Question about 1988 Acura Legend

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Acura Legend 1988

My car did not pass the test only. They said that it was because it was not burning enough fuel but, instead it was creating another type of polutant. I need to find out what needs to be repaired of fixed in order to solve my problem. Thank You

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  • johnh677 Apr 24, 2009

    1990 Legend
    On mine it did not pass NO and CO levels. The printout says that it is too rich fuel/air mixture.



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You can get some idea of what you need done by the smog stations readout.I suppose you looked at the computer codes under the passenger seat, the O2 sensors could be faulty. If you have done a total tune-up after the car was running rough, you may have to replace the Catalytic Converter. It's job is to be so hot it can finish any unburnt fuel, but it can be "spent" if the car was abused. The final engine thing is the exhaust valve adjustment, but you can hear clicking if the clearances are too great.

Posted on Aug 21, 2010


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

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.

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