Cat removal
Tuned
Joined: Oct 2013
Posts: 348
Likes: 2
From: British colombia
Ya the increase in performance is significant enough, there is a slight hesitation when excelleraing from idle bet it's VERY slight and doesn't do it all the time. The most significant change was the sound.
Senior User
Joined: May 2011
Posts: 339
Likes: 0
What if you can't ditch the smog pump. I'm deleting my cat, but plan to put on in 2 years from now when smog is due again. Can I just let the air injection tube hang out or does it need to be capped, or what do I do with it since I'm not removing the smog pump? The egr will go on the new headers, and the other air injection tube that goes on the headers is already on. SO I just need to figure out what to do with the tube that used to go on the cat.
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
What if you can't ditch the smog pump. I'm deleting my cat, but plan to put on in 2 years from now when smog is due again. Can I just let the air injection tube hang out or does it need to be capped, or what do I do with it since I'm not removing the smog pump? The egr will go on the new headers, and the other air injection tube that goes on the headers is already on. SO I just need to figure out what to do with the tube that used to go on the cat.
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Junior User
Joined: Oct 2013
Posts: 66
Likes: 0
Update. Removed cat, replaced front tank with new tank and sending unit and it runs fine albeit with a little backfiring. My gauge for the front tank isn't working still. I'm wondering what the next move is pertaining to the deleted cat. Do I need to adjust timing to stop the backfiring or will resetting the computer do it.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Backfiring? Actual backfiring where you get a nice blast of flame from the intake?
Or do you just hear cracklin and lots of pops from the exhaust now, especially on deceleration?
If it's just coming from the exhaust, it's normal to hear some popping unless the engine ain't running right. The cat normally muffles it some.
How is your exhaust set up now?
Or do you just hear cracklin and lots of pops from the exhaust now, especially on deceleration?
If it's just coming from the exhaust, it's normal to hear some popping unless the engine ain't running right. The cat normally muffles it some.
How is your exhaust set up now?
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Junior User
Joined: Oct 2013
Posts: 66
Likes: 0
The cat isn't there so it's just headers and I have to take it in to get the cat gutted and welded back in. I don't think straight pipe is going to do it in NC. I'm wondering if I should adjust the timing or if it's because the pipe was cut, also I replaced the front tank so bad gas was running through the engine. Once the gas from the brand new tank is run through the backfiring I hope isn't a problem anymore. The gauge for the front tank also isn't working.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,652
Likes: 79
From: Mooresville, NC
Once I removed the cat on my 460 89 ford f250 it runs but bogs down once I push the gas pedal. I need to gut the cat and drive it to a shop to have the cat welded back on. Is there something I need to do to make it run fairly smooth so I can get it to the shop? The two pipes on top of the cat that I cut out, do they need to be capped with something for it to run smoothly enough for me to get there?
Those two lines are the inlet and outlet from your air pump..........that plumbing does run through an Air Control Valve in the intake and its associated vacuum tubes and/or check valves may be causing the problem
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Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Taking out the cats on any year shouldn't cause trouble. 96+ you'll get the computer bitchin bout it but just pull the bulb and ignore the cat code whenever you scan it. Unless you're getting a tune as well, then just ask your programmer to disable the cat monitor.
Elder User
Joined: Mar 2014
Posts: 648
Likes: 0
From: St Charles Missouri
Dixie any comment on this statement? My buddy is asking me about removing his. I told him he could probably just let the tubes hang or take out the smog plumbing all together. I didn't think it would matter since he doesn't need exhaust testing and it's a 92
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