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I have a custom header on my car right now and i am running on straight pipe.
I have a 2001 civic lx so the catalyic converter is where the header is, and i've replace 4-1 header in it and i couldn't plug the stock sensor back on because the header i had didn't come wif a hole on the top.
and the car idle's up and down when i am at the light
my question is if i put the plug and weld the o2 sensor in it will the problem be gone?thanks

 
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if it idle up and down, it sound like a vaccum leak somewhere. It their are like a hole somewhere else?

 
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Damn server bloop. Lost my whole post! Anyway it's because of the sensor.

http://dezod.com/pd_weld.cfm

^^Linky to bung

 
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first sensor measures air/fuel mixture... second sensor measures efficentcy of cat

 
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Exacto-mondo. We already spoke at great length about this.

So how's the car runnin now? I read your underwater epic saga.

 
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I am not sure if I am 100% correct, but so far from my experience, I strongly think that it's would have a lot of impact and you should put it back in

 
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cars running perfect as if nothing happened... went to the shop to test the pressure thing in each chamber or whatever that thing is called each culinder was putting out all the same.. i cant remeber the number.. think it was like 200 or something.. oils fine... changed it anywayz.. flushed radiator and power steering... smooth sailing