Have a problem after installing headers and a custom exhaust
 

Hi I need help about a week ago I installed headers and a custom dual exhaust on my 94 accord, but as soon as I drove it I noticed something was wrong I was at a stop light and noticed that my car was reving itself up to 2000 rpm's and down to 400 rpm's. I was told that maybe the header o2 sensor doesn't work, but not sure. Does anybody know what might be the problem?

RE: Have a problem after installing headers and a custom exhaust
 

What headers are they? Did you use the stock o2 sensor or get a new one? Is the cat still on there? Try resetting your ecu to let the computer learn everything. Unplug the battery and open your doors to use the rest of thepower for about 20 minutes. Hook the battery back up, start it, let it idle for a few minutes w/o touching the gas and then drive it normally. That may help. Let us know.

RE: Have a problem after installing headers and a custom exhaust
 

use a spark plug fouler...drill a hole in the fouler big enough for the sensor can slide in..this will trick the sensor. do a search on google for anti-fouler tricks

RE: Have a problem after installing headers and a custom exhaust
 

Agree with 19Accord97. After every mod you should do this.
Not sure about a fouler, never heard of it. Maybe someone can enlighten me...

RE: Have a problem after installing headers and a custom exhaust
 

the headers are Megan 4-2-1 and its the original o2 sensor and no their is no cat, but it has a megan resonator. I already tried disconecting the battery and left it for about 30 minutes and it still does it, but it doesn't go up to 2000 rpm's now it goes up to 1300 rpm's and down to 400 rpm's. Could it be the o2 sensor or the resonator. And the exhaust fumes stink really bad.[X(]

RE: Have a problem after installing headers and a custom exhaust
 

no cat = a incorrect O2 reading on ur sensor... 2 options get a cat or get a resistor... that will imulate the reading of the exhaust after the cat... stink how? gassy? lean? theres no way for exhaust to actualy STINK but it can smell oily or whatever

RE: Have a problem after installing headers and a custom exhaust
 

please put the cat back on the car so breathing for the rest of us is easier.........

ICV or vaccum leak are most common reasons for looping idle. double check your work

RE: Have a problem after installing headers and a custom exhaust
 

to reset the computer in the future you can also remove the main 7.5amp fuse for about 20-30 seconds... Also, did you re-install the second O2 sensor that normally goes behind the cat?

RE: Have a problem after installing headers and a custom exhaust
 

How do I put the resistor? and it has a gassy smell.

RE: Have a problem after installing headers and a custom exhaust
 

if it's gassy then you are running rich, sounds like you're lacking that rear O2 sensor, search for O2 sensor emulator and you may be able to find a sensor that will emulate the readings it's supposed to give... Did your check engine light come on by chance? I would assume that if it hasn't already it's going to

RE: Have a problem after installing headers and a custom exhaust
 

I don't know much but what is a O2 sensor emulator and no the check engine light hasn't turned on. I forgot to mention that when I got my car back after installing the headers and the exhaust the O2 sensor was not plugged in and the car was running good then i found out that the O2 sensor was not plugged in so I plugged it in and that's when I noticed my car going up to 2000 rpm's.

RE: Have a problem after installing headers and a custom exhaust
 

it may have fouled your O2 sensor, make sure that BOTH of them are plugged in, an emulator just sends the ECU a signal that tells it that the air/fuel mixture is fine without having it take a real reading

RE: Have a problem after installing headers and a custom exhaust
 

Where can I buy the emulator? Its it expensive? and should I buy the O2 sensor?

RE: Have a problem after installing headers and a custom exhaust
 

Here's an idea of the O2 simulator.... you also need to make sure that when you first turn on/start your car that the check engine light comes on for a second (indicating that the bulb isn't burned out), Look around for vacuum leaks and if you haven't reset the computer since you re-connected your 02 sensor then do that as well

http://cgi.ebay.com/ebaymotors/MIL-e...QQcmdZViewItem

RE: Have a problem after installing headers and a custom exhaust
 

Agreed. Try everything suggested BEFORE buying an o2 sensor. When I had my cat and headers put on I had to get a new one for the headers (so the one for the cat may be more) and it cost me $145!!! It was from CarQuest and was Bosch. I can only imagine what oem ones cost.

RE: Have a problem after installing headers and a custom exhaust
 

Yo man i got the same thing happening on my car. Check the throttle position sensor, mine was doin it and i disconnect my tps and it goes back to normal. then i plug it back in and it does it again, i got a bad tps and i kinda think your car has a bad tps, mine revs up to 2200 sometimes anfter it warms up, at stoplights it reve up 1700 or 1800 and down to 800 or 700 and im pretty sure it the tps. i've got a 90 accord with 96 sohc vtec f22b1 engine with no map sensor lol and it work hella fine.

RE: Have a problem after installing headers and a custom exhaust
 

I thought this was a 94 accord? 94 and 95 accord were obd1 and only have the one o2 sensor before the catalyst. There is no 2nd o2 sensor on those models. Sounds like a vacuume leak to me or possibly iac valve sticking.

RE: Have a problem after installing headers and a custom exhaust
 

Hey night rider you were right I changed the tps and dont have any problems again. Thanks