Loose the o2
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Senior User
Joined: Oct 2001
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Loose the o2
I have a 93 4.9 and want to pull my restricted CAT and replace with a pipe (no emission testing here). Can I get rid of the o2 sensor, or should I? I have heard that with OBDI loosing the o2 wont adversly effect anything. If the CAT is gone and the o2 left on, will this cause a problem? If I should toss the o2 are there any special requirements to deal with the left over wire? Thanks!
More Turbo
Joined: May 2000
Posts: 655
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Loose the o2
Well you will be making it obvious if you replace the CAT with a test pipe. Just rod out the cat and leave it in place and leave the O2 sensor connected. If you do want to disconnect the sensor just clip the wire and tape it off.
Bob
Bob
Senior User
Joined: Oct 2001
Posts: 358
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From: Washington
Loose the o2
DON'T remove your O2 sensor unless you want your truck to run like trash. The computer requires the O2 sensor to adjust injector pulse width to vary the fuel ratio to make your engine run correctly. You can remove the CAT with no adverse effects all the cat does is reburn exhaust gases to make them cleaner.
Later,
Dave
79' F250 351M
78' F150 300six
78' F150 300 EFI six
Later,
Dave
79' F250 351M
78' F150 300six
78' F150 300 EFI six
Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Loose the o2
But the O2 sensor uses the gases that shoot out after the cat. w/o the cat, the gases will not have the same chemical properties, thus altering what the o2 sensor reads...thereby scewing with the computer.
If this is not correct, please let me know...because I want to do exactly the same exact thing.
NJK
If this is not correct, please let me know...because I want to do exactly the same exact thing.
NJK
Senior User
Joined: Jul 2001
Posts: 470
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Loose the o2
The 93's O2 should be before the converter anyway, so anything downstream won't affect its reading (well, reducing backpressure would change it slightly, but not to any effect). Leave the O2 in. O2's are good things, they just need to be hooked to a computer that says 'mo powa' instead of 'must....be.....slower......than.....302.....'
-=Whittey=-
-=Whittey=-
Posting Guru
Joined: Jun 2001
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From: Conyers
Loose the o2
I found a mail-order magazine that has a o2 sensor replacement, it just plugs into the harness and replaces the O2. I think it then fools the comp into thinking the O2 is still there. I'll look it up tonight and if I find it I'll post.
Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Loose the o2
goto www.google.com and type in "mil eliminator" you'll find a set of o2 foolers for $30/pair.
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Senior User
Joined: Oct 2001
Posts: 358
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From: Washington
Loose the o2
OK guys, I have a 1978 F150 that I transplanted an EFI motor into. Currently I am running directly off the exhaust manifolds to a fabbed up h-pipe with the O2 sensor in the cross of the H. Then the exhaust exits through the muffler. If you want to remove the cat there will be no adverse affects accept if you have to be emmision tested you won't pass. But you MUST leave the O2 sensor in, all you have to do is go to a place that sells performance parts and have them order you a weld in O2 bung and put that into you pipe or what ever near where the old sensor was removed it is really not that difficult. Your engine will run just as it did b4 and you won't loose your computer management. When you remove the O2 sensor the computer gose into closed loop operation which means it doesn't adjust your engine for greatest efficiency. Anyways I hope this helps if not let me know. I will try again.
Later,
Dave
79' F250 351M
78' F150 300six
78' F150 300 EFI six, with an O2 sensor and no cat
Later,
Dave
79' F250 351M
78' F150 300six
78' F150 300 EFI six, with an O2 sensor and no cat
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Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Loose the o2
I still retain that there are some of us out here that have o2 sensors behind the cat. In this case, a MIL eliminator must be used. For those that have sensors before the cat, then yes, just leave it in the pipe, if possible.
Correct?
Correct?
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