i got a 91 crx b16 obd0 setup,
running a pr3 ecu and one o2 sensor.
it hesitates a higher rpms and blows blackish smoke.
should i get my ecu chipped and eliminate the 2nd o2 sensor?
thanks
jon

 

have fun

 

SO CAN I JUST RUN ONE O2SENSOR?
THANKS
COOL PICS/DIAGRAM

 

no, you need 2, as per pics/diagram

 

EVEN IF I GET MY ECU PROGRAMED SO ONE IS ELIMENATED?
THANKS
GUYS

 

and if i do need two o2sensors, what vehicle
do i buy them for and are they both the same?
thanks

 

go to oxygensensors.com pick up a o2 sensor for under 40 bucks.
get the o2 sensor of a crx.. and your good to go..

 

just get 88-91 civic/crx o2 sensors. 2 of them.

 

i chipped mine to run 1. it runs great and its 1 less bung you have to add.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LEGUTKI &raquo;</TD></TR><TR><TD CLASS="quote">i chipped mine to run 1. it runs great and its 1 less bung you have to add.</TD></TR></TABLE>

THATS WHAT I WANT TO DO, I RUNS GOOD? ANY CODES?
THANKS

 

I have a 90 si with the pr3 b16. My car has both o2 sensors ran off the run before the cat. Is this bad? Don't mean to steal the post or anything.
Thanks

 

that will work, but isn't "ideal". you may run rich or lean on 1 or 2 cyl's.

 

Well what can I do to fix this?

 

PR3 ECU can run on 1 O2 without throwing any codes. Just hook up the primary o2. Ask me how I know

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by roadawg &raquo;</TD></TR><TR><TD CLASS="quote">PR3 ECU can run on 1 O2 without throwing any codes. Just hook up the primary o2. Ask me how I know </TD></TR></TABLE>


YEAH IT wont throw codes, but does it run rich?
tell us how

 

ok guys.. the ECU uses 1 o2 sensor to monitor a/f mixture in 2 of the 4 cyl. that's why they are seperate.

1 o2 monitors 1 & 4 the other monitors 2 & 3.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jondancer &raquo;</TD></TR><TR><TD CLASS="quote">


YEAH IT wont throw codes, but does it run rich?
tell us how
</TD></TR></TABLE>


I will find out the exact A/F when I hit the dyno, for now it seems to be running fine, I get an average of 30 MPG.

I always thought the pr3 needed two o2's to run without throwing a code, but I guess not because I only have the 1 primary o2 hooked up and it doesn't throw any codes.

Maybe the pw0 needs 2 and the pr3 needs one without throwing a code? Thats the only thing I can think of...

 

just because your not thorwing a code, does not mean that your car is working properly. Either drill the holes and make room for the new bung, or convert to obd1. If it's ment to have 2 it needs 2. The only time it will work is when your in WOT just because its open loop.