Post by
Nismo_Freak »
https://forums.nicoclub.com/nismo-freak-u248.html
Sat Jul 27, 2002 4:12 pm
If you have a re-oilable filter such as a K&N the oil often can gunk up the MAS. Buy a can of carb cleaner and spray the sensor to de-gunk it and this will at least give you a clear primary 02 signal to correct A/F ratios. Pull the plugs and inspect them. Look for electrode damage, oil residues, carbon buildup, and coloration. That will tell you if you are running too rich off the bat. Black smoke could also be oil getting past the rings. Look for an oily residue or an oil fouled plug to tell if your engine has begun to lose compression and has severe blow-by.