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Old 05-08-2012, 09:29 PM   #1
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Failed Emmisions (Arizona)

Just got back from the Emissions Test Station and my 91 yj with 160K miles and has been sitting for over 5 years, Failed. Not too surprised. It failed for Hydrocarbons and Carbon Monoxide. Hydrocarbons were not to far out of spec but CO was way up there. They offered suggestions of replacing the fuel injectors for the reason that they may be leaking and replacing the fuel regulator.
I'm fine with doing this as it probably needs it and I don't know the past maintenance history of this jeep. Any suggestions on what kind and where to buy them? I normally go to NAPA for items like this but if anyone has a better suggestion I'm open.

I did just drop the tank and flush it and replaced all engine fluids. I also replaced a few shaky vacuum lines and the plugs. They did have carbon build up on them. I will go ahead and replace cap, rotor and wires.

I did run the obd check and there are no errors that are related.

Any other suggestions are appreciated.

thanks,

Craig

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Old 05-08-2012, 11:19 PM   #2
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When is the last time it had an 02 sensor?

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Old 05-09-2012, 09:43 AM   #3
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A quick easy trick that might help, especially since it is close to passing, is put a couple of bottles of gas line antifreeze in the tank when you are down to about a quarter tank and get re-tested, make sure engine is all the way warmed up when they test.
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Old 05-09-2012, 11:31 AM   #4
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Quote:
Originally Posted by cozeinlb View Post
put a couple of bottles of gas line antifreeze in the tank when you are down to about a quarter tank and get re-tested
Pure snake oil. Additives in the gas tank do not help emissions, rather they can make it worse.

If I were you I would fill the tank up and put a bottle of injector cleaner in there to clean out the very likely gummed up injectors, then proceed to testing your MAP sensor and O2 sensor. Mine failed HC and CO because of a faulty O2 sensor. Don't go test emissions with a full tank and injector cleaner, wait a tank or 2 before you do.
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Old 05-09-2012, 12:32 PM   #5
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My plan now is to put in new cap, rotor, and wires. A new o2 sensor. I have to order new fuel injectors and regulator.

Do you think the Bosch injectors that I will get from NAPA will be ok? Any other options?

I think I did a good job flushing the tank and getting the fuel lines clean. I added Sta-Bil fuel additive to the first gas fill. It was recomended to help remove some of the built up varnish from the old gas.
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Old 05-09-2012, 01:06 PM   #6
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Originally Posted by AZ_Zoner View Post
Just got back from the Emissions Test Station and my 91 yj with 160K miles and has been sitting for over 5 years, Failed. Not too surprised. It failed for Hydrocarbons and Carbon Monoxide. Hydrocarbons were not to far out of spec but CO was way up there. They offered suggestions of replacing the fuel injectors for the reason that they may be leaking and replacing the fuel regulator.
I'm fine with doing this as it probably needs it and I don't know the past maintenance history of this jeep. Any suggestions on what kind and where to buy them? I normally go to NAPA for items like this but if anyone has a better suggestion I'm open.

I did just drop the tank and flush it and replaced all engine fluids. I also replaced a few shaky vacuum lines and the plugs. They did have carbon build up on them. I will go ahead and replace cap, rotor and wires.

I did run the obd check and there are no errors that are related.

Any other suggestions are appreciated.

thanks,

Craig

Change the regulator... I've failed on rigs before and thats what it turns out to be... If it has been bad for a while that could of killed your O2 sensor...
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Old 05-09-2012, 02:29 PM   #7
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Also change your oil if you have not yet, the vent tube from the valve cover can bring crap in from old oil and cause you to fail. It will help a pinch on CO and a fair bit on HC.
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Old 05-16-2012, 11:33 PM   #8
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Ok, I have replaced the fuel injectors, pressure regulator, o2 sensor, plugs, cap, and rotor. The thing seems to be running great! So back to the emissions test station tomorrow and hope it passes.

Keeping my figures crossed.

cb
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Old 05-18-2012, 11:16 PM   #9
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Well It Passed!! No problem.I may have replaced things that were good but right now I'm just happy it passed and I can go forward with getitng it registered and plates on it.

Now on to doing more interesting projects on it. Like lifting it.

Craig
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Old 05-18-2012, 11:59 PM   #10
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Scan and post your emissions results, if you cant scan them , type them in, Engine and vehicle speed, HC, CO, CO2, and NOx tailpipe numbers, along with MAX limits allowed.
PPM, % or GPM

4.0 or 2.5? Auto or manual?

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