[Z06] Back Fire Through the Exhaust
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,581
Likes: 966
From: Communist Colorado
Back Fire Through the Exhaust
I just did my clutch job and I think I may have cracked a plug while the header was off. I didnt pull the plugs, and I dont know for sure.... but Im thinking I screwed up one of the plugs letting the header hit one of the plugs while doing the clutch. Would this cause a back fire through the exhaust?
Also, when I have the clutch in, just sitting, theres a noticeable whine sound.... All the parts are new, pilot, throw out brg, flywheel, disc & pressure plate. Pedal feels perfect, gear changes are excellent..... any idea why a breand new throw out brg might sing? No sound when the clutch is not pressed down.
Also, when I have the clutch in, just sitting, theres a noticeable whine sound.... All the parts are new, pilot, throw out brg, flywheel, disc & pressure plate. Pedal feels perfect, gear changes are excellent..... any idea why a breand new throw out brg might sing? No sound when the clutch is not pressed down.
Last edited by 81c3; Mar 1, 2011 at 10:25 PM.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,581
Likes: 966
From: Communist Colorado
Premium Supporting Vendor
Joined: Aug 2004
Posts: 496
Likes: 14
From: Phoenix AZ
Yes, a cracked plug could definitely cause a misfire and backfire out the exhaust.
As for the whine it may just be that the new TO bearing was a little tight and will loosen up as it breaks in. I would just keep an ear out and see if it gets louder or not before doing anything.
As for the whine it may just be that the new TO bearing was a little tight and will loosen up as it breaks in. I would just keep an ear out and see if it gets louder or not before doing anything.
__________________
David Merkel
Marketing Dir.
Billy Boat Exhaust
David Merkel
Marketing Dir.
Billy Boat Exhaust
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,581
Likes: 966
From: Communist Colorado
#7 plug was cracked.... stupid not taking them out!!! I replaced them all with a set of NGK TR55. Yea, on the clutch noise I was thinking that Ill just drive the car for a while and see if it goes away.
Premium Supporting Vendor
Joined: Aug 2004
Posts: 496
Likes: 14
From: Phoenix AZ
Glad you found the bad plug.As for the clutch noise I am sure our Bullet system will make it go away....well cover it up!!!
Burning Brakes
Joined: Aug 2009
Posts: 1,066
Likes: 6
From: Fayetteville Arkansas
I have a question, what kind of back fire are we talking about... I ask bc when Im above 2500 and let off the gas, i get a backfire... i just figured that was from no back pressure (I have headers, x pipe and GHL Bullets)
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Premium Supporting Vendor
Joined: Aug 2004
Posts: 496
Likes: 14
From: Phoenix AZ
What you are experiencing is not a back fire from a misfire like 81c3 but unburnt fuel in the exhaust igniting due to valve overlap, cam timing, etc. This is completely normal just more noticeable with the less restrictive exhaust.
Burning Brakes
Joined: Dec 2003
Posts: 1,243
Likes: 5
From: Loveland CO
Sounds like maybe a Defective thro out bearing if it goes away with the clutch pushed in.... or got damged during install.. helped a friend replace his clutch/flywheel/bearings after he had pulled the motor and reinstalled it, one of the bearings didnt go on straight and smashed it on. had to have the bearing cut off it was so jacked up. Made a squeel when the clutch was out but not in.
Hope for the best but i have not heard a TOB squeel new or otherwise unless it was bad.
S
Hope for the best but i have not heard a TOB squeel new or otherwise unless it was bad.
S
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,581
Likes: 966
From: Communist Colorado
Well, Ive done several clutch jobs in my lifetime (like 50 or more) and I can remember 1 maybe 2 having defective parts. I drove the car around town today breaking the clutch disc in as prescribed by Monsters paperwork included with the kit. When I first started the car I heard the noise for maybe 10 seconds. After that, no noise for the rest of the day. The car is running beautifully and its so much more pleasurable to drive now than with the Level 3 making the racket it was. Not sure what exactly was going on, but it seems to have disappeared. 
