked the MAP sensor lines and all was good. I fear I may have to pull the plenum again. Will most likely get rid of the secondaries and do the coolant bypass once Im in there. Sounds like its coming from this general area. Will have to investigate further. IMG_7940.jpg Sent from my iPhone using ZR-1 Net Registry |
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03-20-2019
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#4 |
 
Join Date: Apr 2007
Location: Northern VA
Posts: 2,647
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Re: Whistling noise
Ive had mis-aligned air horn bellows hose clamp come in contact with the AC pulley make a similar high pitch noise to a vacuum leak.
Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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03-20-2019
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#5 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,856
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Re: Whistling noise
The alternator can make a whine or whistle (I guess). Hard to say without hearing it.
H 
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-20-2019
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#6 |
Join Date: Aug 2004
Location: Spring Grove ,Pa.
Posts: 251
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Re: Whistling noise
This is interesting. Not long after Carlisle this year my car started to make a whiny kind of noise. My car has no secondary as Marc H did one of his 510 packages. It's not a vacuum leak as the idle has been checked and Marc said it's ok. I checked the bellows clamp and that is ok also. Not sure what else it could be though. I think the idle was around 770 but Haibeck said that wasn't all that out of line. To me it sounds like the driver side area of the plenum but it's hard to tell really.
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91 Turquoise Metallic Haibeck 525 #0134 |
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03-20-2019
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#7 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,670
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Re: Whistling noise
A vacuum leak would very likely cause an oscillating idle. And it would idle higher.
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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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03-20-2019
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#8 | |
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Join Date: Nov 2016
Location: Florida
Posts: 66
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Re: Whistling noise
Quote:
Idles at about ~800 when cold but “searches” for a bit when Im coming to a stop and put the clutch in. When it warms up the idle can be quite erratic. Check engine light also comes on and off at times. Gonna have to put a piece of cardboard up to the airhorn and see if the engine stalls out tomorrow. Sent from my iPhone using ZR-1 Net Registry |
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