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Failed smog, hi NOX 900

posted by  dls on  Tue Feb 21 21:01 CST 2012
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last visit: Mon May 28 11:52 CST 2012
[RELATED]

Have 1993 940nt failing CA smog. Passed in 08 an driven less than 500 miles since(due to illness).Checked all codes - all okay, checked operation all things on OBD1 all work. EGR is working but not sure works at running temp? what is temp sensor reistance when Hot? Any other clues? Don't want to parts swap as most indie suggest. Not willing to invest more than $500. Darrell








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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

If you don't want to spend more than $500 and it costs more to fix it, I may be interested in buying the car.
bikeguy (at) fastmail (dot) fm



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

Specs are in the FAQ. For high NOX, look for a vacuum leak somewhere.
--
See the 700/900 "FAQ" at the menu bar top screen left side.



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

Thanks, I'll check FAQ'S. When eng is cold have vac going to EGR but when warms no vac? Have 102K on 940.



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

No mention of EGR TEMP resistance in FAQ.



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

i had a watercooled vw that failed for NOX = bad cat.

since not so many miles in a year maybe you could take it out on the highway,
get it good and hot and do maybe a couple of italian tuneups to see if that helps.


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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

If you've driven only 500 miles in 4 years that's probably it. NOx readings will be high when you don't take it. Did you take it for a good drive and get the catalytic nice and hot?


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