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Old 09-26-2011, 11:52 PM   #1
96/10SS
 
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Is there harm in running with a CEL?

I really want to get headers but I am trying to avoid getting a tune. I don't want to blow my warranty. I know if I have a problem is has to be linked to the exhaust for it to be voided, I know if they see headers on my car they might void it anyways but I have a buddy with a shop and worst comes to worst I figure I can have him take out the headers, then bring the car in for warranty. So my question is what can go wrong running headers on the car with no tune? Thanks
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Old 09-27-2011, 12:06 AM   #2
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Been running mine since early August without a tune and a CEL on and no problems. Put it on the dyno and made 403 HP/402 TQ. Planning on getting a tune in the near future, but so far, its ok.
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Old 09-27-2011, 12:27 AM   #3
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Been running mine since early August without a tune and a CEL on and no problems. Put it on the dyno and made 403 HP/402 TQ. Planning on getting a tune in the near future, but so far, its ok.
What headers are you running? and I don't really plan to get a tune for a while considering I only have 11k miles and 3-4 years left on my powertrain..
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Old 09-27-2011, 01:05 AM   #4
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I ran mine for a year with the CEl with no issue. Running LT headers normally requires replacing the factory cats with high flow ones, and moving them further back. On each exhaust bank, you car ha stwo O2 sensors. One pre cat, and one post cat. The computer compares the readings from the sensor before the cat, with the readings from the ones after the cat and decides if your car is running right. Since you moved the cats, and changed how they flow, it is of course outside the readings your car expects. Basically, your car is saying "Hey the rear O2 sensor readings say the cats are failing"..but you know that is kind of a false positive.

Some people get the light immediatly, others it takes a while. The time where it is most likely to come on is after you start the car because the high flow cats do not light off and get to temp as fast. There is no brand that is better than the other at preventing a CEL.
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Old 09-27-2011, 01:31 AM   #5
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I ran mine for a year with the CEl with no issue. Running LT headers normally requires replacing the factory cats with high flow ones, and moving them further back. On each exhaust bank, you car ha stwo O2 sensors. One pre cat, and one post cat. The computer compares the readings from the sensor before the cat, with the readings from the ones after the cat and decides if your car is running right. Since you moved the cats, and changed how they flow, it is of course outside the readings your car expects. Basically, your car is saying "Hey the rear O2 sensor readings say the cats are failing"..but you know that is kind of a false positive.

Some people get the light immediatly, others it takes a while. The time where it is most likely to come on is after you start the car because the high flow cats do not light off and get to temp as fast. There is no brand that is better than the other at preventing a CEL.
Alright cool so pretty much the CEL is just telling me to check the car, but its not going to harm any parts correct? I read on some threads that headers with no tune will make the car run lean and put stress on the motor.
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Old 09-27-2011, 02:05 AM   #6
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I'm running the XS Power headers and Catback. 153xx miles on my car now, installed the headers at around 134xx miles, so almost I've put almost 2000 miles on the system.
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Old 09-27-2011, 03:18 AM   #7
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Alright cool so pretty much the CEL is just telling me to check the car, but its not going to harm any parts correct? I read on some threads that headers with no tune will make the car run lean and put stress on the motor.
I have had the opposite where it runs a little rich. Either way..nothing that will damage the engine. I would say check the codes every once in a while though as ones not related to the cats may reflect another issue.
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Old 09-27-2011, 07:36 AM   #8
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Will it pass inspection with CEL?
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Old 09-27-2011, 08:32 AM   #9
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Will it pass inspection with CEL?
Not sure how they do TX inspections but I would assume no. Don't forget a CEL can be easily deleted. All you need to do is take it to your common auto parts store and delete it. Or buy a cheap obd2 scanner and you can delete it yourself. You can find them for $20-25 and keep it in your glove box if you like.
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Old 09-27-2011, 08:36 AM   #10
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Alright cool so pretty much the CEL is just telling me to check the car, but its not going to harm any parts correct? I read on some threads that headers with no tune will make the car run lean and put stress on the motor.

You will run rich with headers on a fuel injected car. Long tubes move the OBD2 sensor further down the exhaust then the stock setting. This causes the engine to run rich. Running rich won't blow your motor, it'll burn through some extra gas and you'll go through spark plugs quicker. I wouldn't recommend driving like that for too long but it can be done. You'll be leaving a lot of power on the table.
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Old 09-27-2011, 08:42 AM   #11
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People who do this are just plain silly.

I call them cake and eat it too-ers. They want to mod the car to their liking bc they aren't happy with how GM built it BUT still expect GM to cover it. If you're going to mod, face the facts that your warranty MAY be voided. Don't half ass it. If you're that stuck on your warranty, don't turn a bolt on you're car. Problem solved.
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Old 09-27-2011, 08:58 AM   #12
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and if you break a valvespring, blow a gasket, a sensor dies, etc. ... you wont know because you have learned to live with the lighted CEL.
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Old 09-27-2011, 09:29 AM   #13
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You will run rich with headers on a fuel injected car. Long tubes move the OBD2 sensor further down the exhaust then the stock setting. This causes the engine to run rich. Running rich won't blow your motor, it'll burn through some extra gas and you'll go through spark plugs quicker. I wouldn't recommend driving like that for too long but it can be done. You'll be leaving a lot of power on the table.
Yea I just am really hesitant about it, i might just wait until i find a mod friendly dealer or not worry about the warranty. Im not worried about leaving power on the table this car is plenty powerful enough as is i just think the tone these cars get with headers is amazing plus a little extra hp never hurt any one.
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Old 09-27-2011, 09:31 AM   #14
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and if you break a valvespring, blow a gasket, a sensor dies, etc. ... you wont know because you have learned to live with the lighted CEL.
Yea i see what you're saying, this would not be good.
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