SanDiegoXJ
NAXJA Forum User
- Location
- San Diego, CA
Ok, so I took the Jeep in today for a smog test pretty confident it would pass. It failed with the following reading:
15mph 1713rpm CO2 14.8% HC 13/89 CO .02/.66 NO 1138/517
25mph 1661rpm CO2 14.8% HC 9/54 CO .02/.80 NO 877/770
I have '94 4.0 with a Borla Header and Borla catback (both 50 states legal).
The exhaust was just put on a year ago along with a new Cat.
I'm guessing, given the readings of the HC and CO that the cat is fine.
I'm planning on getting an 02 sensor, but anything else that could raise the NOx that high? I over doubled the limit at 15 mph. Would just taking the car in cold help? All other readings not only passed but were below average.
15mph 1713rpm CO2 14.8% HC 13/89 CO .02/.66 NO 1138/517
25mph 1661rpm CO2 14.8% HC 9/54 CO .02/.80 NO 877/770
I have '94 4.0 with a Borla Header and Borla catback (both 50 states legal).
The exhaust was just put on a year ago along with a new Cat.
I'm guessing, given the readings of the HC and CO that the cat is fine.
I'm planning on getting an 02 sensor, but anything else that could raise the NOx that high? I over doubled the limit at 15 mph. Would just taking the car in cold help? All other readings not only passed but were below average.