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Old 10-26-2009, 09:22 PM   #1
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Those with LT's, RESET your check engine light!

I have the Stainless works long tubes, high flow cats, 3" pipes, and currently have the 2 1/2" mufflers installed on my LS3.

I got my check engine light once I got back from Carlisle, PA after an 1,800 mile trip and after having the car for 6 days. The check engine light was nothing, really....just a small dim light that stayed lit on my dash...which I though would be there forever.:(

I figured nothing could be done.

Well, I ended up getting into a conversation with a retired GM employee and after a few drinks, the whole topic of the fuse pull, batter disconnect, etc came up and I mentioned that I had the SES light (check engine light). I was told that the cars computer eventually learns the new pipes and would probably adapt to the new long tubes and freer flowing air.

We reset my light and the O2 code disappeared. I was told to keep an eye on it and if it didn't come back on after 50 starts, I should be fine. Well, that was about 3 weeks ago and I've had well over 50 starts. Guess what? NO MORE CHECK ENGINE LIGHT!!!

So, for all of you worried about LT's and SES lights.....

(this is my experience....I don't know if all results would be the same..... But you NEVER know)
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Old 10-26-2009, 09:34 PM   #2
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the ecm probly has not done the catalyst monitoring test yet, its not how many starts you do, it is the obd2 driving cycle, you probly have not met the ecm requirements for the catalyst test to complete
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Old 10-26-2009, 09:36 PM   #3
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IMO and from experience its more than likely gunna come back on. if not, more power to ya

but dont worry too much, very simple to "tune out" the catylist efficency codes if it does come back
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Old 10-27-2009, 12:27 AM   #4
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Quote:
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the ecm probly has not done the catalyst monitoring test yet, its not how many starts you do, it is the obd2 driving cycle, you probly have not met the ecm requirements for the catalyst test to complete
Well, as nicely as I can put it, I hope you are wrong...

The guy I spoke with seemed to know what he was talking about (not that I'm saying you don't). It sounded odd...50 starts and all...but, he was chalk full of info and like I said, I'm WELL over 50 starts and it's been several weeks. My light came on right away (5 days) from owning it. Then again, Stainless had it for a while too. So, more than that. And, you have to add in teh starting and driving while at Toms. So, I held off before I said anything. Worst case scenario, I live with it or reset it once per month.
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Originally Posted by kelleyperformance View Post
IMO and from experience its more than likely gunna come back on. if not, more power to ya

but dont worry too much, very simple to "tune out" the catylist efficency codes if it does come back
When I get the tune, it'll happen. Until then, the warranty is worth a LOT more than a simple light.
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Old 10-27-2009, 09:10 AM   #5
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How did you reset it? I pulled my battery cable before but will get a light from just getting on the interstate. I can drive around town all day, everyday but if I just give it some throttle, it will come back.
Of course I have the V6.
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Old 10-27-2009, 09:15 AM   #6
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Quote:
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How did you reset it? I pulled my battery cable before but will get a light from just getting on the interstate. I can drive around town all day, everyday but if I just give it some throttle, it will come back.
Of course I have the V6.
You have to reset it with a code reader, disconnecting the battery won't do it. You will have to go to the dealer or somewhere that will read codes like Auto Zone.
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Old 10-27-2009, 11:03 AM   #7
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Old 10-27-2009, 11:16 AM   #8
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Quote:
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You have to reset it with a code reader, disconnecting the battery won't do it. You will have to go to the dealer or somewhere that will read codes like Auto Zone.
it doesnt matter how you clear the code... its going to come back if its not disabled with tuning software

Quote:
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Is there any downside in disabling the efficency codes?
it has no effect on the car other than not allowing the CEL on the dash to illuminate for the codes you select. you can also select for them to not even appear if the car is scanned with any type of scan tool
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Old 10-27-2009, 11:55 AM   #9
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no problem
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Old 10-27-2009, 12:56 PM   #10
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I was going to PM you Tag on this very issue cause I new you had LT's
without a tune...Thanks.
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Old 10-27-2009, 01:05 PM   #11
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Reset mine at the dealer..It came back...:(
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Old 10-27-2009, 01:14 PM   #12
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I have HP Tuners Pro to fix these SEL issues.
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Old 10-27-2009, 01:24 PM   #13
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I have the Stainless works LT 2" primary s and 3" Hi flo cats and 3" exhaust with the S style mufflers. No CAI . and I have had no problems at all over 3000 miles on my car now.
I whip it all the time too. My pipes are running a little black though.
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Old 10-27-2009, 01:31 PM   #14
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Quote:
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I have the Stainless works LT 2" primary s and 3" Hi flo cats and 3" exhaust with the S style mufflers. No CAI . and I have had no problems at all over 3000 miles on my car now.
I whip it all the time too. My pipes are running a little black though.
give it time, the right conditions one day and you got a CEL
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Old 10-27-2009, 03:24 PM   #15
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What more time does it need . over 3000 miles with the system on and no light.
Maybe it's because i haven't did a CAI yet.
Oh well i'm not complaining.
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Old 10-27-2009, 06:13 PM   #16
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Does anyone make/sell O2 simulators
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Old 10-27-2009, 06:34 PM   #17
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I believe Casper electronics should have them.
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Old 10-27-2009, 09:23 PM   #18
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Quote:
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I believe Casper electronics should have them.
the feds busted them a while ago and they had to refund lots of $$ and pay some big fines for selling items designed for tampering with emissions equipment:



http://teamzr1.com/ubbthreads/ubbthr...at&Number=1852




.
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Old 10-28-2009, 12:25 PM   #19
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Quote:
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Reset mine at the dealer..It came back...:(
How long did it take to come back? What kind of system do you have?
Quote:
Originally Posted by Becustom View Post
What more time does it need . over 3000 miles with the system on and no light.
Maybe it's because i haven't did a CAI yet.
Oh well i'm not complaining.
I figure mine might come back after the CAI.

However, according to the folks I was talking to, this is a new system....and the light should stay off. I will let you know if it comes back on, but he seemed pretty sure that it was going to stay off now.

I'm not going to say 100% for sure it'll stay off....just saying that so far, it's not coming back on. And, if there's anyone who knows for fact how the car does it's checks, let me know. Is it by starts, by miles, what?

Who knows?....for FACT?


Again, I was told for FACT that it was 50 starts. I'm waaaaay past that. I say fact since I was dealing with a person who's bud programmed the Camaro (helped)....and the people around us in his presence who work for GM sure as hell didn't call him a liar when he was giving us this info. Again, if it comes back on, it comes back on....I won't fret. However, I gave it some time and here we are today......no light.
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Old 10-28-2009, 06:42 PM   #20
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I can almost guarantee you it will come back on eventually, It took Andy from ADM 3 tunes and 2 months to finally turn mine off permanently.

I tried disconnecting the battery too and it would eventually come back on.
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Old 10-28-2009, 07:51 PM   #21
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yeah im a GM certified tech, as well as a tuner who has his own dyno im not trying to knock anyones spirit about not having a CEL, just trying to keep you perpared for that pesky bastard to light back up eventually. they always do :(

and yea, simulators are illegal and most places who made them have stopped due to fines and such. the only ones i know of are physical spacers that basically thread into the O2 housing, and then the O2 threads into them. it just pulls the sensor out of the pipe a little bit to trick the sensor into seeing less flow... but usually different setups require different sizes so IDK how well that will work
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Old 10-29-2009, 01:49 AM   #22
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Hey, no problem at all...and I won't get all butt hurt when it does come back on.

I held off on saying anything...since with everything I know, it SHOULD have come back on by now. But, I'm waiting....patiently....(and would like to CONTINUE waiting for a long, long time) for that light to come back on.

If and when it does come back on, I'm more than happy to post it up for all to know.

And should it, I'll reset it...and wait once again! Really, that light is so small, it doesn't bother me at all. I put 3,000 miles on my car with that light on. Just a tiny orange light...lol
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Old 10-29-2009, 02:04 AM   #23
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and i hope that it doesnt come back on. i could care less about being right or wrong lol.

only real problem with a long term CEL is you have no idea if another code, potentially requiring attention, has come up.
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Old 10-29-2009, 02:37 AM   #24
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Yep. That's EXACTLY what I'm worried about and why I don't want to disable that light. I'd rather have the code read and go from there.

For example, I dismantled my air intake with teh car ON....MISTAKE!....threw 4 more codes on top of the LT's. We fixed them all. But, I thought it was only the LT code. That could result in even more issues if not fixed!
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Old 10-29-2009, 07:25 AM   #25
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yea i dont mean disable the entire CEL. not at all.... you can individually "turn off" codes. basically they still report (the ones you chose) the issue,but dont illimunate the CEL. or the codes you select to disable, you can make the PCM not report them at all (ie to pass some inspections if they dont smog). every other code except the ones you disable function as normal, and the CEL still illuminates when needed
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