Here is an update !! I was told to try some stuff in the gas tank called Lucas to help with excessive carbon build-up. Well it really helped, it almost brought the nox level to passing but not quite. I live in California and the max nox is 785 I am now at 938
does anyone know of a fairly inexpensive way to get the excessive carbon buildup down. I am nearly out of money available to spend on the car. I have already spent over 1,500.00 trying to get it to pass smog