Webster
NAXJA Forum User
- Location
- L.I. New York
Took the 88 4.0 xj to get inspection the other day. last years results were great! Did An exhaustive search.
2003
Limits------------ Test
HC-----2.00---------------0.41
CO----40.00---------------2.24
NOx----4.00---------------0.92
This year 1st Test (limits have changed)
Changed mufler and cat high flow
3 weeks before test
Limits-------------- Test
HC-----1.60---------------0.15
CO----40.00---------------4.33
NOx----2.50---------------2.82
Changed air filter, cap & rotor(all fouled)
2nd test
Limits-------------- Test
HC-----1.60----------------0.29
CO----40.00----------------6.02
NOx----2.50----------------2.58
Cleaned throtle body, Jeep top end cleaner, New plugs,techtron injector cleaner( was in tank during test), oil & filter, and 1/2 the vacume set(front of valve cover, small 1 from rear was replaced 4 months ago) air box side( brakes are much better, and idles great! like new).
3rd test
Limits-------------- Test
HC------1.60----------------0.43
Co-----40.00----------------5.80
NOx-----2.50----------------2.48
It just passed! What do I need to do to make it closer to last year so I don't go through this again? I bought a new egr valve(not looking foward to installing), and O2 sensor have not installed yet. Should I buy the block temp sensor or anything else? Why is my NOx so high?
Thanks for any help.
Webster*
2003
Limits------------ Test
HC-----2.00---------------0.41
CO----40.00---------------2.24
NOx----4.00---------------0.92
This year 1st Test (limits have changed)
Changed mufler and cat high flow
3 weeks before test
Limits-------------- Test
HC-----1.60---------------0.15
CO----40.00---------------4.33
NOx----2.50---------------2.82
Changed air filter, cap & rotor(all fouled)
2nd test
Limits-------------- Test
HC-----1.60----------------0.29
CO----40.00----------------6.02
NOx----2.50----------------2.58
Cleaned throtle body, Jeep top end cleaner, New plugs,techtron injector cleaner( was in tank during test), oil & filter, and 1/2 the vacume set(front of valve cover, small 1 from rear was replaced 4 months ago) air box side( brakes are much better, and idles great! like new).
3rd test
Limits-------------- Test
HC------1.60----------------0.43
Co-----40.00----------------5.80
NOx-----2.50----------------2.48
It just passed! What do I need to do to make it closer to last year so I don't go through this again? I bought a new egr valve(not looking foward to installing), and O2 sensor have not installed yet. Should I buy the block temp sensor or anything else? Why is my NOx so high?
Thanks for any help.
Webster*
Last edited: