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
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1985 740gle na, 1990 740gle 16 valve
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