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Failed emissions test-high NO 700

posted by  jchiodi on  Wed Feb 18 08:37 CST 2004
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last visit: Mon Feb 25 11:26 CST 2013
[RELATED]

My 1990 16v 740 just failed local, (OHIO) emissions.

NO's were at 1770 parts per million, limit is 1330 ppm.

I had just run the engine at high RPM for about 15 minutes on highway and had filled up with 93 octane the day before on an empty tank.

I was told that this failure is usually caused by hot running engine?

Maybe I should have left out the high speed run?

Any suggestions as to how to reduce NOs? Or what failed parts I might need.

I have less then a year on amm. Haven't cleaned the flame trap lately though.


thanks,
jc
--
1985 740gle na, 1990 740gle 16 valve






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