Quote:
Originally Posted by yaoxiao4
there isnt really a way for to tell that you are running custom tune though is there? AFAIK smog is only visual + codes |
I understand that if you live in an enhanced smog requirement area (most of California), the ASM2 emission test checks the vehicle current tune on the ECU against the manufacturer's tune. Thus, if there are dramatic changes to the engine timing etc. you can fail the test.