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V8 Engine Discussion 6.2L LS3/L99 V8 | Exhaust | Ignition | Induction | Intakes

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Old 10-14-2009, 10:45 AM   #1
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Anyone get Check Engine Light after Installing Headers?

Just got my American Racing headers in the mail.

was curious to know if any of you guys got a check engine light for the rear O2 sensors and what you did to fix it besides getting a custom tune.

I gotta DiabloSport tuner and i'm having their tech support write me a custom tune to delete these trouble codes, one of the perks with buying their programmer.

i haven't installed them yet but anxious to see the results with my Magnaflow Comp Series Exhaust!!!

OHHH YEAAA NO MUFFLER! LOUD AND OBNOXIOUS!!!

Anyone get Check Engine Light after Installing Headers?-headers1-jpg Anyone get Check Engine Light after Installing Headers?-headers2-jpg Anyone get Check Engine Light after Installing Headers?-headers5-jpg Anyone get Check Engine Light after Installing Headers?-headers3-jpg Anyone get Check Engine Light after Installing Headers?-headers4-jpg
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Old 10-14-2009, 10:47 AM   #2
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Does the system only use 2 of the O2 sensors?
If so, the other 2 can be programmed out of the computer.

EDIT: Looking closely at the pictures, it looks like there are bungs for all 4 O2 sensors, so you shouldn't set any codes for that.
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Old 10-14-2009, 11:10 AM   #3
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yea but something with the front & rear O2's being a shorter distance apart and having to use an extension harness for the fronts throws off the calibration of the rears.

just what i've heard from people with different cars, but i won't know until its installed!
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Old 10-14-2009, 11:12 AM   #4
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Quote:
Originally Posted by RedJewel2SS View Post
yea but something with the front & rear O2's being a shorter distance apart and having to use an extension harness for the fronts throws off the calibration of the rears.

just what i've heard from people with different cars, but i won't know until its installed!
I've heard the same thing...since you're having the tune done anyway, might as well just take care of it.
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Old 10-14-2009, 11:30 AM   #5
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Aha, forgot about that.
Yeah, the only real solution is a tune.
If you're getting that done anyway, that'll take care of it.
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Old 10-14-2009, 11:30 AM   #6
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you will get a code eventually, for either of the cats efficiency, or for the front o2's insufficient switching time
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Old 10-15-2009, 08:50 AM   #7
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thanks
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Old 10-15-2009, 01:22 PM   #8
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actually the reason the check engine code comes on is because the o2 sensor is noticing that the air is moving through the exhaust at the same speed. the cat is normally there to slow down the movement. since the cat is gone, it moves through ratherquickly and throws the code. i was told the dealership can fix it, but you might as well take it and get a custom tune. for only 200-400 dollars, you can fix the check engine light, and get all of your parts workign together with freeing up some horse power. i need to make an appointment to get mine done. my light is on.
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Old 10-15-2009, 02:32 PM   #9
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actually the reason the check engine code comes on is because the o2 sensor is noticing that the air is moving through the exhaust at the same speed. the cat is normally there to slow down the movement. since the cat is gone, it moves through ratherquickly and throws the code. i was told the dealership can fix it, but you might as well take it and get a custom tune. for only 200-400 dollars, you can fix the check engine light, and get all of your parts workign together with freeing up some horse power. i need to make an appointment to get mine done. my light is on.
true if you were running no cats. however i ordered the kit with high flow cats. do you think the light would still come on with higher flowing ones?

i also have a diablosport programmer, and their tech support will delete the rear O2 codes from the tune for free. FYI
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Old 10-15-2009, 06:54 PM   #10
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Originally Posted by RedJewel2SS View Post
Just got my American Racing headers in the mail.

was curious to know if any of you guys got a check engine light for the rear O2 sensors and what you did to fix it besides getting a custom tune.

I gotta DiabloSport tuner and i'm having their tech support write me a custom tune to delete these trouble codes, one of the perks with buying their programmer.

i haven't installed them yet but anxious to see the results with my Magnaflow Comp Series Exhaust!!!

OHHH YEAAA NO MUFFLER! LOUD AND OBNOXIOUS!!!

Attachment 4049 Attachment 4050 Attachment 4053 Attachment 4051 Attachment 4052
Generally, the cats are the problem. Codes pop from cat insufficiency issues. The cats run somewhat cooler, which causes these codes. You can easily program the codes out, but this may affect your GM warranty. You can delete the codes with MSDs Dashawk or similar code reader, but they will come back.

At one time the header companies offered SIMs that mimicked the voltage the ECM was looking for to effectively fool the test. You might check with the header company.

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