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Failed emissions test - high NOx 200 1990

posted by  jwalker on  Thu Dec 21 11:47 CST 2006
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last visit: Fri Jun 6 08:39 CST 2014
[RELATED]


Open to any suggestions that will help me pass!! I have been reading the archives so I have some ideas.

BTW - Can a clogged flame trap cause high NOx?

Car runs good, but idles rough when warm - probably throttle body?

Background:

-Fairly recent oil change
-Fresh tune-up including plugs, rotor, cap, wires and air filter
-Needs flame trap and throttle body cleaning
-Ancient (probably original) O2 sensor and catalytic convertor

My plan is to hit the flame trap and throttle body first. Then on to vacuum leaks. I know the check valve at intake manifold has a vacuum leak (needs new hose).

Any other ideas? I really don't need to buy a new O2 sensor and/or cat right now :)


Thanks,
Jim
--
90 244DL 275k - All original drivetrain :)






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