SPSERG
NAXJA Forum User
- Location
- Massachusetts
My wifes 94 Grand Cherokee just failed her MA smog check. It passed all areas great except NOx. Its a new car to her, and I know was well taken care of by the prior owner. I did a complete tune-up (plugs, wires, cap/rotor),K&N air filter, fuel filter, and the O2 sensor. Ran fuel injector cleaner thru prior to the check and got it good and hot. No check engine light or poor performance. What avenue should I pursue to get the NOx level down??
EDIT: I also cleaned out the TB with some Seafoam when I did the tune-up
EDIT: I also cleaned out the TB with some Seafoam when I did the tune-up
Last edited: