Loosing motor power, exhaust blockage? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-07-2010, 10:26 PM   #1
Jeeper
 
Join Date: Jun 2010
Location: Louisville
Posts: 31
Loosing motor power, exhaust blockage?

Ok, so I'm driving home from work this morning and stop at a red light. Up until then, things were going ok. I start going when the light turns green and realize that the motor is hardly putting out any power, I'm damn near flooring the thing without hardly any acceleration. I listen for a knock in the motor, don't hear it, and then realize that the entire sound of the motor is dulled (at least the sound coming from the exhaust). I end up pulling over, turning her off, and checking everything over... all looks good.
I start it up again and everything's fine! Sounds fine... I drive it home without any problems and at full power and acceleration.

Now, a bit of background info...
For the last couple of weeks there's been a god awful rattling in the exhaust near the catalitic converter. I got under there a couple of times, banged on things, rattled stuff around, applied pressure at different points, etc... and the rattling sound was still there (sounding like debris of some kind in the converter). I've planned on cutting it off and running a straight pipe to bridge the gap but haven't gotten around to it.

The question is... could the loss of power simply be due to debris in the catalitic converter blocking the exhaust? Or could it be something more worrisome?

Thanks!

leeejone is offline   Quote Quick Reply
Old 08-07-2010, 10:39 PM   #2
Jeeper
 
Kohrs93's Avatar
 
Join Date: Apr 2010
Location: Moline, IL
Posts: 594
You probably need to either replace the cat or get rid of it. Sounds to me like that one is going bad. I had the same issue right when i got mine.

__________________
92 2.5L 5 speed - 3" RC lift - Skyjacker Steering Stabilizer - 17" XD HOSS wheels - 315/70r17 BFG All-terrain T/A
Kohrs93 is offline   Quote Quick Reply
Old 08-07-2010, 10:44 PM   #3
Jeeper

WF Supporting Member
 
jeepjones's Avatar
 
Join Date: Jul 2010
Location: Canada, Eh?
Posts: 1,892
It's the ceramic honeycomb in the Cat, it has broken free or a piece of it has. It is blocking your exhaust. So basically your cat needs to be replaced.It is possible that the chunk of ceramic will eventually get lodge in the pipe leaving you stranded.
jeepjones is offline   Quote Quick Reply
Old 08-07-2010, 10:52 PM   #4
Jeeper
 
Join Date: Jan 2008
Location: Nowhere
Posts: 213
Could be your cat, Could be an electrical problem. It could be allot of things.

The loss of power certainly could be from a clogged cat... Though I don't believe that is usually something that shows up all at once. It would build over time.

I would check my plug wires and maybe my fuel pressure.

There are allot of things it could be. I'm just kind of stabbing in the dark here.

Good luck.
__________________
Government and Religon are failed attempts to control the uncontrollable.
King of Beers is offline   Quote Quick Reply
Old 08-07-2010, 11:44 PM   #5
Jeeper
 
FNjeep's Avatar
 
Join Date: Jul 2010
Location: Everett, WA
Posts: 266
I'd check your air filter, for the simple solution and the vacuum tubes coming out from the box.

However, it does sound like a Catalytic converter problem from what you're describing. You'll need to replace the Catalytic converter to keep your Jeep "Street Legal" in most States emissions tests.
FNjeep is offline   Quote Quick Reply
Old 08-08-2010, 12:34 AM   #6
Jeeper
 
Join Date: Jun 2010
Location: Louisville
Posts: 31
Quote:
Originally Posted by King of Beers View Post
Could be your cat, Could be an electrical problem. It could be allot of things.

The loss of power certainly could be from a clogged cat... Though I don't believe that is usually something that shows up all at once. It would build over time.

I would check my plug wires and maybe my fuel pressure.

There are allot of things it could be. I'm just kind of stabbing in the dark here.

Good luck.
I'll check out the plug wires (need to replace the plugs anyway) and fuel pressure, see how that's doing.

As to the catalytic converter issues building up over time... could the rattling that has been going on down there for the last couple of weeks have been the beginning of that? I've somehow never run into exhaust issues with any of the POS's that I've had, so I'm not sure about these things other than word of mouth.

Quote:
Originally Posted by FNjeep View Post
I'd check your air filter, for the simple solution and the vacuum tubes coming out from the box.

However, it does sound like a Catalytic converter problem from what you're describing. You'll need to replace the Catalytic converter to keep your Jeep "Street Legal" in most States emissions tests.
I put a new filter into it when I got it a few months back, and the hoses are all clear (they even look new, maybe from the PO who seemed to keep it immaculate).
Thankfully, the Catalytic Converter isn't an issue in Kentucky, where they did away with emissions testing a few years back.
leeejone is offline   Quote Quick Reply
Old 08-13-2010, 02:10 PM   #7
Jeeper
 
Join Date: Jan 2008
Location: Nowhere
Posts: 213
Any resolution?
__________________
Government and Religon are failed attempts to control the uncontrollable.
King of Beers is offline   Quote Quick Reply
Old 08-13-2010, 09:45 PM   #8
Jeeper
 
FNjeep's Avatar
 
Join Date: Jul 2010
Location: Everett, WA
Posts: 266
Then get to a Muffler Shop, or even better a "One Man" shop muffler guy to cut out the Cat and run some straight pipe to your exhaust.

This is a $75 or less job. (don't let them try to sell you a new muffler!)

A cut and weld like this takes about 15 minutes.
FNjeep is offline   Quote Quick Reply
Old 08-15-2010, 10:26 AM   #9
Jeeper
 
Join Date: Aug 2009
Location: waco
Posts: 29
I have a 93 YJ with 4.0 and basically the same thing happened to me. Loss of power coming home from work. Checked air filter and changed fuel filter. No improvement. Catalytic converter making same rattle! It is only clamped in place, and looks easy to remove and inspect. Plan on doing this monday. Will post results!!
mbusby is offline   Quote Quick Reply
Old 08-16-2010, 02:21 PM   #10
Jeeper
 
Join Date: Aug 2009
Location: waco
Posts: 29
Catalytic converter not as easy to get off as it looked! was broken inside. replaced with aftermarket cat for less than $200. Anything older than 1983 is required to have cat in texas. No inspection sticker if its not there. Jeep ran like it should after replacement.
mbusby is offline   Quote Quick Reply
Old 11-11-2010, 06:35 PM   #11
Newb
 
Join Date: Nov 2010
Posts: 1
catalitic converter blocking

The question is... could the loss of power simply be due to debris in the catalitic converter blocking the exhaust? Or could it be something more worrisome?

Yes same thing happed to me last week and had the jeep towed to the dealer, they said that the cat was broken and plugging the exhaust witch was a big problem no power at all. 2008 wrangler has an 80000 mile warrenty that covers the cat to be replaced..
JanlWranglerX is offline   Quote Quick Reply
Old 11-11-2010, 09:05 PM   #12
Jeeper
 
wasomma's Avatar
 
Join Date: Aug 2010
Location: Baltimore, MD
Posts: 925
Dude check this out, I had this thing stuck in my exhaust pipe and had to install a new cat back system (replace the muffler and cat)



had exactly the same symptoms you had, my recommendation is to stop driving it and fix the issue because you may blow some debris back into your muffler and scrap it.

P.S. that was part of the cat, and I had the same rattling etc. for a while until it finally blew through and I couldnt go faster than 40mph

__________________
http://i.imgur.com/hboF5oU.jpg
wasomma is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Leaky Exhaust manifold AKWrangler TJ Tech Forum 1 03-29-2010 10:20 AM
Exhaust Manifold Question jamesdeanblvd TJ Tech Forum 7 07-26-2009 10:57 PM
Exhaust Question my1stjeep YJ General Discussion Forum 12 07-02-2009 07:14 PM
New JBA Exhaust installed with video! ldouble619 TJ General Discussion Forum 5 12-03-2008 11:42 AM
Exhaust Tip delima Blide YJ General Discussion Forum 10 10-28-2006 04:33 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 10:43 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC