catless problem!
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New User
Joined: Mar 2001
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catless problem!
I just cut the cats off my 95 F150 4x4 5.8L farm truck, no mufler, just straight pipe. Now my check engin light is on, the idel is fast and it shifts real hard. Is my o2 sensor bad? do I have to have some back pressure? Any help would be greatly appreciated.
Senior User
Joined: Feb 2001
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catless problem!
The check engine light is coming on because the computer is sensing that there isn't cats. I had a 98 mustang gt with an offroad h-pipe on (no-cat pipe) and the check engine light came on. It is common for that to happen. As far as the hard shifting, I am not sure? I had a 5-speed stick. Hope this helps. You might want to try to diconnect the battery, wait about 5 minutes, reconnect it and that should reset the computer for a little bit. That will allow you to see if the shifting is still hard. The check engine light will come on again around 30 miles or so, maybe more or less, but thats about when mine came back on.
Elder User
Joined: Dec 2000
Posts: 714
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From: Georgia
catless problem!
How can the computer tell if there are no cats?? I am planning to cut the cats off my '95 Bronco with a 5.8, but i am going to keep the muffler. The computer doesn't plug into the cats does it?
Postmaster
Joined: Feb 2000
Posts: 2,759
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From: Auburn,Al
catless problem!
maybe it senses the decrease in tempurature?
1985 F-150/351Ho/4wd/6inch with 33's
1979 f-250 429/4spd/6inchwith 36 inch buckshot mudders
on a quiet night your can hear a chevy (lol,you can watch a dodge) rusting away
1985 F-150/351Ho/4wd/6inch with 33's
1979 f-250 429/4spd/6inchwith 36 inch buckshot mudders
on a quiet night your can hear a chevy (lol,you can watch a dodge) rusting away
Senior User
Joined: Mar 2000
Posts: 425
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catless problem!
There is an o2 sensor in one of the cats, when you remove them just drill a hole in the exhaust pipe and put the o2 sensor into there, then the computer will still get its readings, this worked fine on my brothers 93 mustang 5.0 LX after installing a flowmaster off-road h-pipe with no cats and 40 series flowmaster mufflers
1995 F-150XL SC/SB
http://members.sounddomain.com/blind
5-Star Rated F-150 (Big Stereo)
1995 F-150XL SC/SB
http://members.sounddomain.com/blind
5-Star Rated F-150 (Big Stereo)
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