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#4734026 - 04/21/18 10:32 AM Broken Cat
Stelth Offline


Registered: 02/24/11
Posts: 2037
Loc: California
I have a '94 Ram 2500 4x4 truck with a utility bed and pipe rack. Ever since I got it, I've felt like it didn't have enough power. I've never had a Dodge 360 before, but even at a rating of 230 horsepower in an 8800 GVWR truck, I thought it should have a little more juice. Just recently, it began getting worse. I had personally replaced the muffler and a lot of exhaust pipe, so I didn't think that was the problem. Then I began hearing a loud hissing and realized that it was coming from the cat. Pulled out the O2 sensor and stuck a coat hanger wire in there, and could feel things clunking around.

When I did the exhaust, I welded most of it, but up toward the front, I used a clamp where it would have been impossible to weld. Fortunately I was able to get it loose and pull the pipe right behind the cat off. I looked in with a flashlight and saw large chunks of the catalyst inside; for some reason it had broken into pieces. As I was driving, these pieces would move around, and I would get more or less restriction.

I was able to ram a metal stake into these chunks and break them up small enough to blow out by running the engine. Now I have the kind of power I expected, in fact, I have to watch my speed on the freeway, which was not a problem before. smile

I obviously have to replace the cat, any recommendations on a CARB-approved item? Magnaflow makes one, would that be good?
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#4734031 - 04/21/18 10:36 AM Re: Broken Cat [Re: Stelth]
dogememe Online   content


Registered: 04/15/17
Posts: 796
Loc: SF BAY AREA, CA
Yeah, the Magnaflow ones are fine, we sell them at my job, only problem we ever had was with [censored] quality welds on the direct-fit ones that are part of larger assemblies. Where in Cali are you?


Edited by Kestas (04/21/18 01:31 PM)
Edit Reason: No need to completely quote the first post in the second post
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#4734035 - 04/21/18 10:40 AM Re: Broken Cat [Re: Stelth]
BrocLuno Offline


Registered: 09/06/15
Posts: 5687
Loc: Kalifornia Kollective
So does this CAT have an external air feed (little tube coming in the front side)? If not, any universal fit CAT with the right dimensions will work fine. Weld it in if you can, as they get pretty hot and can work the pipe joints.

But, before I replaced an OEM CAT, I'd take it to a SMOG shop and see what it blows? Just get a "pre-test" and see what the numbers are? If they are good enough, I'd leave well enough alone. I have had two vehicles with gutted CAT's that pass smog fine smile

There is no need to spend money if not needed, and the truck runs well as is ...


Edited by BrocLuno (04/21/18 10:41 AM)
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4734052 - 04/21/18 10:56 AM Re: Broken Cat [Re: dogememe]
Stelth Offline


Registered: 02/24/11
Posts: 2037
Loc: California
Originally Posted By: dogememe
Yeah, the Magnaflow ones are fine, we sell them at my job, only problem we ever had was with [censored] quality welds on the direct-fit ones that are part of larger assemblies. Where in Cali are you?

San Diego area.

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#4734055 - 04/21/18 10:58 AM Re: Broken Cat [Re: BrocLuno]
Stelth Offline


Registered: 02/24/11
Posts: 2037
Loc: California
Originally Posted By: BrocLuno
So does this CAT have an external air feed (little tube coming in the front side)? If not, any universal fit CAT with the right dimensions will work fine. Weld it in if you can, as they get pretty hot and can work the pipe joints.

But, before I replaced an OEM CAT, I'd take it to a SMOG shop and see what it blows? Just get a "pre-test" and see what the numbers are? If they are good enough, I'd leave well enough alone. I have had two vehicles with gutted CAT's that pass smog fine smile

There is no need to spend money if not needed, and the truck runs well as is ...


Doesn't have any external air feed. Doesn't the replacement need a CARB approval number stamped on it?
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#4734060 - 04/21/18 11:03 AM Re: Broken Cat [Re: Stelth]
Chris142 Offline


Registered: 06/05/03
Posts: 17106
Loc: Deplorable in apple valley, ca
Originally Posted By: Stelth
Originally Posted By: BrocLuno
So does this CAT have an external air feed (little tube coming in the front side)? If not, any universal fit CAT with the right dimensions will work fine. Weld it in if you can, as they get pretty hot and can work the pipe joints.

But, before I replaced an OEM CAT, I'd take it to a SMOG shop and see what it blows? Just get a "pre-test" and see what the numbers are? If they are good enough, I'd leave well enough alone. I have had two vehicles with gutted CAT's that pass smog fine smile

There is no need to spend money if not needed, and the truck runs well as is ...


Doesn't have any external air feed. Doesn't the replacement need a CARB approval number stamped on it?
yes it does. And the smog guy will fail it if it has the wrong numbers or no numbers.
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#4734066 - 04/21/18 11:12 AM Re: Broken Cat [Re: Stelth]
BrocLuno Offline


Registered: 09/06/15
Posts: 5687
Loc: Kalifornia Kollective
Ah, but the gutted OEM is fine for visual inspection. So if it blows clean enough, you are good smile
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4734116 - 04/21/18 12:06 PM Re: Broken Cat [Re: Stelth]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6538
Loc: USA
The Magnaflow CARB cat will be fine smile

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#4734148 - 04/21/18 12:45 PM Re: Broken Cat [Re: Stelth]
dmoses42 Offline


Registered: 12/21/17
Posts: 19
Loc: GA
Oddly enough, I had a similar issue on a 1995 Dodge 1500 I bought new. At about 75,000 miles if I remember correctly, I was headed to work one morning and it acted like it ran out of gas. Let it sit for a couple of minutes and it would start and I could drive about 100 yards. Limped it back home that way, thinking I would have to buy a new fuel pump. At that time, OEM was all you could get, so I had it towed to the dealership to confirm my suspicions. Lo and behold, when I called for the confirmation, they told me that everything in the cat came loose and stopped up the muffler. They told me it was covered under the emissions warranty and replaced the entire exhaust system except for the tailpipe.

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#4734157 - 04/21/18 12:52 PM Re: Broken Cat [Re: Stelth]
benjy Offline


Registered: 08/23/10
Posts: 925
Loc: pa
magnablow stuff is quite pricey + since you can weld possibly a universal fit would work, but don't know about a carb #

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#4734195 - 04/21/18 01:28 PM Re: Broken Cat [Re: Stelth]
Nick1994 Offline


Registered: 02/19/13
Posts: 10442
Loc: Phoenix, AZ
My Jeep's catalytic converter broke too, but didn't impact power, just rattled a lot. I put a Magnaflow (non CARB) on it and it's fine.

But I think mine broke from off-roading, it was dented on the bottom whistle
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#4734203 - 04/21/18 01:38 PM Re: Broken Cat [Re: benjy]
Chris142 Offline


Registered: 06/05/03
Posts: 17106
Loc: Deplorable in apple valley, ca
Originally Posted By: benjy
magnablow stuff is quite pricey + since you can weld possibly a universal fit would work, but don't know about a carb #
a universal is a smog fail
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4734219 - 04/21/18 01:55 PM Re: Broken Cat [Re: BrocLuno]
JLTD Offline


Registered: 12/15/17
Posts: 929
Loc: US
Originally Posted By: BrocLuno
So does this CAT have an external air feed (little tube coming in the front side)? If not, any universal fit CAT with the right dimensions will work fine. Weld it in if you can, as they get pretty hot and can work the pipe joints.

But, before I replaced an OEM CAT, I'd take it to a SMOG shop and see what it blows? Just get a "pre-test" and see what the numbers are? If they are good enough, I'd leave well enough alone. I have had two vehicles with gutted CAT's that pass smog fine smile

There is no need to spend money if not needed, and the truck runs well as is ...


^this.

My brother had a Dodge V10, drilled out bith CATs and it passed emissions for years until he traded ...
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#4734252 - 04/21/18 02:18 PM Re: Broken Cat [Re: Stelth]
Trav Offline


Registered: 11/20/06
Posts: 19612
Loc: MA, Mittelfranken.de
No cat monitor, no CEL, cat in place with correct numbers I say give it a try as is. Get the thing good and hot with a good highway drive first.
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#4734288 - 04/21/18 02:38 PM Re: Broken Cat [Re: Stelth]
henni Offline


Registered: 12/28/11
Posts: 311
Loc: key largo,fl
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2014 Ridgeline RTL with Navi

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