my 91 won't pass CA Smog, Nox fails? - ZR-1 Net Registry Forums

zora1 · 01-07-2004

hi
I have a stock 1991 ZR1 with 27k miles. I am original owner, car has been garaged for almost 9 years.
I have put 12k on it since May '02, and it passed CA smog then, but not now?
Smog shop says it failed the NOx and passed everything else.
My mechanic says he doesn't have the equipment to test the NOx.

Has anyone came across this problem while trying to smog their car?

Changed plugs (two had small amount of oil on them, but all looked good - considering they were originals).
Changed fuel filter, it was yucky.
The car burns about a quart of motor oil a week.

Maybe the cat/convertor?

I appreciate any advice! - Thx

01-07-2004	#1
zora1 Join Date: Jan 2004 Location: NorCal Posts: 3	my 91 won't pass CA Smog, Nox fails? hi I have a stock 1991 ZR1 with 27k miles. I am original owner, car has been garaged for almost 9 years. I have put 12k on it since May '02, and it passed CA smog then, but not now? Smog shop says it failed the NOx and passed everything else. My mechanic says he doesn't have the equipment to test the NOx. Has anyone came across this problem while trying to smog their car? Changed plugs (two had small amount of oil on them, but all looked good - considering they were originals). Changed fuel filter, it was yucky. The car burns about a quart of motor oil a week. Maybe the cat/convertor? I appreciate any advice! - Thx