86 pickup smog failed, please help. Did not pass NO

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Sep 20, 2010 | 07:50 AM

raiders42673

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86 pickup smog failed, please help. Did not pass NO

I have a 86 toyota pickup that failed smog the NO's were way to high. What could it be? Engine is 22r.

Last edited by raiders42673; Sep 20, 2010 at 08:04 AM.

Sep 20, 2010 | 07:59 AM

tgergen

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Quote:

Originally Posted by raiders42673

I have a 86 toyota pickup that failed smog the NO's were way to high. What could it be?

High NO is usually caused by excessive heat during combustion/lean condition.

I would try to retard the timing a bit. Also, make sure your thermostat is working correctly and coolant is topped off, etc, etc.

You can also "tweak" the airbox meter (or carb) a bit to richen it up.

Last edited by tgergen; Sep 20, 2010 at 08:00 AM.

Sep 20, 2010 | 08:03 AM

4Crawler

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EGR as well, make sure it is working perfectly and that all the ports/passages are totally clean and flowing well.

Might help to post what engine you have.