Bad cats, options?
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Senior User
Joined: Jan 2004
Posts: 427
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From: allen park
Bad cats, options?
So apparently, I have bad cats. My truck keeps throwing P0420. I'm not getting any issues with it running bad, lack of power or whatever. I'm thinking about cutting the cats out entirely (no inspections here), straight piping thru them, and replacing the muffler with a flowmaster to prevent the rumored muffler blowout from increased pressure getting to the muffler. Also installing/making mil eliminators.
What are your thoughts about this? Any foreseeable problems with this band-aid route?
What are your thoughts about this? Any foreseeable problems with this band-aid route?
Senior User
Joined: Dec 2005
Posts: 274
Likes: 0
Yes. You'll still continue to throw that code. If for whatever unforseen reason, you are forced to move into an emissions area, you'll be unable to register the truck, due to the removal of the eqipment - which is illegal by the way. I'd just pony up the bucks, and get it fixed right. You'll at least be comfortable that the job was done that way it should have been.
New User
Joined: Oct 2006
Posts: 10
Likes: 0
From: Mississippi
I would definitely replace them. Don't wait till they come apart and clog the muffler and spray sparks all over the road. I just replaced both cats on my 99' f150/5.4 and a flowmaster muffler for around $500. They weren't ford cats, but they work great. The truck runs better and sounds great. Getting rid of the cats is definitely not the answer, I've seen too many problems arise from that.
Postmaster
Joined: May 2003
Posts: 3,310
Likes: 9
From: E.Lincoln County, NC
Originally Posted by wolfman01
Yes. You'll still continue to throw that code.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
These codes by themselves in no way indicate that the converters are going to either clog or disintegrate.
Just add the MIL eliminators to your downstream O2 sensor on that side and keep an eye out for the proper symptoms of catalyst clogging or crumbling.
Steve
Just add the MIL eliminators to your downstream O2 sensor on that side and keep an eye out for the proper symptoms of catalyst clogging or crumbling.
Steve
I cant wait to gut mine (no emissions testing here). Then, my Super 40 should sound much, much better
