cat conv question - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > cat conv question

Jeep Wrangler Bushwacker Flat Fender Flare Sale at BaselinLedlight bar light locks @ oconee off road 706 534 9955Don't forget the Jeep Forum discount, 10% off!

Reply
Unread 08-11-2013, 06:11 PM   #1
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
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!

2tall2slow is offline   Reply With Quote
Unread 08-11-2013, 06:59 PM   #2
jabba974
Registered User
1996 ZJ 
 
Join Date: Mar 2013
Location: Ionia, MI
Posts: 246
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..
jabba974 is offline   Reply With Quote
Unread 08-11-2013, 07:04 PM   #3
JasonStebbins
Registered User
1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
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.
JasonStebbins is offline   Reply With Quote
Unread 08-12-2013, 05:08 AM   #4
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,436
having a partially clogged cat is not good for the engine. it causes heat and excess deposits to build up in the head.
ZeeJay1997 is offline   Reply With Quote
Unread 08-12-2013, 08:20 AM   #5
V65Ozzie
Registered User
1998 ZJ 
 
Join Date: Feb 2012
Location: Wilson, nc
Posts: 528
Give us the codes!!!
V65Ozzie is offline   Reply With Quote
Unread 08-12-2013, 11:20 AM   #6
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
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.
2tall2slow is offline   Reply With Quote
Unread 08-12-2013, 04:01 PM   #7
JasonStebbins
Registered User
1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
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.
JasonStebbins is offline   Reply With Quote
Unread 08-12-2013, 04:19 PM   #8
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
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.
2tall2slow is offline   Reply With Quote
Unread 08-12-2013, 04:23 PM   #9
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,436
take it out on the road and nail it. If it misses and bogs, you can bet the cat is stopped up
ZeeJay1997 is offline   Reply With Quote
Unread 08-12-2013, 04:37 PM   #10
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
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.
2tall2slow is offline   Reply With Quote
Unread 08-12-2013, 05:24 PM   #11
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,436
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.
ZeeJay1997 is offline   Reply With Quote
Unread 08-12-2013, 08:54 PM   #12
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
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.
2tall2slow is offline   Reply With Quote
Unread 08-12-2013, 08:57 PM   #13
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,436
Another though is that the cat may be hollow and not doing its job. The o2 sensor may not be lying to you
ZeeJay1997 is offline   Reply With Quote
Unread 08-12-2013, 09:16 PM   #14
2tall2slow
Registered User
1998 XJ Cherokee 
 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 120
How can i tell its hollow and its not performing? 209,900 miles..
2tall2slow is offline   Reply With Quote
Unread 08-13-2013, 05:11 AM   #15
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,436
there are some tests with a thermal heat gun... not sure how they are accomplished
ZeeJay1997 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.