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Thread: Need Help Diagnosing Problem

  1. #16
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    Re: Need Help Diagnosing Problem

    Quote Originally Posted by OlneyJeeps View Post
    My vote is clogged cat.
    Loosen bolts at cat input, creating a leak and eliminating back pressure. If cat was clogged, it should run better. This is for diagnosis only. You would probably get O2 sensor code doing this.
    Front cats or rear cat? 05 has 3, which I already knew and have located on vehicle but appreciate all guidance and help being offered!

    Sent from my SM-G950U using Tapatalk

  2. #17
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    Re: Need Help Diagnosing Problem

    Happened to me years back. All off a sudden it was bogged down and drove 10mph all the way home. Bad cat

  3. #18
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    Re: Need Help Diagnosing Problem

    Quote Originally Posted by greyst View Post
    Front cats or rear cat? 05 has 3, which I already knew and have located on vehicle but appreciate all guidance and help being offered!

    Sent from my SM-G950U using Tapatalk
    If there is a flange you can disconnect in front of the third Kat, I would start there, see if there's a difference. If no difference, reconnect then loosen connections on the other cats independently so you can test independently. If all else fails, loosen connection before both cats and see if it works. You might just have to replace all three. If you want to be real cheap, and the cats have not come apart, you can take them out and wash them with muriatic acid. Many times when they go bad it is because the ceramic is broken, so you will hear the classic marbles in the tailpipe sound. If it is broken you just need to replace.
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  4. #19
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    Re: Need Help Diagnosing Problem

    I cannot locate that cat I thought I had. Sorry.
    Non-College Educated Working Class White Deplorable....

  5. #20
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    Re: Need Help Diagnosing Problem

    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  6. #21
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    Re: Need Help Diagnosing Problem

    Quote Originally Posted by OTR-93YJ View Post
    I cannot locate that cat I thought I had. Sorry.
    Did you check the pound?
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  7. #22
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    Re: Need Help Diagnosing Problem

    Another test you can do is with an infrared scanner purchased from Home Depot for about $20. After driving the jeep around the block a couple times to warm it up, take temperatures at the inlet and the outlet of each cat. Outlet should be 50 2 100 degrees hotter than the input. The important thing to look for is that the output is hotter than the input. If it is not, the cat is not working.

    Another key indicator is when you have the marbles in exhaust sound which indicates that the ceramic Has Broken
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  8. #23
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    Re: Need Help Diagnosing Problem

    Drove the jeep around to get it up to operating temp. It was not happy.

    Once I returned home, the cats weren't glowing red and temps were lower at output than input. I didn't grab a pen and paper before leaving so I don't have the numbers to share.

    Before it was warmed up, it would not go above 2000 rpm, after warming up, it was a struggle to go any higher than 1500 rpm.

    The forecast looks like it will be cooler this week, I'll try again later in the week and write down the data. I wanted to see how it would run since I have not fired it up since the issue started.

    Rock_starr offered to come by this week with his scan tool so we can pull data to help diagnose. I'll post up with what we find.

    Sent from my SM-G950U using Tapatalk

  9. #24
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    Re: Need Help Diagnosing Problem

    Hope you get it figured out!
    Quote Originally Posted by Oscar_Mike 2013
    Truth be told, I like wheeling with you and Willygoat. Always a fun ride (with clothes on or off)
    Quote Originally Posted by Oscar_Mike 2013
    You are so weird. I like it!!

    2014 JK Rubicon Granite Crystal

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  10. #25
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    Re: Need Help Diagnosing Problem

    The fact that temp is lower on output says the cat is not working : cat is like furnace. If ceramic gets soot coating, the ceramic becomes insulated and will not ignite...cascading failure, soot builds till clogged.

    A good "acid test" is loostening connection at collector...release of backpressure should allowvtonbe driveable (but will trigger CEL).

    If is just clogged (you don't hear "marbles" when shut off), it is plausable you could drill small hole in pipe just before cat, spray can of carb cleaner in cat to partially clean....once ignites, it should burn istseld clean
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  11. #26
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    Re: Need Help Diagnosing Problem

    The two forward cats can be disconnected (just loosten bolts to allow leak) independently.

    My Jk has 4 cats...one broke (internally), contents blew back and clogged 2nd cat (what I suspect happened to yours)
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  12. #27
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    Re: Need Help Diagnosing Problem

    Carparts.com (link I posted above)
    $274

    Name:  repj960313_1.jpeg
Views: 55
Size:  7.4 KB
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  13. #28
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    Re: Need Help Diagnosing Problem

    Quote Originally Posted by OlneyJeeps View Post
    Carparts.com (link I posted above)
    $274

    Name:  repj960313_1.jpeg
Views: 55
Size:  7.4 KB
    Looks like a better price than the one I found on rock auto, thanks!

    Sent from my SM-G950U using Tapatalk

  14. #29
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    Re: Need Help Diagnosing Problem

    Have you tried loosening the connections at the manifold? Will give a little peace of mind before plunking down chunk of change and a lot of work it is to change those things
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

  15. #30
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    Re: Need Help Diagnosing Problem

    If the ceramic is not broken, it's actually quite easy to clean with either carburetor cleaner or even better is muriatic acid, but you have to remove the assembly to wash it through. Been there done that cost all of about $10 and a couple hours of Labor
    Quote Originally Posted by amber.hodge View Post
    Steve is so innocent. Its really cute, actually. Ah to be a kid again....
    "anyone who says they know everything about anything is either a fool or a liar"

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