Having problems with your 1987 Acura Legend ?

SMOG test passed ALL except "NOx" results were 696 Limit is 585. Any easy fixes ??

Posted / edited by AnonymousUser on : 17-12-2018

Answers :

I've had good luck using CRC's "Guaranteed to pass" fuel system cleaner. Follow the directions exactly. It should bring all the smog numbers down--perhaps get your NOx number low enough.

If the EGR valve is not working properly, it will lead to high NOx. Check for a leaky vacuum diaphragm on this valve. It will not only keep the EGR from working when it should, but also lead to a lean mixture that burns hotter, thus generating even more NOx.

Check for vacuum leaks. Any extra air that makes the mixture lean will contribute to high combustion temperatures and high NOx--even if the EGR valve is working.

Finally, if those steps don't work, it could be your catalytic converter is getting old and inefficient. Don't be surprised if you need a new 'cat.
Repair Help & Product Troubleshooting for 1987 Acura Legend

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