Help
Thread Starter
Heel & Toe
Joined: Apr 2009
Posts: 24
Likes: 0
From: Oak Forest Illinois
Help
Hello, I recently got an 05 z51. I bought the car from a dealer, and the car has long tube headers, w/ a cai. The only problem is I dont know what kind they are. I tried to look on the sides of them but it doesnt say. Anyway, the car has a 12 month 12,000 mile extended warranty. My check engine light just came on. Well my friend is a mechanic and he scanned it for me and it says something like catalytic converter low efficency bank 2. Any idea why? or will the dealer cover that under warranty w/ the headers. I am afraid to take it in and it not be covered. But if it is something I can fix I will just do it myself.
Melting Slicks
Joined: Feb 2004
Posts: 3,131
Likes: 148
From: Sugar Land TX
Take it to Auto Zone or any parts store that can scan it for you and see what code comes up. Or do you have a friend with HP Tuner or LS1Edit?
Most likely it has been tuned and the dealer wil void the warranty.
Most likely it has been tuned and the dealer wil void the warranty.
Drifting
Joined: Sep 2000
Posts: 1,456
Likes: 5
From: Bothell WA
Try to take a picture of the headers from below the car. I think people on the forum will be able to identify them for you from some good pictures.
I'm not positive about your year of car, but in mine, the stock cats are along side the engine just below the stock manifolds. If your car was originally like this, then the headers have taken the place of the stock cats. So either the stock cats have been moved to under the car or you have aftermarket cats. I'm not sure if your extended warranty will cover that or not. You'd have to look at the fine print.
There are oxygen sensors in the exhaust pipe both before and after each of the 2 cats. Since you are getting a cat related error, that means the engine tuning hasn't eliminated the cat monitoring. So I'd check the oxygen sensors and the wiring to them. If the cats were relocated, its possible the wiring had to be extended and perhaps that's causing your problem. The other thing that can be done is to eliminate the cat monitoring.
Hope that gets you started.
- Mark
I'm not positive about your year of car, but in mine, the stock cats are along side the engine just below the stock manifolds. If your car was originally like this, then the headers have taken the place of the stock cats. So either the stock cats have been moved to under the car or you have aftermarket cats. I'm not sure if your extended warranty will cover that or not. You'd have to look at the fine print.
There are oxygen sensors in the exhaust pipe both before and after each of the 2 cats. Since you are getting a cat related error, that means the engine tuning hasn't eliminated the cat monitoring. So I'd check the oxygen sensors and the wiring to them. If the cats were relocated, its possible the wiring had to be extended and perhaps that's causing your problem. The other thing that can be done is to eliminate the cat monitoring.
Hope that gets you started.
- Mark
Team Owner
Joined: Oct 2004
Posts: 27,420
Likes: 64
From: San Clemente CA
This could be a touchy issue. Long tube headers require the cats be moved which is a federal emissions violation. The extended warranty that came with the C6 might pay for the problem if the selling dealer handles the warranty work. If it's a GMPP that could be an issue. Good luck and let us know what happens. 
Thread Starter
Heel & Toe
Joined: Apr 2009
Posts: 24
Likes: 0
From: Oak Forest Illinois
Mark thank you for that info. I will try to take a couple of photos of the headers. I didn't realize that the headers take the place of the cats. Like I said I bought it from a dealer so I dont know if it has been tuned. I guess I will call the local dealer and ask. I bought the car in New York and I live in chicago. I will have to see if they will at least tell me the problem. But like you said, it might not even have cats. If that is the case then I will just get a tune.
Thread Starter
Heel & Toe
Joined: Apr 2009
Posts: 24
Likes: 0
From: Oak Forest Illinois
Ok so I was able to snap some pics of the undercarriage. Here is the headers and H pipe. Can anyone tell me what kind of headers these are? And do I have cats, if so are they stock or are they apart of an aftermarket X pipe. I do know that the exhaust is stock. TOO QUIET FOR ME. Also what kind of cold air intake is this? Please help
Last edited by Paliga; Apr 26, 2009 at 09:17 PM.
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
Not American Racing, their pipe x's in front of the cats. Not LG's because the primaries would be showing in the second picture.
We really need a picture of the header collector to identify.
I'm guessing Kooks, then again maybe not,, I think Kooks has a name plate on their header...
Maybe TPIS..There are some pictures on their Ebay site.
We really need a picture of the header collector to identify.
I'm guessing Kooks, then again maybe not,, I think Kooks has a name plate on their header...
Maybe TPIS..There are some pictures on their Ebay site.
Last edited by nwc6; Apr 27, 2009 at 08:24 PM. Reason: ??
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
Thread Starter
Heel & Toe
Joined: Apr 2009
Posts: 24
Likes: 0
From: Oak Forest Illinois
Ok well that helps a little bit. I can't believe that there is no markings on the headers. If I were to put a corsa sport exhaust on would I need a cat back or just the mufflers?
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Not American Racing, their pipe x's in front of the cats. Not LG's because the primaries would be showing in the second picture.
We really need a picture of the header collector to identify.
I'm guessing Kooks, then again maybe not,, I think Kooks has a name plate on their header...
Maybe TPIS..There are some pictures on their Ebay site.
We really need a picture of the header collector to identify.
I'm guessing Kooks, then again maybe not,, I think Kooks has a name plate on their header...
Maybe TPIS..There are some pictures on their Ebay site.
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
Thread Starter
Heel & Toe
Joined: Apr 2009
Posts: 24
Likes: 0
From: Oak Forest Illinois
Ok good at least it will be a little cheaper for just the mufflers and the over axle pipes. So the X or H pipe on there now is not stock right? I was just wondering because if I buy the exhaust I want to make sure it will fit.