will i pass???
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
What state do you live in? In IL, you don't need cats to pass. Just custom tuning to get rid of the SES light and any other DTCs for removed emissions equpitment.
there are items you have for emissions that they see on there computer. EGR, air system, catylst, o2 sensers, heater circuits for 02 senser. you need to have at least three of the five items to pass emissions. If you have the emissions removed by custom tuning the emissions people will see this as a N\A on there compter and you will fail the test. This happened to me before. I don't have cats on my car but have the o2 sims on.
Joined: Nov 2001
Posts: 34,629
Likes: 2,549
From: Schiller Park, ILL Member: #317
Originally Posted by justinbmx
If you have the emissions removed by custom tuning the emissions people will see this as a N\A on there compter and you will fail the test.
Tune it properly, and there will be no issues. It's a matter of making the DTC test run (on), but turning the MIL off (making it a Type X [no MIL] DTC) for that DTC test.
PS. There are more than 5 OBD tests that they scan, and you have to have more than just 3 as "complete".
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I'm not going to mention the speed that tuned my car. But when I went to the emission lane I failed. Took car back to the speed shop and told them what happened. Speed shop reply. Well you wouldn't have passed emissions. So, they fixed it and passed emissions. Maybe nto the best tuners.
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Verdad Gallardo Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
FYI.
There are 3 types of DTCs (Detected Trouble Code). Type A, B, and C.
Type A will illuminate the MIL (Malfunction Indicator Lamp) after the first occurrence. These are the most serious emissions failures that will have the greatest impact on engine performance and the most negative impact on vehicle emissions.
Type B will illuminate the MIL after the second occurrence of the same condition. The first occurrence will be a “pending” DTC (no MIL yet) until (and unless) a second occurrence is registered by the PCM before “xx” amount of drive cycles are completed without a second occurrence. If there is no second occurrence, then the pending DTC will vanish.
Type C typically have little or no real impact on emissions. These are issues that the PCM sees, but will not drastically effect engine performance or vehicle emissions. The automotive engineers/programmer are not allowed to illuminate the MIL for non-emissions related DTCs. These are stored in the PCM and can be retrieved with an OBD scanner, but you will never see an SES for it. A Type C DTC will not cause you to fail an OBD scan emissions test.
Type X = MIL turned off. This is what you want to set the respective DTC as if you plan to remove emissions equipment. You want to leave the test ‘on’, but the MIL should be set to Type X. Not all tuning software works the same though, so I’m not sure what the options are in different revisions of LS1 tuning programs. I know my old school LS1 Edit software uses Type X to kill the MIL but run the tests so you still pass an OBD scan.
There are 3 types of DTCs (Detected Trouble Code). Type A, B, and C.
Type A will illuminate the MIL (Malfunction Indicator Lamp) after the first occurrence. These are the most serious emissions failures that will have the greatest impact on engine performance and the most negative impact on vehicle emissions.
Type B will illuminate the MIL after the second occurrence of the same condition. The first occurrence will be a “pending” DTC (no MIL yet) until (and unless) a second occurrence is registered by the PCM before “xx” amount of drive cycles are completed without a second occurrence. If there is no second occurrence, then the pending DTC will vanish.
Type C typically have little or no real impact on emissions. These are issues that the PCM sees, but will not drastically effect engine performance or vehicle emissions. The automotive engineers/programmer are not allowed to illuminate the MIL for non-emissions related DTCs. These are stored in the PCM and can be retrieved with an OBD scanner, but you will never see an SES for it. A Type C DTC will not cause you to fail an OBD scan emissions test.
Type X = MIL turned off. This is what you want to set the respective DTC as if you plan to remove emissions equipment. You want to leave the test ‘on’, but the MIL should be set to Type X. Not all tuning software works the same though, so I’m not sure what the options are in different revisions of LS1 tuning programs. I know my old school LS1 Edit software uses Type X to kill the MIL but run the tests so you still pass an OBD scan.
