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post #1 of 16 Old 08-11-2013, 06:11 PM Thread Starter
2tall2slow
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1998 XJ Cherokee 
 
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cat conv question

Just when i got use to my cel being off, its back on. Had it scanned and was told cat conv reperforming under par. rather than spend out more money, $135 for new one, i was told to try some feul injector cleaner, and some stuff called sea foam engine cleaner. Reminder, i am no mechanic, but could it be that i am getting some bad gas? I mean, if its saying its performing under par, doesnt that ultimately mean that i'll just be getting bad gas milage? its not like its gonna leave me stranded on the side of the road either, right? Advice welcomed and greatly appreciated!

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post #2 of 16 Old 08-11-2013, 06:59 PM
jabba974
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Try the Seafoam, or some 3m fueal system cleaner...and then take it out and put the wood to it..The cat might be plugging up...time to get the carbon out..
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post #3 of 16 Old 08-11-2013, 07:04 PM
JasonStebbins
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If it gets too clogged you're Jeep will not run. My Magnaflow costed me $65.00 shipped on eBay and I had a bung welded on for the sensor.

What is the code? It could be the sensor is bad and not the converter.

Poop
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post #4 of 16 Old 08-12-2013, 05:08 AM
ZeeJay1997
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having a partially clogged cat is not good for the engine. it causes heat and excess deposits to build up in the head.
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post #5 of 16 Old 08-12-2013, 08:20 AM
V65Ozzie
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Give us the codes!!!
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post #6 of 16 Old 08-12-2013, 11:20 AM Thread Starter
2tall2slow
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Unfortunately i didnt get the code, had the oreilly guy scan it. When he said cat conv running efficiency low, i came home and found in my haynes book 2possible codes. He also said o2 sensor could be gone bad causing that code to show. I replaced o2 sensor closest to rear manifold few weeks ago, but neglected to change thw one near the rear.
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post #7 of 16 Old 08-12-2013, 04:01 PM
JasonStebbins
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Does it have any running issues? The first time it was my converter, but the honeycomb collapsed inside so it was obvious. The second time the sensor went bad and was reading voltage too high.

Mopar or NTK/NGK only.

Poop
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post #8 of 16 Old 08-12-2013, 04:19 PM Thread Starter
2tall2slow
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No issue other than cel is on. Runs strong. Makes sense that it could be o2 censor, being that its connwcted directly to cat conv. And its prob never been changed.
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post #9 of 16 Old 08-12-2013, 04:23 PM
ZeeJay1997
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take it out on the road and nail it. If it misses and bogs, you can bet the cat is stopped up
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post #10 of 16 Old 08-12-2013, 04:37 PM Thread Starter
2tall2slow
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I rarely go over 55. I take it easy on my jeeps, but after i am done fishing, i will run it up going home. If it drives, no bogging, whats tht tell me? I plan on a beach trip this weekend and dony want the family stranded.
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post #11 of 16 Old 08-12-2013, 05:24 PM
ZeeJay1997
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My first indication my cat was plugged was when i dropped out to pass on a two lane road and could not get over 3K rpms when it kicked down. Luckily I was able to duck back in. Then it got to where it wouldnt climb a hill without losing speed. If I stayed on it, valves rattled, misfired, and heat climbed. What happened wass the pressure that is supposed to go out the tail pipe was backing up through the valves into the intake, causing low vacuum. A true phenomenon.

All the rear sensor does is monitor the cat. If it is sending slightly incorrect correct signal, the PCM throws the cat code. It is entirely possible that it is lazy and not throwing a code specific to the sensor. If you get a sensor, get an NTK.
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post #12 of 16 Old 08-12-2013, 08:54 PM Thread Starter
2tall2slow
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Leaning towards a sensor. Its my cheapest, easiest bet i believe. Dont think the cat is clogging, cause i am not misfiring orbogging and theres no lost power. Gave her some injector cleaner today and plan on replacing sensor this week.
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post #13 of 16 Old 08-12-2013, 08:57 PM
ZeeJay1997
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Another though is that the cat may be hollow and not doing its job. The o2 sensor may not be lying to you
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post #14 of 16 Old 08-12-2013, 09:16 PM Thread Starter
2tall2slow
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How can i tell its hollow and its not performing? 209,900 miles..
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post #15 of 16 Old 08-13-2013, 05:11 AM
ZeeJay1997
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there are some tests with a thermal heat gun... not sure how they are accomplished
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