Those with LT's, RESET your check engine light!

[TAG UR IT]

I know I'll get a few "I told ya so's," but... at least I'm honest....

Light came back on during that COLD COLD weekend....on Sunday before my drive to Houston for the dyno. Oh well...no biggie for me anyway.

[camaro1]

ok, i wont even say it!

[JuicedSS]

Originally Posted by TAG UR IT

I know I'll get a few "I told ya so's," but... at least I'm honest....

Light came back on during that COLD COLD weekend....on Sunday before my drive to Houston for the dyno. Oh well...no biggie for me anyway.

Just do what I do- reset it and forget it.

[NAHURRY]

Thanks Tag for keeping us in the loop with the light/codes. Is it a running
too rich/lean code?

[2SSRS@Gen5diy]

Originally Posted by TK

I don't understand, a bit of noob to certain things "cars". but what does an exhaust have to do with a vehicle running lean/rich. Shouldn't the amount of fuel to air ratio be based on the intake (mass airflow sensor) and computer?

Someone explain to me because I'm thinking of LT's up to stock cats, already have a muffler delete. I rather it not affect my fuel economy, although I'm not too concerned, more concerned about the CEL.

If i may, The ECM on this car dos things that don't make any Common Sense,
As you know if you put on LT headers on a car that has a carburetor it gos lean, But on this car it go's rich, Why it dos this is something for the engineers to tell us.

But for you if you run the LT's up to stock cats you may not have any problems as its the moving of the 02 censers that give you the CEL.

[TAG UR IT]

Not too sure why it's tripping. My AFR is fine. On the last two dyno's it was 12.4 and then 12.1. So, we are fine running around.

Hrm...I don't know. I'll need to find someone with EFI Live, HP Tuners, etc and figure it out. Maybe on our next run up to Houston we'll figure it out. Runs fine...just gettin' that darn light again.

[JuicedSS]

Originally Posted by TAG UR IT

Not too sure why it's tripping. My AFR is fine. On the last two dyno's it was 12.4 and then 12.1. So, we are fine running around.

Hrm...I don't know. I'll need to find someone with EFI Live, HP Tuners, etc and figure it out. Maybe on our next run up to Houston we'll figure it out. Runs fine...just gettin' that darn light again.

When my light came on, I called On-Star to get an on demand diagnostic check. I just wanted to make sure it was the cats and not something else. On-Star confirmed that the codes were emissions related.

[Mzodarg]

I am getting a set of Kooks LTs and HF cats on Tuesday, Car will also be Dyno Tuned.

I hope I dont have the light issues like has been decribed here.

[camaro1]

depends on what code,, usually long tubes will set:

DTC P1133: HO2S Insufficient Switching Bank 1 Sensor 1

DTC P1153: HO2S Insufficient Switching Bank 2 Sensor 1

these codes are because the front o2 sensors are positioned farther down the line and have different exhaust flow past them compared to when they are up closer to the engine in the factory pipes

also codes for the cat efficiency can come on because the long tube bullet cats are not as efficient as the factory 4 cat system,, those codes are p0420 and p0430

[Mzodarg]

Guessing that the tuner can tune this out? Or is it hit and miss?

[camaro1]

Originally Posted by Mzodarg

Guessing that the tuner can tune this out? Or is it hit and miss?

yup, they can fix the issue

[Mzodarg]

Cool, from what I have been reading-I thought so. But then to read the issues that Tag is having, made me wonder.

[camaro1]

Originally Posted by Mzodarg

Cool, from what I have been reading-I thought so. But then to read the issues that Tag is having, made me wonder.

Tag's computer hasnt been tuned yet,

[Mzodarg]

Ok- Got it.

#51
TAG UR IT
Moderator



Drives: 2010 THR 2SS/RS

Join Date: Jul 2006
Location: SA, Texas
Posts: 13,436

View My Garage

Not too sure why it's tripping. My AFR is fine. On the last two dyno's it was 12.4 and then 12.1. So, we are fine running around.

With an AFR I assume he had been tuned.

Mike