Another Exhaust Question

[krazibimmer]

this is what the emission station do at where i live, but some station are more strict. on 96 and newer car that equipped with obd2. they'll just hook up the scanner and check for code. you'll pass if there is no code and they'll fail you if there is code stored in the computer. but you could request to put the car on the dyno to test the emission. if you pass the emisson test on the dyno they'll pass you even if there is code stored on the car's computer. that what happen to me when i have my vw golf. some station will check under the car to see if there is a converter there. if they don't see it, they'll fail you and give you a fine for removing the converter. and some station even open your hood and match the engine code to the car's vin number.

[JoeWagon]

Sounds typical, but the place I go to will check for codes, and idle the car with a tailpipe tester (NOX? who knows). I just would like to know if I could disable the code myself and have it still pass. I wonder if they check values of the o2 sensor, maybe they don't even bother unless it has a code?

[krazibimmer]

i think they just check to see if there is code(s) stored in the car's computer. and i think the scanner that they have could only pull code(s).

[ashah000]

What if you erase them (with a datalogger) a second before you pull in.

[kjewer1]

DSMlink, like pocketlogger and other loggers, can read and clear codes. If it can completely reprogram the fuel, timing, and rpm parameters while you drive to mcdonalds, it should surely be able to do that Here is a tidbit worth mentioning when talking about DSMlink and emissions. When you connect with DSMlink, the ECU changes over to the DSMlink cmmunication protocol. An OBDII scanner will no longer be able to communicate. So be sure to not connect with DSMlink after you start the car. Should be an issue since you wont be tuning your WOT timing curve while trying to get inspected I'm sure Other than that, theres no way for them to know that DSMlink is there, and dSMlink doesnt give you any advantage in a test. DSMlink isnt in the business of lying to inspection stations to get you a sticker. But being able to clear old codes that could have failed you is a good thing.

[kjewer1]

Originally Posted by ashah000

What if you erase them (with a datalogger) a second before you pull in.

This is fine, and I would certainly do it. Just be aware that after clearing the ECU it will still run all the tests, and if the problem still exists, it will flag that DTC again and store the code. But if you have old problems that are now gone, or only pop up intermittently, this will help.