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Originally Posted by Jeepme
Been down this road before. My 95 failed for high NOX twice in four years here in Ohio. The first time I did all the usual tune up items and the re-test was worse. I went across the river to Kentucky where they sell the state mandated "re-formulated, low emission gas" and tried again with no change in NOX reading or any of the other items they measure. I took it to a state recommended emission repair shop. They put on a new convertor and it sailed right through the test. Two years and 25,000 miles later, same problem. High NOX reading with all other readings OK. I could find nothing wrong so I put on a new convertor. It passed.
I know high combustion temps cause high NOX readings. The EGR system is supposed to lower combustion temp. Everything appears to be working properly. I don't think the convertor should last such a short time. I am very interested in hearing what you find the cause of your high NOX readings to be. The emissions repair shop guy told me that a lot of cars they see with this problem have no clear cut cause but will pass with a new convertor.
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Hey Jeepme,
Does your Jeep have the Open Radiator System (with a Rad Cap and Overflow Bottle) or the Closed Radiator System? Maybe it was hot like mine and failed?
I just hope my new cat will last a long time. I can't afford to keep changing it every two years!
btw - I heard that during Emissions Testing they are supposed to put a big fan in front of the vehicle to help keep it cool since the vehicle is stationary and not moving. But I have yet to find such a caring shop. LOL Maybe I'll go get a high powered fan and bring it with me next time.
Saudade - Yes, my 88 XJ has individual fuel injectors on a rail so I guess I have MPI. WOO HOO! YAY!
Thx, Phil