Header, Intake, & Exhaust - Check engine light??

I have a 93 civic cx and just put a 4-2-1 header on it and now my check enging light comes on after about 5 to 10 min.
I still have the stock oxygen sensor and catalytic converter on as well. There is also a cat back system already installed prior to the header. Any ideas on how to fix this problem??

its most likely something with the O2 sensor... give it a wiggle or unhook it and try hooking it up again.

So you figure its jsut a bad connection? I will give it a try thanx. I have had ppl tell me having the cat on will mess my oxygen sensor readings up, ever heard of that? I also have a cool air intake but that went on after, dunno if that would make a difference?

Disconnect the battery for a minute, then see if it still happens.

might be time to repace them anyway

not having the cat on might trip the light, but having one wont

you could also do what NTX said... but when they are disconnected touch the leads together (away from the battery of course) then reconnect to the battery and let the car idle for about 10-15 minutes. It will reset the computer in your car and force it to relearn everything it knows.

Hey I reset the comp and now it ran good for the 15 min idle time then I took a little ride and still fine. But when I was on my way out to my gf's it came on again?[sm=smiley5.gif]

sorry man... Im outta ideas now?

Have a local shop possibly check for error codes. Some places check it for free....i think.......

Ok thanx for the help anyways it was worth a try.

Hi Orange Civic...
If you have a AutoZone in your area you can go there and they will run a free sensor check for you and it may come up with some codes that they can decipher for you.

I doesnt cost anything and some of the stores guys do know whats going on and will be glad to help you out.

Hope this helps you!
WheelBroker:eek:

I dont think there is one here. You see I live Sault Ste Marie Ontario, Canada where well cars like mine are not so popular and there is not very much help out there. Pritty much all there help I have is my own research. But I am going to check with some other local shops and maybe the honda dealer.

I have the same problem and was wondering the same thing, also I wanted to know if it would still pass emissions. As far as I thought, it was pretty common for it to happen since the headers are free flowing and thinner metal compared to the stock manifold therefore creating higher temps and that will set off the O2 sensor. I've had a engine diagnostic done and it came back the O2 sensor. So I know what the problem is I just don't know how to fix it ie. different style O2 sensor, or reprogram ecu, etc...Well I'm sure there are quite a few people with headers, so if you have headers on and you didn't have a problem then what kind of headers are you runnin'? Any info would be great.