Clearing out the pre-cats?
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Joined: Jul 1999
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From: KC, MO
Clearing out the pre-cats?
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My uncle, who is fimiliar with the cats on the F-150's, says I can unbolt the cats from my truck, and knock out the "honey comb" junk out of the pre-cats, and bolt them back up. I just wondered what your opinions were, and any other input. Has anyone done this? It is possible to do this way? How?
I want to do this because for the first 5000 mi., my rear O2 sensor harness was JAMMED on backwards and was running WAAAAY too rich. Constantly had CEL's and a bad O2. Stunk to high heaven. They finaly fixed it, and I wonder what it may have done to my cats / pre-cats, as I am running straight 3" pipe and it's still really quiet. My V6 with FM 40 was louder. I have an O2 sensor right before the pre-cats, and an O2 inside the middle of the cats. Would this effect the O2's? Couldn't I just clear out the very middle of the pre-cat rather than all of the stuff? It would be nice to get it louder and maybe pick up some performance.
Please check my setup, and tell me what you think. Thanks!!!
-AR
My uncle, who is fimiliar with the cats on the F-150's, says I can unbolt the cats from my truck, and knock out the "honey comb" junk out of the pre-cats, and bolt them back up. I just wondered what your opinions were, and any other input. Has anyone done this? It is possible to do this way? How?
I want to do this because for the first 5000 mi., my rear O2 sensor harness was JAMMED on backwards and was running WAAAAY too rich. Constantly had CEL's and a bad O2. Stunk to high heaven. They finaly fixed it, and I wonder what it may have done to my cats / pre-cats, as I am running straight 3" pipe and it's still really quiet. My V6 with FM 40 was louder. I have an O2 sensor right before the pre-cats, and an O2 inside the middle of the cats. Would this effect the O2's? Couldn't I just clear out the very middle of the pre-cat rather than all of the stuff? It would be nice to get it louder and maybe pick up some performance.
Please check my setup, and tell me what you think. Thanks!!!
-AR
Senior Member
Joined: Feb 2001
Posts: 641
Likes: 0
From: Calgary, Oilberta
You would have to add MIL eliminators to the sensors between the cats because the O2 sensors would detect that the front cats were not working and would set a code.
It is illegal and probably would not gain you much unless you had a blower or nitrous. Not worth it IMHO.
Ian
It is illegal and probably would not gain you much unless you had a blower or nitrous. Not worth it IMHO.
Ian
