Codes with Coated Long Tube Headers???
Thread Starter
Team Owner
Joined: Aug 2003
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Codes with Coated Long Tube Headers???
For those of you who have either KOOKS or LGM headers and have them coated by either Jet Hot or anyone else, have you had any codes?
I am looking to buy a set of headers, they will be either LGMs or KOOKS and I will be running the cats.
I may not be getting the car tuned right away because there is no one here who I trust to do it locally. And I am on the fence about mail order tunes. I may have to travel to have it tuned.
That being the case, I don't want any codes. I should be able to get by without any lean or rich codes, but its the catalytic converter codes that I worry about and is one of the reasons why I intend to have the headers coated.
I do not want my rear 02s shut off either because I want the car to pass the OBD part of the emissions testing.
Those of you who are running coated long tube KOOKS or LGM headers and no tune, have you had any codes?
Thanks
I am looking to buy a set of headers, they will be either LGMs or KOOKS and I will be running the cats.
I may not be getting the car tuned right away because there is no one here who I trust to do it locally. And I am on the fence about mail order tunes. I may have to travel to have it tuned.
That being the case, I don't want any codes. I should be able to get by without any lean or rich codes, but its the catalytic converter codes that I worry about and is one of the reasons why I intend to have the headers coated.
I do not want my rear 02s shut off either because I want the car to pass the OBD part of the emissions testing.
Those of you who are running coated long tube KOOKS or LGM headers and no tune, have you had any codes?
Thanks
Last edited by '06 Quicksilver Z06; Jan 17, 2007 at 11:46 AM.
Race Director
Joined: Mar 2005
Posts: 11,549
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From: Southampton NJ
i have the kooks lt un coated get the 430 code about every 3000 miles. i turn it of with the code reader. carry it in the car. but it also tells if it is obd compliant, green, yellow, red light. green and yellow it is, and red it isnt. its always green or yellow.
Thread Starter
Team Owner
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It is theorized that part of the reason why folks who have coated headers don't get this code is because the coating tends to hold the heat inside the pipes and allows the cats to light up better than they would if the heat were dissipating.
You must be doing something right to not get any codes with uncoated headers on a C6. Where are your cats mounted, for or aft the X in the X pipe?
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Any idea as to why you have not had any codes? Its the catalytic converter code for the cats not getting hot enough which is usually set isn't it?
It is theorized that part of the reason why folks who have coated headers don't get this code is because the coating tends to hold the heat inside the pipes and allows the cats to light up better than they would if the heat were dissipating.
You must be doing something right to not get any codes with uncoated headers on a C6. Where are your cats mounted, for or aft the X in the X pipe?
It is theorized that part of the reason why folks who have coated headers don't get this code is because the coating tends to hold the heat inside the pipes and allows the cats to light up better than they would if the heat were dissipating.
You must be doing something right to not get any codes with uncoated headers on a C6. Where are your cats mounted, for or aft the X in the X pipe?
The key to not getting codes is to make sure you do not have any leaks anywhere in the system. Use new gaskets and make sure the slip joints are tight. That's probably the only things you can control. Otherwise, it's just pure luck. I'm probably on the verge of setting a code and it just stays below the threshold.
One last possibility. Maybe the Matrix Cats that LG uses are very efficient and do not need as much heat to light off?
Melting Slicks
Joined: Jul 2006
Posts: 2,090
Likes: 51
From: Georgetown TX
I chose Melrose because they came jet hot coated from the factory. Everything was great for the first 3 wks. Then, the CEL light came on. Code 0420. Factory is sending a new wiring harness but I'm not optimistic about this curing the problem. I am told that a tune is the cure.
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Le Mans Master
Joined: Sep 2004
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From: Shiloh Ohio
One time I have gotten a code, that was on my way home from my trip this fall.
I disconnected the battery and reset it. Has not come back yet, knock on wood.
I have LG high flow cats xpipe to corsa sports. They are uncoated. I think if I had to do it again I would coat them or buy coated headers. But it really is not too big of a deal, especially if you have the code reader tool and can reset it. I think coating adds about 300 bucks on average so it would be worth it if you did not get a cat code.
Also the idea about wrapping them in heat tape may be something we should try. I don't really see why that would help but it does not cost much to try it. I don't see how it could hurt anything.
I disconnected the battery and reset it. Has not come back yet, knock on wood.
I have LG high flow cats xpipe to corsa sports. They are uncoated. I think if I had to do it again I would coat them or buy coated headers. But it really is not too big of a deal, especially if you have the code reader tool and can reset it. I think coating adds about 300 bucks on average so it would be worth it if you did not get a cat code.
Also the idea about wrapping them in heat tape may be something we should try. I don't really see why that would help but it does not cost much to try it. I don't see how it could hurt anything.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
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From: Allentown PA
I doubt you will get a code/light with cats on anyway.
Thread Starter
Team Owner
Joined: Aug 2003
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I thought that it showed a "not ready" message if the rear 02s were off. I could be wrong however.
Safety Car
Joined: Dec 2004
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From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
does that mean they will pass the vehicle if the emissions systems tests hasn't completed ?
there are several obdII emissions tests that the car performs before it will trigger a mil, save for a circuit fault.
cool, that means anyone can pass the emisions test simply by investing $69 bucks in a scanner/reader and clearing any codes just prior to the emissions inspection.
there are several obdII emissions tests that the car performs before it will trigger a mil, save for a circuit fault.
cool, that means anyone can pass the emisions test simply by investing $69 bucks in a scanner/reader and clearing any codes just prior to the emissions inspection.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
does that mean they will pass the vehicle if the emissions systems tests hasn't completed ?
there are several obdII emissions tests that the car performs before it will trigger a mil, save for a circuit fault.
cool, that means anyone can pass the emisions test simply by investing $69 bucks in a scanner/reader and clearing any codes just prior to the emissions inspection.
there are several obdII emissions tests that the car performs before it will trigger a mil, save for a circuit fault.
cool, that means anyone can pass the emisions test simply by investing $69 bucks in a scanner/reader and clearing any codes just prior to the emissions inspection.
Thread Starter
Team Owner
Joined: Aug 2003
Posts: 38,314
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If the rear 02s have been shut off, then that part of the emissions system would give a "not ready" read out when the initial portion of the emissions testing was done.
Of course, I admit that I could be wrong about this. Just recall reading it in the C5 section several months ago.
http://forums.corvetteforum.com/show...post1555821944
http://forums.corvetteforum.com/show...post1555308666
http://forums.corvetteforum.com/show...post1556501649
http://forums.corvetteforum.com/show...post1557795461
http://forums.corvetteforum.com/show...post1556101904
If the rear 02s are disabled, how is it going to read that the emissions system is "ready" to test?
Finally, you can "pass" in so me states but if you look at the printout, they give you until the next year to correct "some" non serious problems. You'll get the sticker though. This may have been what happened in your case. But if you had no functioning rear 02s, and the information from the OBD would have indicated that, then I don't see how the emissions system could have been checked.
.
Last edited by '06 Quicksilver Z06; Jan 18, 2007 at 07:56 PM.