Catakytic Coverter Questions - JeepForum.com
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post #1 of 16 Old 01-03-2014, 12:53 PM Thread Starter
PR1AWRet
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Catakytic Coverter Questions

95 Jeep Cherokee 4.0, 4x4, federal standards, automatic, 175K, OBD I. Falls under the STAR program this year.

Catalytic Converter (rattles pretty bad)
Can I just get a federal one?
Why does it require a "professional smog tech" to have one installed?
The (new) guy where I go to get smog tested is anal retentive and will probably ask for the shop that did the repair. First time I've brought a vehicle there and it failed. It's also a Star tests center and does repairs now and not a pass or free retest anymore. ASAP here in Imperial Beach. Time to find another place.

----CO2---O2---MAX---AVE---MEAS(HC)---MAX---AVE---MEAS(CO)---MAX---AVE---MEAS(NO)
15 14.3----0.9---63-------26 -----53--------------0.46-----0.04---0.21-------------460-----175-----770
25 14.2----0.7---38-------16------31--------------0.56-----0.05---0.13-------------539-----188-----528

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post #2 of 16 Old 01-03-2014, 06:10 PM
brokenyoujoint
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I have a high flow banks cat that isnt CA legal. If you can find a smog guy who crawls under your jeep to look at a cat that dude WANTS to fail you BAD. Ive had that cat for 13 yrs now and it passes w/o issue. Im OBDII. not sure if that helps you at all.
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post #3 of 16 Old 01-03-2014, 09:44 PM
Xpress
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Don't think there's much difference between a normal run of the mill CAT and a CA/Federal style CAT...

All about that unibody life.
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post #4 of 16 Old 01-04-2014, 07:26 AM
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Quote:
Originally Posted by PR1AWRet View Post
95 Jeep Cherokee 4.0, 4x4, federal standards, automatic, 175K, OBD I. Falls under the STAR program this year.

Catalytic Converter (rattles pretty bad)
Can I just get a federal one?
Yes
[/QUOTE]Why does it require a "professional smog tech" to have one installed?[/QUOTE] If you DIY, it doesn't. If a shop does it as an EMISSIONS repair, it must be a licensed smog repair shop and tech. If it is done as a MAINTENANCE, any shop can do it.

[/QUOTE]The (new) guy where I go to get smog tested is anal retentive and will probably ask for the shop that did the repair. First time I've brought a vehicle there and it failed. It's also a Star tests center and does repairs now and not a pass or free retest anymore. ASAP here in Imperial Beach. Time to find another place.

----CO2---O2---MAX---AVE---MEAS(HC)---MAX---AVE---MEAS(CO)---MAX---AVE---MEAS(NO)
15 14.3----0.9---63-------26 -----53--------------0.46-----0.04---0.21-------------460-----175-----770
25 14.2----0.7---38-------16------31--------------0.56-----0.05---0.13-------------539-----188-----528[/QUOTE]

It looks like it is running pretty rich. I fix that first (probably O2 sensor). I highly recommend the Smog Tests Only on the corner of 11th and G, downtown. Ray and Mary are long time friends and colleagues. Tell them I sent you.

Happy Trails, Moose KF7ITJ
"The difference between men and boys is the price of their TOYS!"
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post #5 of 16 Old 01-04-2014, 07:28 AM
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Quote:
Originally Posted by Xpress View Post
Don't think there's much difference between a normal run of the mill CAT and a CA/Federal style CAT...
Physically, there isn't. Chemically, there is a lot. Plus, the fed one won't have the laser-inscribed numbers that CA requires now.

Happy Trails, Moose KF7ITJ
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post #6 of 16 Old 01-04-2014, 10:59 AM Thread Starter
PR1AWRet
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Thanks for the responses. When the son gets home with a gutted but trussed D30 for his Comanche, I'll run a check on the O2 sensor to make sure it's not lazy or not working. I put a NTK O2 sensor in about 3 years ago. 2 years ago it passed with all the numbers around average.
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post #7 of 16 Old 01-06-2014, 12:08 PM
sdmoose429
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Quote:
Originally Posted by PR1AWRet View Post
Thanks for the responses. When the son gets home with a gutted but trussed D30 for his Comanche, I'll run a check on the O2 sensor to make sure it's not lazy or not working. I put a NTK O2 sensor in about 3 years ago. 2 years ago it passed with all the numbers around average.
NTK makes most of the OE sensors, and they are good, but usually Bosch is the only thing that will work in a Jeep.

Happy Trails, Moose KF7ITJ
"The difference between men and boys is the price of their TOYS!"
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post #8 of 16 Old 01-06-2014, 04:07 PM
mattman998
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Hey Moose - what would you recommend to someone with a TJ that needs a new cat? When I first got my Jeep it needed new cats, and all I could find was the OEM part. $1800 installed. Do you know of any aftermarket cats that are CA legal? Or perhaps any workarounds to get a Federal part to work and pass?
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post #9 of 16 Old 01-07-2014, 06:27 AM
brokenyoujoint
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I'd recommend going to a yard and pulling a cat off of a cherokee. 20 bucks or so. Assuming they are allowed to sell which I wouldnt see why not but who knows in CA.
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post #10 of 16 Old 01-07-2014, 09:27 AM
sdmoose429
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You are correct, sir. California doesn't allow resale of used cats.

Happy Trails, Moose KF7ITJ
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post #11 of 16 Old 01-07-2014, 09:31 AM
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Quote:
Originally Posted by mattman998
Hey Moose - what would you recommend to someone with a TJ that needs a new cat? When I first got my Jeep it needed new cats, and all I could find was the OEM part. $1800 installed. Do you know of any aftermarket cats that are CA legal? Or perhaps any workarounds to get a Federal part to work and pass?
If your Jeep has a FEDERAL certification, then you can use a federal cat. If it has 50 state cert, it must be a CA cat.
Jeeps are funny about smog. Call me.

Happy Trails, Moose KF7ITJ
"The difference between men and boys is the price of their TOYS!"
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post #12 of 16 Old 01-07-2014, 11:34 AM
mattman998
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Quote:
Originally Posted by sdmoose429 View Post
If your Jeep has a FEDERAL certification, then you can use a federal cat. If it has 50 state cert, it must be a CA cat.
Jeeps are funny about smog. Call me.
Mine is fine, now that I spent the $1800 like a sucker
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post #13 of 16 Old 01-08-2014, 09:37 PM
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I bought a Magnaflow California legal cat for $250 +/-, and had it installed for $50. Went right next door and had it smogged. Passed. I've never had a tech crawl under the car. If you didn't mention it they would never know it was ever changed. Sorry about the $1800. Hope the karma circles back around to whoever charged you.

Current - 1993 Wrangler 2.5 - mostly stock
Previous - 1989 Comanche Pioneer 4x4 Long Bed/Metric Ton Pkg
4.0, AT, D44 w/ Trak-Lok RIP
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post #14 of 16 Old 01-12-2014, 09:58 PM
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If you have too many issues trying to get your Jeep to pass smog like I did, find a friend in Imperial County and register out there. They do not use the dyno test out there. They only rev the engine for the test. I replaced the CAT (twice), the O2 sensor, temp sensor, thermostat, pressure regulator on the fuel rail, also did a valve job, new plugs, dist cap, rotor and wires. There wasn't much I didn't replace under the hood and I still couldn't get it to pass here in SD.
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post #15 of 16 Old 01-13-2014, 11:54 PM
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Quote:
Originally Posted by jkruegel View Post
If you have too many issues trying to get your Jeep to pass smog like I did, find a friend in Imperial County and register out there. They do not use the dyno test out there. They only rev the engine for the test. I replaced the CAT (twice), the O2 sensor, temp sensor, thermostat, pressure regulator on the fuel rail, also did a valve job, new plugs, dist cap, rotor and wires. There wasn't much I didn't replace under the hood and I still couldn't get it to pass here in SD.
Did it fail for Nox? I'm assuming so since it passed a TSI (Two Speed Idle) test. If the head was surfaced, it may have raised the compression ratio just enough to cause high Nox. Also, was the O2 a Bosch?

Happy Trails, Moose KF7ITJ
"The difference between men and boys is the price of their TOYS!"
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