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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 03-26-2014, 11:20 AM   #1
TXLS3
 
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No cel after long tube headers?

I installed stainless power 1 7/8" headers this weekend I have driven roughly 250 miles since.. My check engine light has yet to come on and I fully expected it too from my research on this forum. Has anyone not thrown a code after header install?
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Old 03-26-2014, 11:26 AM   #2
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did you replace the stock cats with high flow or off road pipes?
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Old 03-26-2014, 11:31 AM   #3
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It will come. I've seen some cars take months, but it will eventually happen; usually on longer/freeway drives.

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Old 03-26-2014, 11:33 AM   #4
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Mine stayed at bay until cold mornings, usually when i'm idling at a stop light it would come on. Long as it was somewhat warm though it usually wouldn't come on.

I think it eventually will happen though like the others said.
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Old 03-26-2014, 11:36 AM   #5
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Will driving the car with longtubes and no tune hurt the car at all?
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Old 03-26-2014, 11:43 AM   #6
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I drove mine for a month or so, everything I read says no, if anything it might be a bit rich.

The AFR on the base dyno pull looked OK also so I don't think you need to worry.

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Old 03-26-2014, 11:45 AM   #7
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Will driving the car with longtubes and no tune hurt the car at all?
No, you are fine.
Just that the flow is different so the CEL comes on
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Old 03-26-2014, 11:48 AM   #8
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Off road mid pipes
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Old 03-26-2014, 12:17 PM   #9
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The general consensus is that LTs will throw a code sooner or later, however, 9 months and 10,000 miles later, I'm still waiting for my CEL to come on.
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Old 03-26-2014, 12:26 PM   #10
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The general consensus is that LTs will throw a code sooner or later, however, 9 months and 10,000 miles later, I'm still waiting for my CEL to come on.
Nice, I plan on tuning but a tune cost almost as much as my next mod. and id have to get it retuned. No need for tuning until I'm done with my build, It will be at least 3-4 months before I can do the cam but I thought I would be looking at a cel until then.
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Old 03-26-2014, 02:07 PM   #11
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Nice, I plan on tuning but a tune cost almost as much as my next mod. and id have to get it retuned. No need for tuning until I'm done with my build, It will be at least 3-4 months before I can do the cam but I thought I would be looking at a cel until then.
I'm also doing a build and have put off getting a tune until the build is finished.
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Old 03-26-2014, 02:20 PM   #12
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Must complete at least 1 Gm drive cycle!
Maybe 3-5 of them to make all sensors ready (cel light come on)

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Reprinted on OBDII web site courtesy of General Motors Corporation
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Old 03-26-2014, 09:23 PM   #13
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Took mine 3 months of daily driving to come on, ran it like that till I did my cam for a year.
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Old 03-26-2014, 11:38 PM   #14
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Took mine 3 months of daily driving to come on, ran it like that till I did my cam for a year.
Nice.. Mine is not my daily driver so hopefully that buys me even more time. The 250 miles I put on her is only because the headers, I couldn't get out! Im in the same process my friend.. I just did headers and All I can think about now is a cam package and tune
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Old 03-27-2014, 01:11 AM   #15
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Came on at around 350 miles. Not a dd.
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Old 03-27-2014, 09:48 PM   #16
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Nice.. Mine is not my daily driver so hopefully that buys me even more time. The 250 miles I put on her is only because the headers, I couldn't get out! Im in the same process my friend.. I just did headers and All I can think about now is a cam package and tune
I know a guy... just sayin..
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Old 03-27-2014, 10:57 PM   #17
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I know a guy... just sayin..
i will definitely keep that in mind when it comes time
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Old 03-28-2014, 11:38 AM   #18
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I think mine took a week or two before I threw a cel. Nothing to worry about and you can drive all you want until you get your tune. You're not gonna hurt anything. I wouldn't pay for a tune twice just to get rid of the cel since your planning more mods and then a tune.


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Old 04-08-2014, 10:28 PM   #19
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I just did my LT/cat delete install and the light came on within the first few minutes and its running terribly. Almost like its missfiring. Checked all plugs and wires. o2 sensors appear to be in good working order. Everything is tight and in place so far as I can see. I swapped a few plug wires around to see if one might have been damaged during the install but no change. Any suggestions?
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Old 04-09-2014, 10:09 AM   #20
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Originally Posted by Stephen.Zazilenski View Post
I just did my LT/cat delete install and the light came on within the first few minutes and its running terribly. Almost like its missfiring. Checked all plugs and wires. o2 sensors appear to be in good working order. Everything is tight and in place so far as I can see. I swapped a few plug wires around to see if one might have been damaged during the install but no change. Any suggestions?
Did you take your plugs out for the install? If not, i'd bet you cracked one. Have you checked to see which CEL you're throwing?
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Old 04-09-2014, 10:22 AM   #21
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Didnt have a programmer to run the code. Turns out I cracked a plug.... stupid me. Shoulda checked that before I posted. Thankyou guys
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Old 04-09-2014, 07:17 PM   #22
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Took months for mine to come on.

Tune that beast as soon as you can, not that it's hurting your car, but it will run so much better once your tune is optimized to take advantage of the headers and other mods you may have.
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Old 04-09-2014, 07:58 PM   #23
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It took quite a while for mine to come on. Thought Id gotten away with it lol.
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Old 04-09-2014, 08:54 PM   #24
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Should be getting tuned next week. Ill post pics and videos
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Old 04-15-2014, 09:25 AM   #25
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Finally got it tuned after the header install. made 407.59hp and 407.03tq. Cant be mad at that considering my only mod is the exhausg system. still trying to get the videos to upload....
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