So i replaced my cats with some i bought from another member that had 15k on them. My stockers were rattling to hell and my truck was running like . I didnt realize how bad my truck was being choked until i replaced them. I actually had exhaust again..before all i heard was engine.

So on the 19th i had them welded in just as before and all was well. Truck ran strong again and my exhaust was back. Drove it for the weekend and then i heard this rattle yesterday. Sounded just like the original cats did when they first started goin bad. I would hear the rattle and it would go away after a while and come back. So i have to have something wrong. Where do i go with this? Could it be an o2? Severe rich condition? I plan to have a live tune locally pretty quick here. Just dont know if i should fix the cat again until i get the tune adjusted. Is it possible for a cat to go out that fast? Thanks guys...

Matt

 

A lean tune will do that.

 

sorry about the hijack...


applegarth...is that your last name? if so you related to anyone on oklahoma?

 

You can toast a cat in one pass down the track...I learned that the hard way. I no longer have to worry about them.

Dave

 

Lean or rich will kill a cat. Excessively lean will creat exhaust temps way to high and begine to melt the catalyst material. Being overly rich will clog them up with carbon depostis.

 

ooophphphph if it's a lean issue and killing cats you might want to figure it out quick.

 

Ya i was figuring it wasnt a good thing. I will be having justin take a look at it soon. Im just babying it to work for now. Ill post up when i figure out what the culprit is.

Which scenario would explain the shitty mileage? Like 10.. Normal is around 14 or so.

Thanks for the help...

Matt

 

If it's too rich wouldn't he be able to smell it? How rich would it have to be to smell?

 

Just a quick update.. Had fellow member justin log my tune. It did show a lean condition at heavy throttle. I will be forwarding the log to jesse to have adjusted. Thanks again justin!!

Matt

 

COT- Off?