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Unread 09-05-2014, 11:02 PM   #1
badtoy1986
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1995 YJ Wrangler 
 
Join Date: Aug 2013
Location: Las Vegas, NV
Posts: 4
Yj Las Vegas SMOG help

I have a 95 YJ with a 5 speed, no AC no PS and the 2.5L 4cyl. I went to get my annual smog check done the other day and I failed due to high CO (Carbon Monoxide) at idle. All of my other numbers were passing. I believe a passing score is >1.2. I was getting ~2. I figured I would be okay, I did a full tune up less than a year ago. Changed spark plugs, wires, cap, rotor and O2 sensor.

After I failed I went and got a fresh oil change(I was due). and I swapped out the air filter. I drove for about and hour and took it back the smog place again without shutting it off. I did better but this time I was just under 2 at idle.

Do you have any suggestions on how I could fix this or where I should go to get it fixed or get some assistance getting it to pass.

Any help is appreciated.

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Unread 09-06-2014, 08:23 PM   #2
ksturgio
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1997 ZJ 
 
Join Date: Jun 2008
Location: Las Vegas
Posts: 2,827
Bad cat? Just a guess. May also be a bad O2 sensor, sometimes aftermarket ones don't seem to last as long. Maybe clean the throttle body as well. Try and seafoam it.
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Unread 09-07-2014, 06:24 PM   #3
badtoy1986
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1995 YJ Wrangler 
 
Join Date: Aug 2013
Location: Las Vegas, NV
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I replaced the O2 sensor about 11 months ago with a Boch OEM one. I have heard a little about Seafoam, but I am not sure it would fix the problem. I think its just a ritch idle. Maybe a little low idle (750RPM). I'm thinking its an injector not closing all of the way or high fuel pressure. I don't have any tools to check for ether of the those though.
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Unread 09-07-2014, 06:33 PM   #4
repairman
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1999 TJ Wrangler 
 
Join Date: Jan 2013
Location: NLV, NV
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The last time I had a vehicle fail for smog I bought a bottle of "guaranteed to pass" and it worked. It cleans the fuel system and I think makes it run leaner.
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Unread 09-07-2014, 11:00 PM   #5
badtoy1986
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1995 YJ Wrangler 
 
Join Date: Aug 2013
Location: Las Vegas, NV
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Quote:
Originally Posted by repairman View Post
The last time I had a vehicle fail for smog I bought a bottle of "guaranteed to pass" and it worked. It cleans the fuel system and I think makes it run leaner.
Thanks, ill try that. Did you run a full tank through it first? Do you remember why it failed?
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Unread 09-08-2014, 10:07 AM   #6
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,847
There is a great website out there called smogtips.com


Has all the info on how it all works and some will help troubleshoot your fail

Sent from underneath my Jeep
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Unread 09-08-2014, 12:19 PM   #7
Dr. Marneaus
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1973 FSJ Wagoneer 
 
Join Date: May 2006
Location: Las Vegas, NV
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High CO means its running rich. I don't think the 95 is carburetor, so I don't know how to fix that, but at idle it means you are pumping too much fuel at the lower RPM.

In your case, I'd try to get a bottle of the above stuff, or just some HEET, pour it in the tank, bomb around then highway for about 30 minutes, get that bastard running nice and hot, then go directly to the smog place. Should help.

I got sick of smogging my crap so before I went to Classic Vehicle plates I would just take my pile to my favorite mechanic (who does a lot of work on classics) and say "make it pass". they'd bill me for the smog check and like an hour of labor.
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Quote:
Well it ain't just the smoke and the traffic jam that makes me the bitter fool I am But this four-wheel buggy is A-dollaring me to death.
For gas and oils and fluids and grease, And wires and tires and anti freeze....And them accessories, Well honey, that's something else!
Well I figured it up and over a period of time, This four thousand dollar car of mine, Cost fourteen thousand dollars And ninety-nine cents, well now!
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Unread 09-08-2014, 07:22 PM   #8
badtoy1986
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1995 YJ Wrangler 
 
Join Date: Aug 2013
Location: Las Vegas, NV
Posts: 4
Quote:
Originally Posted by Dr. Marneaus View Post
High CO means its running rich. I don't think the 95 is carburetor, so I don't know how to fix that, but at idle it means you are pumping too much fuel at the lower RPM.

In your case, I'd try to get a bottle of the above stuff, or just some HEET, pour it in the tank, bomb around then highway for about 30 minutes, get that bastard running nice and hot, then go directly to the smog place. Should help.

I got sick of smogging my crap so before I went to Classic Vehicle plates I would just take my pile to my favorite mechanic (who does a lot of work on classics) and say "make it pass". they'd bill me for the smog check and like an hour of labor.
Can you PM me a recommended mechanic?
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