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Old 03-10-2009, 04:47 PM
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Default Lower NOx

I need to lower the NOx on the mighty 3FE in the '88 62. HC and CO pass but the standards for NOx have been lowered by nearly 50% in the last two years. Numbers on the truck are the same as they were two years ago but the new standards are busting his chops. Doesn't seem right that standards can get stricter on a truck that has always passed emissions before. Any help on lowering his NOx will be appreciated.
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Old 03-10-2009, 04:59 PM
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I feel your pain.. I had to get rid of my camry due to the stricter emissions.
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Old 03-10-2009, 05:01 PM
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Quote:
Originally Posted by wesintl View Post
I feel your pain.. I had to get rid of my camry due to the stricter emissions.
Drastic and not the way I will go with trusty steed Bart. I'll get a PO box in a non-"enhanced" emission testing area before selling my favorite Cruiser. If worse comes to worse, I'll move to New Mexico! Viva la no testing!!! Really, how can standards for a 20 year old vehicle suddenly be cut in half? They are legislating my truck off the road and it sure as hell puts out fewer pollutants than some I see on the road these days. Every time I pass the testing station at 6th Ave and I-25 the sign says the "health" of my vehicle is "Good". I guess I need to drive by the remote trucks more often where I can control my foot on the throttle better than the testers at the emission centers seem to be able to.
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Old 03-10-2009, 06:17 PM
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interesting to hear more...my friend just bought a 88 FJ62...think she might have trouble passing?
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Old 03-10-2009, 06:35 PM
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Doesn't make any difference what I think, now does it?
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Old 03-10-2009, 07:47 PM
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Sorry to hear this Steve, I'll be in the same boat when my time comes around I suppose.
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Old 03-10-2009, 07:50 PM
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somtimes its nice to have friends in HIGH places. Not in the front range counties.

Later
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Old 03-10-2009, 07:51 PM
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Thank God I "still live in El Paso County"
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Old 03-10-2009, 08:46 PM
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I would check to make sure you have proper EGR function. To little flow can raise the NOx levels as the EGR introduces inert gas into the combustion chamber "cooling" the combustion due to less to burn.

I would back the timing down a little. Retard the timing, the point of combustion will occur after TDC keeping cylinder pressure lower, that reduces heat.

If the first 2 don't work replace the catalyst. This is not cheap and I'm sure you would need new cats every emission time.

Our latest governor decided to clean Colorado up by making the standards very strict and upping the dollar amount for the fix it voucher. I think we are at the Cali/CARB standards now for older vehicles. Not a fair test to make vehicles pass at standards that are more strict then the original federal standards.
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Old 03-11-2009, 06:51 AM
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I have seen MANY a flanged cat in my day if you get my drift. bolts not allowed to rust and all that... fresh cats around a certain time of year, with an old stale one hanging around the rest of the year does wonders...
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