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Unread 05-12-2013, 11:23 AM   #1
bill8bud
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Failed CA smog high NO

I failed CA smog yesterday.



I have read that this can be due to high combustion chamber temps.

Items I notice when running the jeep in the morning I can sometimes smell rotten eggs, aka bad cat. I changed the air filter before the test and made sure the jeep was warmed up.

I have replaced a cracked manifold last summer, Added a volvo efan.

The Jeep has 190000k on her and to be honest she is running really nice.

I am running 33s and have re-geared to match factory specs. Fuel mileage is about 13 MPG I drive city miles most of the time.

If you look at my exhaust pipe you can see it is black.
Also last time I smogged it I barely passed in the NO area of the test.

My cat is over 6 years old and my jeep did run rich for a few years.

Any ideas?

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Unread 05-12-2013, 11:49 AM   #2
czjeeper
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You could try a "de-carbon" treatment. Any decent shop should be able to do this for you.
If you have a build of of carbon on the top of the piston, it will trap heat in the chamber.
I'm guessing California Jeeps don't have EGR? EGR will lower combustion temps, but if you don't have it, it's not there to fix.
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Unread 05-12-2013, 11:57 AM   #3
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I have run Seafoam through it a few times in the last two years.


Checked ODB codes

11 No crank reference signal at PCM

33 No AC in Jeep

41 Generator field not switching properly
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Unread 05-12-2013, 01:03 PM   #4
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Can a bad ECT be cuasing this issue?
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Unread 05-12-2013, 01:35 PM   #5
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Well there is no EGR to contend with. I do not like to jump to conclusions but it sounds like it is time for a new 3 way cat.
I would eliminate the other cheaper things first like tune up check timing and making sure sensors are functioning.

Dwayne
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Unread 05-12-2013, 01:48 PM   #6
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I am looking into my code 11 which is vague but it normally points to a bad caps or sect which is the temp sensor for the computer.

I know we do not have an egr on this model.

A cat may be on the horizon

Thanks
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Unread 05-12-2013, 02:32 PM   #7
NonRubicon
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Passed HC and CO tests, but failed NOx.

Rotten egg smell from the exhaust + history of running rich for a couple of years = toasted cat.

Running rich is the easiest way to destroy a cat from the inside. Been there.
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Unread 05-12-2013, 05:45 PM   #8
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Quote:
Originally Posted by NonRubicon View Post
Passed HC and CO tests, but failed NOx.

Rotten egg smell from the exhaust + history of running rich for a couple of years = toasted cat.

Running rich is the easiest way to destroy a cat from the inside. Been there.
I agree, but before I put on a new cat, I'd run some "guaranteed to pass" or other cleaner through the gas, and a bottle of Miracle oil or ATF in the oil to clean everything out so it doesn't clog the new cat. Then do an oil change, tune-up, clean the throttle body and check all your sensors and vacuum lines, Then put on a new cat and O2 sensor.
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Unread 05-12-2013, 06:18 PM   #9
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Quote:
Originally Posted by Reno72 View Post
I agree, but before I put on a new cat, I'd run some "guaranteed to pass" or other cleaner through the gas, and a bottle of Miracle oil or ATF in the oil to clean everything out so it doesn't clog the new cat. Then do an oil change, tune-up, clean the throttle body and check all your sensors and vacuum lines, Then put on a new cat and O2 sensor.
I have run marvels, sea foam, and a heavy detergent oil. Through the oil system in the past year. When I took my valve cover off the rockers where clean.

The code 11 has not come back only new one is code 12 for the battery disconnect.

This CAT is most likely junk.

I can test the O2 sensor correct?
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Unread 05-12-2013, 07:27 PM   #10
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There are ways to test the O2 sensor, but I just bought a new one for my 90 4.2 at Autozone for $18.99. They even loan you the socket you need to change it out.
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Unread 05-13-2013, 10:11 AM   #11
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Cindy B has it. If you test high Nox you are running lean. Lean is unusal because the failure mode is rich for the fuel system. Start with the O2 sensor and check your fuel pressure(31 psi idle/39 with the vacuum disconnected). If you are running lean it is usually one or the other.
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Unread 05-13-2013, 11:25 AM   #12
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I did replace my ecu temp control and the jeep is running smoother.

My next step is to replace the CAT.

I wish there was a way to check my 02 sensor since I replaced it about 11 months ago with a Denso unit.

I checked my fuel pressure yesterday and found it within the range above.
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Unread 05-13-2013, 11:39 AM   #13
Que89YJ
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Did you try and resmog it yet after the temp. sensor? Rotten eggs and black smoke indicate rich not lean so you should have high CO not high Nox. The pressure was good and the fact you already replaced the O2 sensor along with the cracked manifold might might have burned out your cat.
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Unread 05-13-2013, 11:48 AM   #14
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I want to retest it as it sits now, but I think since it ran rich for so long that the CAT should be replaced before I do my next attempt.

I am doing a MPG test now to see if the change I did make any difference.

I am also planning on changing the oil before I go in for the next smog test.
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Unread 05-13-2013, 12:11 PM   #15
Que89YJ
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Reset the battery. The calibration needs to be reset by disconecting the battery for a long 10 count after changing sensors.
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