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Emission Testing Texas Style

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Old Jul 31, 2012 | 12:16 PM
  #151  
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From: And the horse he rode in on...
Originally Posted by Frankenrex
I just noticed that my Nox went up for some reason.
Man, I have no idea what's going on with this thing.

Edit: and yeah, the AC is nice. At noon here lately the Envirosafe couldn't keep up. I got 60 degrees in side he car after I charged it with Difouroethane, on a 102 degree day. Not freezing, but it'll do.
Whats your center vent temp with recirc on?
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Old Jul 31, 2012 | 12:49 PM
  #152  
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From: Euless, TX
Originally Posted by jackhild59
You shouldn't have any O2 left over. The cat should use it all up. Excess HC and O2 should react, using up all the O2 and more of the HC's.

Your NOx is pretty high for a rotary, too, doesn't make any sense.

Is it possible that the cat was cold and did not properly light off?

Is it possible that the gas was really old?

Cats are directional. Is it *possible* that the cat is installed backwards?
Brand new Magnaflow cat, just installed a week ago - had about 175 miles on it. Cat was hot - the results shown are from an authorized retest, so it had been through one cycle already. Gas was three days old at the time of the test (filled up, 16.5 gallons on the 25th.)
I will check on the directionality.

Yeah, that extra O2 with a new cat is baffling me. Will buy locally next time, so I can complain if it sucks. May just take the thing to a mechanic - I hate working on emissions crap, particularly on my daily. Should have put my efforts into the '86 with fewer miles I had...
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Old Jul 31, 2012 | 01:06 PM
  #153  
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From: Euless, TX
Originally Posted by jackhild59
Whats your center vent temp with recirc on?
I got 60 degrees F out of the center vent , recirc on, blower on max, on a 102 day, on the highway. Charged using 2 10 oz. cans of duster, definitely lost some purging the charge hose, unable to get all out of the can, etc., so should be close to the calculated 16 oz. needed.

The only thing I've done to the system in this car is replace a low-side hard line with a hole in it (actually, two different ones - stuff was rubbing on them from prev. owner) and a new dryer. Had Freeze-12 in it when the second line cracked, recharged with Envirosafe when that was replaced, and that was in there until it mysteriously got out (wink) to be replaced with R152. Vacuum held for about an hour before I charged it.

It gave me just under 50 degrees on the way to work this morning, about 85 degrees outside.

Not freezing, but pleasant.
I also post in the thread where you introduced R152, if you don't ant to clutter the emissions thread with this.
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Old Aug 4, 2012 | 06:30 PM
  #154  
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From: Euless, TX
Woot! it passed.
A bit more driving on the new cat, new oxygen sensor, oil change this morning, and 5 gallons of E85 in half a tank of "normal" 87 octane gas.
Interesting that there's so much O2 left over with the E85.
Attached Thumbnails Emission Testing Texas Style-1990-fc-emissions-8-4-12.jpg  
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Old Aug 4, 2012 | 06:42 PM
  #155  
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Better copy of the report
Attached Thumbnails Emission Testing Texas Style-1990-fc-emissions-8-4-12.jpg  
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Old Aug 7, 2012 | 01:03 PM
  #156  
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From: Euless, TX
Now for the best part: I discovered on Sunday while changing out the starter that I had forgotten to plug in the new oxygen sensor. I passed, with no oxygen sensor - and the check engine light didn't come on until another 10 miles or so of driving.
E85 is good stuff...
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