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Hi NOx 900

posted by  rjk2 on  Sat Feb 26 13:25 CST 2011
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last visit: Sat Jun 21 05:30 CST 2014
[RELATED]

Well, my '94 945 has failed emissions.
High NOx reading (about 35% over MAX).

I ran a bottle of Techron through w/premium gas and did a minor tune-up (cap, rotor & plugs, it was due).

Upon re-inspection, the NOx readings were somewhat higher than before. Differences between inspections were; the tune-up, premium gas, longer engine/CAT warm-up period & higher ambient temp.

Engine is running fine otherwise, smooth & strong.

I'm figuring it is time for a new CAT. Any dissenters? Am I missing something obvious?
--
1999 E320 1994 F150 1989 560 SL 1986 560 SL (deceased) 1988 300 TE (departed) 1994 945T (daughter's) 1988 244DL (fallow) 1986 242Ti (fallow) 1968 GT500KR (under restoration)






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