Ok so i have a 91 crx with an obd0 b16 swap. My problem is that every time i try to keep at a steady speed it feels like its loading up. If i give it more gas it works fine. I pulled the plugs and re checked ignition timing. I checked the IACV and the fast idle. Everything tests fine. The only code I ever get is an intermitant 02 code, i think its cause i tied the O2s together. I had them tied together in my integra and it worked fine so i dont think thats the issue.

Any ideas guys?

 

Mine is doing something similar, only it hesitates at a fixed throttle, many think it may be the throttle position sensor causing my issue....

Kirk R

 

You should never tie both of the O2's together. Running both O2 sensors will make the car run smoother.

 

The issue is most likely with your o2 sensors, the obd0 b16s run 2 o2 sensors but the if you are using a pr3 like I was it's not wired up. So you either have to disable the secondary o2 or get the b16 manifold that has the 2 o2 sensor bungs in the header and wire both up. However you can not wire them together it will still cause the same issue, you must wire them separate.

(AccordVT's friend)

-Amp

 

see pics:
https://honda-tech.com/forums/showth...=404493&page=2


Wiring the o2 sensors correctly
is like the difference between night and day..

My car got 35.6 mpg just this weekend and still runs
like a bat outta hell..

 

Many people with B16A swaps have this problem and 99% of the time the answer is as follows:

Your O2 sensors are wired up backwards (or in this case, together).

The reason they get mixed up is because:

- the stock harness from your car only has a single O2 sensor plug.

- this plug will only plug into one of the two O2 sensors that come on the B16A (won't fit on the other)

- the O2 sensor that your stock harness plugs into leads to the ECU pin for the OTHER O2 sensor -- yes, it matters.

- you need to switch the O2 sensor pins at the ECU, or cut and solder the wires correctly.

If you have your O2 sensors tied together, you need to fix them. You car uses your O2 sensors to finely adjust your air/fuel ratio. Each O2 sensor is responsible for two cylinders. If the ECU is getting the wrong data, it adjusts the air/fuel ratio incorrectly leading to the stuttering at partial throttle.

 

I threw a spoon computer in the car temporarly and it runs fine now...is that because the o2 runs open loop?

 

yes. i had a 'spoon' ecu for awhile and it was the same. did you tie the o2s together because you don't have the correct manifold? i tried that too. i am currently running the stock ecu with NO o2 sensors connected and it's pretty decent. runs a little rich, but no codes or hesitation. i am getting obd1 parts so i can convert it over and use one o2 this summer.
and i get 25-32mpg as it sits now

 

Yeah iv got an airmass 4-2-1 header with only one o2.

 

change your fuel pump/filter and youll be fine

 

iv got a new filter and walbro fuel pump

 

His problem has nothing to do with the fuel pump / filter. The PR3 ECU is looking for 2 different signals from O2's. I believe that the 1st O2 is for cylinder 1 and 3 and the second O2 is for 2 and 4. If you wire them together, you will normally get 1 and 3 running lean and 2 and 4 running rich (or visa versa)... either way, you're loosing power and mileage.

To fix this problem, either wire up 2 O2's, like factory, chip the ECU with a program that only looks for a single signal, or convert to OBD I.