Im getting code 43 in my 89 si with a b20b swap, Where should I start? The car runs really rich, has a slight hesitation at partial throttle... I unplugged the o2 sensor and the miss didnt go away...any ideas where to start? Thanks guys

 

Do you have an aftermarket fuel regulator? Those are notorious for causing code 43s if not setup properly.

Usually the o2 is the problem for code 43, but you need to change the O2. Running with the O2 unplugged will just make matters worse.
A bad O2 may not always throw a code and will make you run rich. The rich problem may cause misses/hesitations.

If you still get the code at this point, then it may also be a weak ignition system.... cap, rotor, wires, plugs, coil.

 

I just put on a new distributer , next m going to get a 02 sensor , my car has a 4 wire o2. What year car does the obd1 4 wire 02 sensor come from? Car has a stock fuel pressure regulator

 

Also it seems to throw the code more at night time when the air is cooler if that makes any sense

 

anyone?

 

need help guys

 

You get a new O2 yet?

 

I need to know what 02 sensor to get? All I know is the one I have is a obd1 4 wire o2 sensor. What is this o2 sensor from?

 

Not sure what ECU you have, but ff you are in any sort of doubt, you can get an O2 for the stock engine for your ECU.

But honestly any will work 4 wire Honda/Acura O2 will work. The connector may be a little different, but they all work the same.
Bosch make universal ones that you have to do simple wiring for - those have always worked fine for me.

 

I plan to go tommorow and get one, maybe I should just take my old one in with me. Im running a obd1 ls ecu , Would a obd1 integra o2 sensor be the same thing? I also went to honda and ordered a new fuel filter

 

I put a brand new oem honda fuel filter in today and it seemed to make a little difference but not fix the issue , Im going to get a new bosch 02 sensor today as well