Start here, then check your plugs if they look good then check your timing in the car. OP here sounds like the tune on the car is running more than a little RICH. But most tuners will do that with a tune on about any car...Robert
Backfire??
Thread Starter
Pro
Joined: Feb 2013
Posts: 565
Likes: 143
From: Bedford VA
Backfire??
My car is an MN6 '01 convertible with 51k miles, LTs, Cat Back, and CAI. It has an older tune on it from when the PO installed the headers. Recently it has started popping once per 1-2, 2-3 and 3-4 gear shift like a backfire when cold. Once it warms up, it may pop/gurgle a little but not the backfire sound. Any ideas where to start to look for the issue? By the way, the exhaust tips run black all the time. I can clean them and within a few miles, black again.
Team Owner
Joined: Jan 2007
Posts: 29,065
Likes: 1,839
From: cookeville tennessee
Melting Slicks
Joined: Jul 2012
Posts: 2,507
Likes: 9
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
My GMC truck was running rich and sputtering. Cleaned the air flow sensor and it cured it. Just figured it might be his problem.
Last edited by JR-01; Jul 10, 2014 at 11:07 AM.
Le Mans Master
Joined: Aug 2009
Posts: 5,197
Likes: 190
From: ALL governments are legalized mobsters, so doesn't matter where I live :(
It's funny, I have the EXACT same issue ever since installing my LT headers and hi-flow cats. Now my tail pipes are dirty all the time. Many air filter was clean as was the MAF so not sure what else is going on. The only other thing I can suspect is the O2 sensors.
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
Thread Starter
Pro
Joined: Feb 2013
Posts: 565
Likes: 143
From: Bedford VA
Thanks for the suggestions. I cleaned the MAF and TB when I got the car last June. Has had the black tip problem since owning it. The backfire when cold is something new. I'm leaning toward a rich tune since my MPG is not quite what I would expect based on my old '98.