Car is 91 Integra LS.

1st TEST, failed NOx over 1500 ppm for both runs. Was told to change cat and O2 sensor.

Went home, changed oil, spark plugs, new coolant, new Denso 1 wire O2 sensor (91 DA), filled tank and dumped in a bottle of ISO HEET and ran it during the week till half full.

Got a new Catco cat on the morning of the 2nd TEST. Filled the tank and dumped in another bottle of ISO HEET (think that's where I ****ed up).

Ran the car on the freeway for about 30 minutes and then went to the smog place and let the car idle for another 10 minutes.

Smog guy ran the TEST again and failed both runs with very similair results but this time.. the smog guy told me I'm running hella lean (maybe cause of the ISO HEET) and also there was no reading for the O2 sensor.

Told me to check to see if the O2 sensor is working properly... so how do I do that? And also.. what do you guys think I should do to pass on my 3rd TEST?

Need help asap cuz I'm testing again this Saturday..

 

Hay man whats up?? Ok, before you go to take another test,recheck everything and do a fuel cleaning. And then,look for a smog shop that will only do a pretest for 20 buck so if it don't pass,its not in the computer. Spray some cleaner in the TB also to clean all the gunk out. Hope this help and you pass. GL

 

when you say 1 wire o2 sensor is there literally 1 wire or is there a positive and negative, if so you can do a continuity test with a volt meter, if not maybe buy another o2 and see if you end up with the same result. Also if your cat is in good shape, the sensors all work and the computer is working correctly you should be in the ball park smog wise, I mean if your rings are shot and you are passing a lot of oil it would effect your smog results. don't over do it witha all that additive stuff. follow the directions, more isn't always better.

 

Yeah I do believe that there is ONLY one wire on the O2 sensor.. maybe I should double check though.

When you say "passing a lot of oil".. do you meaning leaking oil cuz I'm kinda leaking from the cam seals and the oil pan.. will that affect the smog outcome?

 

Bump for more suggestions..

 

gj on heating the cat. your cat must be hot! use seafoam or a can of smog passing thing. keep searching google for the high NOX value for tips.

 

no I meant passing oil past the piston rings and into the combustion chamber, if oil is burning along with air and fuel I would have to believe it would affect emissions. when you start your car is there any blue smoke? Is there blue smoke while you are driving etc.

 

No smoke whatsoever coming out of the exhaust. Going to test again this weekend with no fuel additives...

 

did you replace both o2 sensors or just one. the is it 50 state legal or ca exempt?

 

The 91 Integra only has one O2 sensor right on the header.

Didn't understood your 2nd question but I'm assuming you're asking about my cat. I'm not sure but the shop owner did say it will pass smog when I asked him numerous times. The brand is Catco..

 

oh i see now

 

yea dont add too much "smog helping" stuff. My nox was too high too and I changed the cat and it passed.

 

I have a question regarding a similar problem.

My 91 CRX (Dx 16 valve, everything is stock, just did a tune-up plugs wires caps rotor, filters, and oil change.)won't pass smog due to my "NO (PPM)" being 967 and the max in CA is 870 or something in that ball park.

The mechanic I went to said I need to adjust the timing, another said I need to replace the CAT, the Smog Tech said I just need to let it cool before I run another Smog.

I don't want to waste another 80$ on a smog just to fail. Any suggestions?

 

well letting your cat cool down can cause a no pass. My buddy's gsr cat was kinda crap too so he told the tech to idle @ 4k rpm's to let the cat get REALLY hot, and he passed just by a couple. My timing was off4 degree and I did not pass, oh and my idle was a bit too high. try to get your timing on and get your cat hot and do a $20 or so pre-test. if you pass the pre-test then do the whole smog rather than failing right away.

btw why was the smog $80?? we do smog in sacramento for under $50 maybe $60max for a test only

 

it is the fact that it is a 91 CRX registered in a county in CA that needs a full functional and emissions check. So 50 for the smog 10 for cert, 20 for evap and for nox.

 

I work on an USAF base and the smog tech stopped charging me because he sees what I am going through.

Getting my Cat tested tomorrow morning to see if there is anything wrong with it.

I am going to get my timing retarded back down to 16 degrees, it is sitting at on the ***** 20. If I knock it down a notch or few hopefully that will help.

Is there anything else I can look at? I have no idea what additives I should be looking at or what the heck seafoam is or where I can get it...

I have a new O2 sensor I just cant install the damn thing because the radiator fan is in the way and so is the damn A/C unit.

I was looking at getting a new Cat just in case things go poorly tomorrow will any of these work for California:
link: http://www.partsgeek.com/catalog/199...converter.html

Sku #'s
6031-05073662

6031-05033712

6031-05033713

Thanks for the help in advance... and again it is a 91 CRX Dx 16 valve all stock(to my knowledge), with a new tune up done to it.(plugs, wires, rotor cap, rotor button and all filters. )