Whistle on startup - ZR-1 Net Registry Forums

SteveCanyon · 05-22-2015

I am getting a loud whistle when I start my car for the first start of the day. Almost sounds like a supercharger whistle if that makes sense. Goes away after about a minute. The only thing I have changed is the coolant, wondering if there is some air in the system that is cycling out? Any other ideas?

Franke · 05-22-2015

I wonder if it could be your A.I.R. pump running. It runs to help bring the cats up to temp etc. then shuts off.

QB93Z · 05-23-2015

Can you tell where the sound comes from? Left or right, front or back? The AIR system is a likely candidate, but it runs every time you start the engine. You mentioned the noise happens on the first start of the day.

If you think it is coolant related, start the car with the coolant cap off, but don't run it too long that way.

Does it make a difference if the clutch is in or out?

Jim

SteveCanyon · 05-23-2015

No change with the clutch. I will try to get some video and will try pulling the radiator cap too.

BigJohn · 05-23-2015

That's funny, mine has always made that sound!

secondchance · 05-23-2015

Try starting with AC turned off. If that stops the noise its refrigerant noise.

SteveCanyon · 05-23-2015

Quote:

Originally Posted by secondchance

Try starting with AC turned off. If that stops the noise its refrigerant noise.

Does it without the AC on.

SteveCanyon · 05-23-2015

Quote:

Originally Posted by BigJohn

That's funny, mine has always made that sound!

It might be normal, just curious what is causing it.

Arctic91 · 05-23-2015

AIR system most likely... same with my '91. You can probably feel the pump vibrating when it's operating and change when it turns off.

Scott

Jagdpanzer · 05-23-2015

To bad Bogie isn't still with us. A lot of us remember how well he handled incounters involving whistles.
https://www.youtube.com/watch?v=MheNUWyROv8

05-22-2015	#1
SteveCanyon Join Date: Apr 2015 Location: Northwest AR Posts: 94	Whistle on startup I am getting a loud whistle when I start my car for the first start of the day. Almost sounds like a supercharger whistle if that makes sense. Goes away after about a minute. The only thing I have changed is the coolant, wondering if there is some air in the system that is cycling out? Any other ideas?

05-22-2015	#2
Franke Join Date: May 2013 Location: Beaver, PA Posts: 515	Re: Whistle on startup I wonder if it could be your A.I.R. pump running. It runs to help bring the cats up to temp etc. then shuts off.

05-23-2015	#3
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: Whistle on startup Can you tell where the sound comes from? Left or right, front or back? The AIR system is a likely candidate, but it runs every time you start the engine. You mentioned the noise happens on the first start of the day. If you think it is coolant related, start the car with the coolant cap off, but don't run it too long that way. Does it make a difference if the clutch is in or out? Jim

05-23-2015	#4
SteveCanyon Join Date: Apr 2015 Location: Northwest AR Posts: 94	Re: Whistle on startup No change with the clutch. I will try to get some video and will try pulling the radiator cap too.

05-23-2015	#5
BigJohn Join Date: Feb 2012 Location: Ledyard,CT Posts: 8,321	Re: Whistle on startup That's funny, mine has always made that sound!

05-23-2015	#6
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,726	Re: Whistle on startup Try starting with AC turned off. If that stops the noise its refrigerant noise.

05-23-2015	#9
Arctic91 Join Date: Nov 2007 Location: Sykesville, MD Posts: 371	Re: Whistle on startup AIR system most likely... same with my '91. You can probably feel the pump vibrating when it's operating and change when it turns off. Scott

05-23-2015	#10
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,649	Re: Whistle on startup To bad Bogie isn't still with us. A lot of us remember how well he handled incounters involving whistles. https://www.youtube.com/watch?v=MheNUWyROv8 __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake Last edited by Jagdpanzer; 05-23-2015 at 06:56 PM.