Noise when cold
Thread Starter
5th Gear
Joined: Apr 2013
Posts: 5
Likes: 0
From: Lake Stevens Washington
Noise when cold
OK so I have a 2000 C5 convertible with 40,000 miles, I have noticed that when I pull it out of garage and leave down the street it makes kind of a rubbing noise like a metal rub every revolution so not constant. If the car just warms up to operating temp. the noise still remains when I leave, always under load never when idleing or reving motor. Now when I get it on the road and put my foot into it the noise goes away and does not come back until the next morning. Weird, anybody got ideas what to look for?
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Brakes have a natural drag on the rotors and sometimes can cause a sound when going slow and are cold, You can try a few high speed stops and see if that helps.
Le Mans Master
Joined: May 2006
Posts: 5,814
Likes: 414
From: Pittsburgh suburbs Pa.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Aug 2007
Posts: 4,506
Likes: 0
From: This is not a Song, It's an Outburst: Or, The Establishment Blues; Sixto Diaz Rodriguez
Rear differential? If it's a grinding, chattering noise, it's normal. It that's it change out your diff fluid, (I suggest Amsoil) with limited slip additive. 
Thread Starter
5th Gear
Joined: Apr 2013
Posts: 5
Likes: 0
From: Lake Stevens Washington
I will check the diff. fluid, 40000 miles probably should be changed. Don't think that is it but worth a shot. Hard to tell when the noise goes away after accelerating and doesn't come back till next day. Need to find Dyno to put it on and run it so I can pin point better
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Doesn't sound like it is diff chatter which would occur when doing sharp turns - yours sounds like it occurs going straight. Unfortunately, could be a lot of things including torque tube, wheel bearings, brake rotor/pad rub as mentioned above. I'd check the torque on your rear axle nuts as a starter. If it goes away, I'd guess most likely cause is brake rotor/pad rub which is only an annoyance but nothing physically wrong. You know what kind of pads you have? Good luck! 
__________________
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)