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HOT 340
Dodge Dakota
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8/23/2008
10:22:32
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 Subject: Cats rattling...what to do?
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Message:
Well, Ive read alot of post on removing cats and such and still not sure what to do with my tow rig. It's an 01 dakota with a 4.7 five speed and the cats are ratting on deceleration. Ive taken the heat sheilds off so thats what I figure it has to be. It has the two precats with the 02 sensors AFTER them, then a third cat with a sensor after it also. How can I do away with, or gut the cats without giving off a code? Will the 02 sims work on all 3 sensor connections without throwing a code? Ive even read to take the third and just wrap it in tin foil and hang it up somewhere on the frame....not looking for mods or sound improvment (thats what the race car is for), just want to get the rattling out from under the truck....Thanks for your help....
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Forseti
Dodge Dakota
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8/23/2008
11:45:14
| RE: Cats rattling...what to do?
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Message:
How many miles do you have ... the cats are covered under the 8 year 80K mile
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HOT 340
Dodge Dakota
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8/23/2008
13:27:35
| RE: Cats rattling...what to do?
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92,000 miles.....
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HOT 340
Dodge Dakota
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8/23/2008
14:09:48
| RE: Cats rattling...what to do?
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Message:
Well, I just went out and looked, it actually has 02 sensors before and after both pre-cats, but none after the third....
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RamCharger
Dodge Dakota
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8/23/2008
22:27:16
| RE: Cats rattling...what to do?
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Message:
Either get a new cat or
hang a bag of catnip near the tailpipe tonight and hope for the best.
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Benny
Dodge Dakota
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8/23/2008
22:53:19
| RE: Cats rattling...what to do?
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Message:
Those are NOT what you called "pre-cats". Those are the main cats. What you call the third cat is there to scavenge what the two main cats cannot process.
The O2 sensors before the cats are part of the fuel mixture/emissions feedback loop, and cannot be simulated.
The O2 sensors after the cats are there mostly to monitor cat efficiency, and can be simulated easily.
If you gut those cats, you will need a simulator, or those downstream O2 sensors will cause at least two codes and the dreaded Check Engine Light.
Do the right thing, and have those cats replaced.
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HOT 340
Dodge Dakota
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8/24/2008
08:30:29
| RE: Cats rattling...what to do?
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Message:
Thanks for the info Benny..now how would you go about replacing those cats? Surely the dealership will want 5 to 7 times more for new cats than what they are worth, so that is hardly an option.
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easy
Dodge Dakota
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8/24/2008
11:05:19
| RE: Cats rattling...what to do?
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Message:
get the pipe diameter size
then check local parts stores and/or ebay
replacement or high flow cats
then if you have the tools and know how replace them yourself or have a local muffler shop do it
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HOT 340
Dodge Dakota
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8/24/2008
11:33:27
| RE: Cats rattling...what to do?
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Message:
Thats a tight fit up in there and not much room for lenght either, so any old cat isnt gonna fit. And if I move them back by the trans the wiring for the sensors are gonna need hacked and lenghthed.
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ya well
Dodge Dakota
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8/24/2008
13:36:49
| RE: Cats rattling...what to do?
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Message:
Based on that response, Your best bet is to take it to a shop.
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hey yeah
Dodge Dakota
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8/24/2008
14:34:17
| RE: Cats rattling...what to do?
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Message:
You have to take a 4 year course before you can change a CatCon
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not really
Dodge Dakota
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8/24/2008
14:46:58
|  RE: Cats rattling...what to do?
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But a defeatist attitude won't get the job done.
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HOT 340
Dodge Dakota
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8/24/2008
15:12:06
| RE: Cats rattling...what to do?
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Message:
Thanks all, I guess I'll just take it to the shop as suggested, just thought there might be a cheaper bolt on way...
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Paco
Dodge Dakota
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8/27/2008
22:15:53
| RE: Cats rattling...what to do?
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Message:
I had the same problem 2 yrs ago. Went to Lou's Custom Exhaust in Worcester, MA. and he (Jon) could not custom fit anything. He said the shortest Cat he had was 9", but the stock 2 to 1 tube, had a slight bend where the cats are located. He got the new part from the dealer at about $500. The same dealer quoted me $750. Apparently, this is a know problem so they may deal if you raise a big stink. And by the way, it took several visits to the dealer and a few other mechanics for them to admit to what I already knew about the cats. I mourn the wasted heat shield that was taken from me.
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N56629
GenIII
8/30/2008
22:00:04
| RE: Cats rattling...what to do?
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Message:
One, check and make sure Dodge doesn't have a recall on them. I had mine replaced for free just last year. It's a '99.
There are several after market performance cats available. You can find universal ones that come in just about every inlet and outlet configuration imaginable. Magnaflo and Dynamax are just a couple that come to mind. They all require cutting the existing pipe and fitting them in between.
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Hey
Dodge Dakota
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8/31/2008
09:46:05
| RE: Cats rattling...what to do?
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Message:
ThunderBolt is another choice and you can find some good deals on Ebay.
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