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Unread 01-14-2014, 04:02 PM   #1
zjforlife
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1998 ZJ 
 
Join Date: Dec 2012
Location: Tampa, Florida
Posts: 325
Bogging down/low rps in reverse

First issue I've been having with my ZJ is about 4-5 months ago I welded a glasspack on my exhaust and ever since then it's been bogging down really bad when I giving it full throttle and quickly release the gas it goes from about 2200 rpm to 800 quickly fluttering and barley staying high enough not to die Bad cat? Idk any help would be appreciated
The second issue I'm having is when I put her in reverse idles at 500 rpm almost completely fluttering out it also wobbles from the rear passenger side it stays just high enough in the rpms not to die thanks for any advice guys

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Unread 01-14-2014, 04:16 PM   #2
dusterdude
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1996 ZJ 
 
Join Date: Jan 2012
Location: hopewell, va
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Some mufflers are directional,check yours and see if it is installed correctly
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Unread 01-14-2014, 04:20 PM   #3
zjforlife
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1998 ZJ 
 
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Location: Tampa, Florida
Posts: 325
This glasspack was a straight tube it didn't have any arrows on it or inflow outflow sides good advice tho any other ideas?
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Unread 01-14-2014, 05:52 PM   #4
JasonStebbins
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1997 ZJ 
 
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Sounds like a back pressure issue regarding the exhaust. Could be a clogged converter.

Have you checked the transmission fluid level while running warm in neutral?
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Unread 01-14-2014, 06:05 PM   #5
zjforlife
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1998 ZJ 
 
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If the cat is blocked could would it be easier and more cost efficient jus to replace and I dropped the pan a few months back and the fluid all still pink for the most part
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Unread 01-14-2014, 06:42 PM   #6
JasonStebbins
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1997 ZJ 
 
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If it is the converter, they aren't that expensive. Might as well get a high-flow model if you go that route. Is yours original? Could be something else causing the issue, but it sounds like a back pressure/exhaust problem if you let off and it almost stalls out.

Have you checked the dipstick level though? Mine was doing something similar when I had a pin hole leak and the fluid got a little too low.
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Unread 01-14-2014, 06:53 PM   #7
zjforlife
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1998 ZJ 
 
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Location: Tampa, Florida
Posts: 325
I'll check again tomorrow all of the fluids and I hope it's just the cat could it possibly be a air filter?
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Unread 01-14-2014, 07:05 PM   #8
JasonStebbins
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Highly doubtful unless it's the original from 1998.

I'm not positive it's the converter, that's just my suggestion from your symptoms. Does it drive fine the rest of the time? What happens when you floor it from a dead stop, any restrictions or bogging down? Experiencing any other problems besides when you let off the gas?
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Unread 01-14-2014, 07:13 PM   #9
zjforlife
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1998 ZJ 
 
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When I floor it just spins the wheels and doesn't shift until about 2200 but I thought that would be a Trans problem and it the original haha
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Unread 01-14-2014, 09:27 PM   #10
zjforlife
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1998 ZJ 
 
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Location: Tampa, Florida
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When I drove home tonight from work the ZJ did ok no bogging down but I believe this is because of the low temp after a few runs the ZJ did it again I think temp might be affecting the bogging down ideas?!
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