stewie
NAXJA Forum User
i went through more than 15 pages when i searched for emissions. i didnt find anything that really answers my issue though, but that doesnt mean that i didnt miss something.
vehicle: 95 xj 4.0
situation: can not pass AZ emissions testing (done on the dyno machine) due to high NOx levels. i have gone in for 3 tests so far. 3.00 is the limit and so far i have scored in order of tests preformed, 3.44, 3.17, 3.39
my repair attempts: after first failure- new air filter, clean TB and intake hose, clean ccv lines where the oil dripps onto the air filter, seafoam treatment (total of one can in vac line, 1 can in gas tank). that dropped me from 3.44 to 3.17. i know that i have a sizeable crack as does most stock headers for the 4.0. for retest 1, i cleanned off the area arround the crack on the header and applied some copper RTV. i waited about 90 min and took it in for a retest. i failed with 3.39. when i got home i looked and my repair attempt had been stripped away.
here is a visual referance on my failure sheets.
and this is what the info packet they give me says about NOx
as far as i have been able to gather from searching, the egr was eliminated in the HO engines right?
im wondering if the crack in the header could be causeing me to run too lean? if this is a possible cause then what are some options to repair. i just got laid off on friday so $$ is a little tight right now and time is as well as the registration expires at the end of the month.
im also wondering if the cracked header caused the O2 sensor to go out causing it to run lean?
if there are any more ideas, please let me know.
help in this issue is greatly appreciated.
TIA
stewie
vehicle: 95 xj 4.0
situation: can not pass AZ emissions testing (done on the dyno machine) due to high NOx levels. i have gone in for 3 tests so far. 3.00 is the limit and so far i have scored in order of tests preformed, 3.44, 3.17, 3.39
my repair attempts: after first failure- new air filter, clean TB and intake hose, clean ccv lines where the oil dripps onto the air filter, seafoam treatment (total of one can in vac line, 1 can in gas tank). that dropped me from 3.44 to 3.17. i know that i have a sizeable crack as does most stock headers for the 4.0. for retest 1, i cleanned off the area arround the crack on the header and applied some copper RTV. i waited about 90 min and took it in for a retest. i failed with 3.39. when i got home i looked and my repair attempt had been stripped away.
here is a visual referance on my failure sheets.
and this is what the info packet they give me says about NOx
as far as i have been able to gather from searching, the egr was eliminated in the HO engines right?
im wondering if the crack in the header could be causeing me to run too lean? if this is a possible cause then what are some options to repair. i just got laid off on friday so $$ is a little tight right now and time is as well as the registration expires at the end of the month.
im also wondering if the cracked header caused the O2 sensor to go out causing it to run lean?
if there are any more ideas, please let me know.
help in this issue is greatly appreciated.
TIA
stewie