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Old 04-27-2017, 10:20 AM   #1
moremusclelessrice
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Issue Passing Emissions With Deleted Cats

I'm running Kooks longtube headers with off-road mid pipes. I have installed the sensor extension harnesses along with Maverick Man Carbon 02 sensors 90-degree adapters. Both the up and downstream sensors are installed. When I take the car in for emissions it will not pass due to an incomplete readiness monitor for the catalyst. Initially I thought because the car sits over the winter that it needed to be driven in order for all monitors to be checked. However, after driving over 30 miles spanned across several days the same result occurred. The CEL is not on and there are no active codes. Anyone have any suggestions?
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Old 04-27-2017, 10:31 AM   #2
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Were the rear sensors turned off in the tune? Maybe that's whats causing it?
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Old 04-27-2017, 11:12 AM   #3
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Probably in the tune or you didn't complete the driving cycle.
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Old 04-27-2017, 11:15 AM   #4
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You should be allowed at least one system to not be ready. Idk how your state operates.
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Old 04-27-2017, 11:22 AM   #5
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Quote:
Originally Posted by Steel Chicken...View Post
Probably in the tune or you didn't complete the driving cycle.

this
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Old 04-27-2017, 03:27 PM   #6
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keep driving.... my car is still untuned and takes about 45 miles before the monitors are ready and the check engine light comes on

also make sure the tune was done properly

if you have a scan tool or a cheap bluetooth obd2 plug and the torque app for android can watch the monitors to see if they are ready before you go waste time at the shop.
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Old 04-27-2017, 03:51 PM   #7
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http://www.ls1gto.com/forums/showthread.php?t=347161

dug that up for you.

ski was having a similar issue. he tried following the driving cycle as closely as possible at it at least cleared the cat eff. stuff.

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Quote:
Originally Posted by 207...View Post
Generally the drive cycle has specific tests that have to be performed for a specific time period and speeds.

Here's a GM one from OBDII/AutoTap that may work.
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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:

1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50C (122F) and within 6C (11F) 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

7. 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.

8. 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
General Motors Corporation


If you think this one is tough you should have seen the one I had to do on my F150 Ford... following the instructions for that, it took me two days to complete!! The truck had to sit for 8+ hours and then repeat the cycle!.. but, it worked.

Good luck.

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Old 04-27-2017, 04:00 PM   #8
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the other thing is that, i think the ECM will periodically re-complete these tests. it isn't one and done until the ecm/codes are cleared again.

also, i know the car should do the "post o2" test at least once during a trip. I have it turned off on my 05 because it's annoying as smurf. (y'all with widebands know what i'm talking about). i don't think this is the only test to monitor cat efficiency, but it just goes to show the ECM is constantly checking stuff.

there's a "catalyst test" box in the engine diag exhaust tab as well. might be something to check...
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Old 04-27-2017, 06:00 PM   #9
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Quote:
Originally Posted by Nothubertjfarnsworth...View Post
http://www.ls1gto.com/forums/showthread.php?t=347161

dug that up for you.

ski was having a similar issue. he tried following the driving cycle as closely as possible at it at least cleared the cat eff. stuff.

There was something goofy going on with that old 04 I had. We had to put the stock tune back in the car before those monitors would set. I then had the modified tune thrown back in after I passed inspection. Didn't have an issue after that as from that point on I was exempt from emissions testing due to getting a company car a month later.
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Old 04-27-2017, 06:09 PM   #10
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Quote:
Originally Posted by SkiPopeye36...View Post
There was something goofy going on with that old 04 I had. We had to put the stock tune back in the car before those monitors would set. I then had the modified tune thrown back in after I passed inspection. Didn't have an issue after that as from that point on I was exempt from emissions testing due to getting a company car a month later.

do you think it was your tune?
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Old 04-27-2017, 06:14 PM   #11
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Yes. It had to have been. No other excuse as the car was driven 10k miles from the time it was tuned till I had the car inspected.

The monitors magically all set 50 or so miles after we flashed the stock tune back into the car. There's no other explanation.
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Old 04-28-2017, 03:20 AM   #12
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Hmm. I wonder what it was in the tune that did it.

Last edited by Nothubertjfarnsworth; 04-28-2017 at 02:38 PM.
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Old 04-28-2017, 06:15 AM   #13
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No clue at all and never bothered to worry about it ever again as that was the last time I ever had to worry about emissions testing.
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Old 04-28-2017, 12:15 PM   #14
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Quote:
Originally Posted by Steel Chicken...View Post
Probably in the tune or you didn't complete the driving cycle.

Still have the stock tune for now. I have a pair of widebands to get a custom tune soon but not as of yet. Could that be the issue?
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Old 04-28-2017, 12:16 PM   #15
moremusclelessrice
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Quote:
Originally Posted by Nothubertjfarnsworth...View Post
http://www.ls1gto.com/forums/showthread.php?t=347161

dug that up for you.

ski was having a similar issue. he tried following the driving cycle as closely as possible at it at least cleared the cat eff. stuff.

Quote:
Quote:
Originally Posted by 207...View Post
Generally the drive cycle has specific tests that have to be performed for a specific time period and speeds.

Here's a GM one from OBDII/AutoTap that may work.
__________________________________________________ _

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:

1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50C (122F) and within 6C (11F) 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

7. 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.

8. 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
General Motors Corporation


If you think this one is tough you should have seen the one I had to do on my F150 Ford... following the instructions for that, it took me two days to complete!! The truck had to sit for 8+ hours and then repeat the cycle!.. but, it worked.

Good luck.

Thanks for the info. I'll run through all that and see if that fixes things.

Last edited by moremusclelessrice; 04-28-2017 at 03:00 PM.
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Old 04-28-2017, 10:21 PM   #16
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If you are running catless mids and kooks LT's with a stock tune you arent going to pass until you get a tune... bottom line

keep driving, your check engine light should come on.
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Old 04-29-2017, 03:44 AM   #17
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Oh wait, you still have the OEM tune in the car with catless LT's? That's your issue.
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Old 04-29-2017, 01:23 PM   #18
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well this thread has certainly been interesting.
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Old 04-30-2017, 04:27 AM   #19
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Quote:
Originally Posted by SkiPopeye36...View Post
Yes. It had to have been. No other excuse as the car was driven 10k miles from the time it was tuned till I had the car inspected.

The monitors magically all set 50 or so miles after we flashed the stock tune back into the car. There's no other explanation.

In at least some GM PCMs there are two different ways to 'disable' the codes. If you turn them off/disable the code the test readiness/completeness monitors will never set since it will be has if the tests have never run. If you set the codes to 'no report' the tests will still run and it will set the readiness/completeness monitors but if the test fails it will not set a code, active/pending or otherwise. I suppose it's entirely possible which ever tuning suite was used doesn't make this distinction, but it's an important one.
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Old 05-19-2017, 06:58 AM   #20
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I thought that if any emissions equipment is missing, cats, it won't pass visual inspection and they won't go any further whether or not the tune could make it pass the sniffer test. That's how I believe it is where I live.
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Old 05-19-2017, 07:06 AM   #21
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Different states have different laws, but yes that is the way it is here in NY.
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Old 05-19-2017, 01:20 PM   #22
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I'm gonna echo the "more driving" sentiment. 30 miles over several days implies multiple trips, which means that's a lot of short drives.

My monitors were ready after two 30 minute drives through a canyon (out to a friend's house and back). Lots of accelerating, slowing, differing speeds, etc.
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Old 05-19-2017, 01:22 PM   #23
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Quote:
Originally Posted by chevyz1...View Post
I thought that if any emissions equipment is missing, cats, it won't pass visual inspection and they won't go any further whether or not the tune could make it pass the sniffer test. That's how I believe it is where I live.

Different states, different laws. In CA, you're correct. It also depends on the shop though. Some will overlook mods.

Here in CA, many would overlook longtubes or high flow cats, etc as long as it passed the sniffer. Now with the new smog laws (no car newer than 2000 is put on a sniffer) they're a little more strict, since its visual/computer check only and the sniffer is irrelevant.
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