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Offline 95 Lowbuck

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Finally Failed
« on: December 06, 2017, 06:09:36 PM »
The wonderful state of California failed my Jeep on emissions today.
The Nox is my particular problem, both at 15 and 25 mph.
Engine is bone stock and never  been even close to failing before.
Motor is in pretty good shape at 180k miles, but still has original CAT.
Any suggestions?
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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

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Re: Finally Failed
« Reply #1 on: December 07, 2017, 10:19:49 PM »
Replace the cat.  Cats are probably good for 100K or about 10 years.  If your exhaust is stock, I'd go with a bolt-on Magnaflow.  You might have a little trouble getting it off the muffler but it's worth it, I think.  It's a PITA to deal with a welded exhaust and mods later down the line.  The only problem is that the CA-Legal cat costs $100 more than the 48-State.  Funny since I passed emissions with one from before they made a CA specific cat.
« Last Edit: December 08, 2017, 04:14:41 PM by Jeffy »
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My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline 95 Lowbuck

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Re: Finally Failed
« Reply #2 on: December 08, 2017, 03:34:13 PM »
 Yup, that's what I'm thinking.
$208.00 for the Cat, $150 to install.
Previous owner had the whole system welded.
Will put some miles on it before retest.
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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

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Re: Finally Failed
« Reply #3 on: December 08, 2017, 04:22:11 PM »
They will probably cut the flange off the downpipe and weld it directly to the cat.

If the flange is still there, you might consider getting a bolt-on cat-back like the DynoMax for $185 and installing it yourself.
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Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline 95 Lowbuck

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Re: Finally Failed
« Reply #4 on: December 08, 2017, 07:05:15 PM »
Yea, at some point the previous owner welded up all the slip joints, no flanges.
When they put on the new Cat today it had to be welded up.
Nice picture of your flop btw.
Looks like somewhere on the Rubicon.
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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

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Re: Finally Failed
« Reply #5 on: December 08, 2017, 07:43:12 PM »
Quote from: 95 Lowbuck on December 08, 2017, 07:05:15 PM
Yea, at some point the previous owner welded up all the slip joints, no flanges.
When they put on the new Cat today it had to be welded up.
Nice picture of your flop btw.
Looks like somewhere on the Rubicon.
The V Groove, just after Lil Sluice.  Wasn't paying attention and went up the wall too far and the rear tire fell into a hol.  Then it flopped on it's side.  It was a very slow flop.

http://4bangerjp.com/forums/index.php/topic,11646.0.html
« Last Edit: December 08, 2017, 07:44:31 PM by Jeffy »
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Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline 95 Lowbuck

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Re: Finally Failed
« Reply #6 on: December 12, 2017, 06:46:00 PM »
Well after a new Cat it passed, just barely.
Still very high on the NOX.
They said it was running too lean preventing the Cat from working properly.
All other smog levels were way below average.
Checked for exhaust leaks before the Cat, nether the muffler shop or I could find any.
If it's too lean could it be injectors (original), 02 sensor (replaced after a cracked manifold 4 years ago),
weak fuel pump (original)?
The smog station told me it was most likely carbon build up from running cheap gas.



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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

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Re: Finally Failed
« Reply #7 on: December 13, 2017, 01:21:39 PM »
Do you ever take the Jeep on long highway trips?  That helps get rid of the carbon.  Or else seafoam.

You can check the fuel pressure on the fuel rail.  There's a schrader valve.  You just need to get a fuel pressure gauge or set up a permanent one on the fitting.  That will tell you if the fuel pressure is correct.  Might want to run some FI cleaner through the system.  Or else get new injectors.
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Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline bootguy

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Re: Finally Failed
« Reply #8 on: February 10, 2018, 02:07:03 AM »
If you can get some ethanol free gas it will run hotter and clean your system better than Seafoam ever will alone.
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1994 Jeep Wrangler, 2.5L, automatic, 2.5" lift, 4:88 gearing, 33" tires, 2.5" exhaust from manifold back, air restrictor removed.

Offline 95 Lowbuck

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Re: Finally Failed
« Reply #9 on: February 12, 2018, 05:54:54 PM »
Quote from: bootguy on February 10, 2018, 02:07:03 AM
If you can get some ethanol free gas it will run hotter and clean your system better than Seafoam ever will alone.
That's a pretty good idea!
I wonder if running a hotter plug for awhile would do anything.
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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline bootguy

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Re: Finally Failed
« Reply #10 on: February 17, 2018, 08:05:09 PM »
FYI: The 2.5 is very picky on plugs.
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1994 Jeep Wrangler, 2.5L, automatic, 2.5" lift, 4:88 gearing, 33" tires, 2.5" exhaust from manifold back, air restrictor removed.

Offline 95 Lowbuck

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Re: Finally Failed
« Reply #11 on: February 18, 2018, 07:19:46 AM »
Quote from: bootguy on February 17, 2018, 08:05:09 PM
FYI: The 2.5 is very picky on plugs.
Yup, running stock Champions right now.
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1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.
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