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Unread 06-20-2008, 09:29 PM   #1
ANGIOMAN
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1993 YJ Wrangler 
 
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Runs rough!!

Howdy All, I have a problem with my Jeep running rough and I was hoping you guys/gals could help me trouble shoot it. My Jeep is a 1993 Renagade with the 6 cyl., 5-speed and 125,000 miles on the odometer. So, this morning I leave for work and the jeep starts and idles fine, but start to sputter above 1600 rpms. I replaced the fuel filter and added some fuel treatment hoping they would help, NOT. I have replaced the plugs, wires, rotor, and cap within the last six months and this is the first problem I have had. When the jeep is idling there is a lot of black watery discharge out the tail pipe and when I rev the motor above 1600 rpm the motor sputters and the exhaust spells like I lit a match?. also,I almost ran out of gas last week causing the fuel pump to wine,but after I filled up the wining stopped. Please help! I don't want to bring it in and pay hundreds of dollars that I don't have.

Thanks in advance.

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Unread 06-20-2008, 11:54 PM   #2
havasu
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Take a rubber mallet and give your catalytic converter a good bang. If your hear it rattling, then it is getting worn out and clogging up. It may be time to replace it.
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Unread 06-20-2008, 11:56 PM   #3
bunkrdfool
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^ Ditto ^
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Unread 06-21-2008, 12:16 AM   #4
Delta347
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If it is the cat. conv. you might have it easy for a fix! Don't they have a lifetime warranty? A fellow YJ owner once told me that his broke open and the factory replaced it for free since it has a Life Time Warranty.
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Side Effects may include dry mouth, nausea, vomitting, water retention, painful recolage, hallucination, dementia, psycosis, coma, death, and halitosus. YJs are not for everyone please consult your physician before use.
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Unread 06-21-2008, 10:15 AM   #5
havasu
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I wish a "lifetime warranty" was that easy. Most manufacturers do have extended warrantys for emission control devices, but if I am not mistaken, excludes cats and forbids off road usage. If you are the original owner or lucky to have all the warranty papers which were sold with the jeep, then it wouldn't hurt to read the fine print and challenge the dealer. If not, I would recommend to "suck it up" and pay the $70-$100 for the new one.

You might also ask for the old one to be returned to you and take it to a salvage yard. I hear they are giving $35 for some cats because of the valuable metals inside them.

Last thing, in So. Cal., thefts of cats are on the rise. It usually occurs to Toyota 4runners because the cats are big, the tall frame allows easy access while stealing them, and there are only a few bolts holding them on. Do yourself a favor, ask a welder to hit the bolts with a welder to stop from being stolen.
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Unread 06-21-2008, 11:26 AM   #6
ANGIOMAN
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I crawled under the jeep real quick this morning to rap the converter and found that it is completely protected by the skid plate. Yeah!
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Unread 06-21-2008, 11:38 AM   #7
tazzzdvil
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The sulfur smell always makes me think of the cat.

See that's why the older rusted jeeps are good.

Before starting my project, I could whack it from inside
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Unread 06-21-2008, 11:59 AM   #8
retroflow
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While it may be your Cat, I've had a very dead Catalytic Converter and you didn't mention anything that sounds like the usual symptoms - unmistakeable. However, a failing/dead O2 sensor will make your exhaust pipe sooty, as well as your spark plugs and the O2 sensor itself. Check 'em out. Oxygen sesnors don't last forever and your YJ will have outlived the original if you still have it on there, by what mileage you said here. At best, heated O2 sensors last maybe 100k if that, more often less.

Check around to your favorite auto supplies and then try on eBay. If you check on eBay, don't limit your search to Jeep only, try Dodge, Plymouth, etc. or search for the exact part numbers below..

According to my resources, you'll need the following part number/brand..

OS141 - BWD (Borg Warner)
SG121 - SMP (standard)
23023 - NTK (NGK)
213-1318 - AC Delco
15704 - Bosch
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Unread 06-21-2008, 02:36 PM   #9
Mean Max
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I agree with these guys, it has all the indications of a bad catalytic convertor. And, true enough, it will probably require replacement. There is one thing to keep in mind though, catalytic covertors don't "die", they're "murdered"! Try to find out the cause of the failure, or you'll face doing it again later on.

HTH
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Unread 06-21-2008, 03:39 PM   #10
NDJeep
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Quote:
Originally Posted by Delta347 View Post
If it is the cat. conv. you might have it easy for a fix! Don't they have a lifetime warranty? A fellow YJ owner once told me that his broke open and the factory replaced it for free since it has a Life Time Warranty.
Lifetime warrenty means for the life cycle of the product. If the company dosn't produce the model of the cat and has upgraded to a newer model than the life cycle of your product ends voiding your warrenty. Car parts dont go opsolete so much but never be fooled by the lifetime warrenty of a computer part. Those warrantys are only good for a year or so.
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Unread 06-27-2008, 10:35 AM   #11
ANGIOMAN
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turns out the rotor was broke. Runs like a top now!

Thanks for all of the ideas!
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Unread 06-27-2008, 02:37 PM   #12
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[QUOTE=havasujeeper;5363791]I wish a "lifetime warranty" was that easy. Most manufacturers do have extended warrantys for emission control devices, but if I am not mistaken, excludes cats and forbids off road usage. If you are the original owner or lucky to have all the warranty papers which were sold with the jeep, then it wouldn't hurt to read the fine print and challenge the dealer. If not, I would recommend to "suck it up" and pay the $70-$100 for the new one.
QUOTE]

I have to chime in on this. Emissions contolled vehicles have a 8 year 80K mileage warranty on emissions equipment. I got my cat. covered by jeep when my 1995 had 76K and was younger than 8 years. I believe federal law requires a manufacturer to cover the emissions equipment for 8 years regardless of factory warranty terms; eg. 3 year/36k warranty.
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Unread 09-06-2008, 11:09 PM   #13
jodylikeamelody
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My Jeep reeks!

Hi everyone, I'm new here. I just got my Jeep this spring. It only has 53,000 miles on it. I plan on doing a lot of modifications and such, but right now I am most concerned about the smell. The first couple of months it smelled liked burning hair, now it has gotten to rotten egg, with a black powder build up on the tailpipe. Any suggestions? I was thinking catalytic converter
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Unread 09-07-2008, 01:51 AM   #14
Brandon_YJ
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With a "rotten egg" smell you would be rightly so in thinking it is the cat.
There are a select few things that could cause a smell resembling that, but when you distinctly smell rotten eggs, it's 95% of the time a cat-conv issue.

BTW: For your profile, you more than likely have a 4.0L engine since you mention "straight 6". An NP231 transfer case, and Dana 30 / Dana 35 for your front and rear axles respectively.

Where in Michigan are you?
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Unread 09-07-2008, 10:05 AM   #15
Mazookie
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Hey, this reminds of something a guy told me. I was looking at his truck to buy it was a Chevy S10 ZR2, he was telling us about it and he said that the CAT was clogged so he just cut it out lol. Thats what you get livin in the country. Most guys at my high school just straight pipe there trucks. I know this doesn't help but hope you find out whats wrong.
~Mazooks~
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