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Failed emissions... need advice
Posted 13 December 2003 - 10:36 AM
The mechanic said this high NOx reading is usually caused by high temperatures. He further suggested it could be because of a faulty O2 sensor running lean or the catalytic converter being shot. I happen to know that the car has no cat (the rear one was removed by the previous owner).
I wanted to get some advice on what would cause the high NOx. I currently have no codes, having recently replaced the purge solenoid and cleared the code that it was causing.
Thanks for any help
Posted 13 December 2003 - 11:13 AM
Posted 13 December 2003 - 05:10 PM
The guy was right, NOx is high heat, and the possible causes he suggested are on the money.
You might be able to run some special cleaner through which would help you pass.
Posted 16 December 2003 - 12:55 PM
Posted 16 December 2003 - 02:33 PM
edit: removed lengthy EGR problem description per Legacy777's statement on the lack of EGR valve on these MY's. Sorry folks, it just sounded too similar to the problem we had with our '89 and NOx.
Posted 16 December 2003 - 02:42 PM
I'd probably do what you suggested and go with the carbon clean up even though it probably won't do much.
The 90-94 legacies did not have egr valves btw....
Posted 16 December 2003 - 05:15 PM
Subaru's in the Uk use "three way" catalysts - and consist of two cats, the front one I believe is the two way cat and the second one is a "one way"cat. If the US subie's are the same and I believe they probably are then if you have the rear cat missing on your vehicle then the catalyst system is not removing all harmful gases.
Posted 17 December 2003 - 08:06 AM
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