OK I have a 90 DX hatch with a OBD0 B16A freshly swapped in about 5 days ago. Its got a brand new clutch, axles, timing belt, waterpump and alternator belt and CTR crank pulley. My only problem is when driving with my foot just touching the gas pedal to stay at 60km or 100 km or any speed that I am trying to hold I can feel the engine hesitating and it slowly loses speed. But as soon as I give it slightly more gas its fine and the engine runs flawlessly. This only happens when I am trying to hold a speed without accelerating. I have replaced spark plugs, spark plug wires and cap and rotor hoping that would cure it but it hasnt. Any ideas would be helpful. Its not a big deal, but it is annoying that unless I am always accelerating my engine hesitates.

 

How did you wire up the 2nd O2? Sounds like you may have them backwards.

 

Maybe I am wrong but dont 1st gen OBDO b16as only have one O2 sensor? I paid for a professional install so I didnt have to install anything but the bolt ons before it went in the car, so I dont know if it has 1 or 2 O2 sensors, I didnt bother to look.

 

yes they have 2xo2 sensors in the top part of the exhaust manifold. (both single wire units)

unless that is you have use ben ogles BRE obd0 mapping system to burn a new chip and disable the secondary o2 sensor . which is unlikely by the sounds of it.

 

Had the same symptoms. Switch the o2 sensors and you will be fine. They are right on the exhaust manifold.

 

hey b16er, not to thread jack, but can you get me a pic of how your vacuum hoses are hooked up?? i am doing an obd0 b16 swap in my dx right jnow, and i need help with the vauum lines. thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">How did you wire up the 2nd O2? Sounds like you may have them backwards.</TD></TR></TABLE>

X2 agreed. This is a classic mistake. Get it fixed asap (see below).
http://www.hondata.com/techclosed.html

 

So would I just take the top heat shroud cover off the exhaust manifold and the O2 sensors are right there? When looking at them from the front of the car which O2 should be lined up with which cylinder bank? Are they color coded? Thanks for the help guys.

 

Sorry gsxr, I dont have a digital cam! But shh, I am buying my wife a nice 6 mega pixel one for Christmas. So if you wait a few days, I can do just that.

 

When facing the front of the car, the o2 sensors are just behind the manifold. Right above the down pipe. There are two, one is in the 1-4 cylinder pair. The other is in the 2-3 cylinder pair. see this thread, https://honda-tech.com/zerothread?id=900501

Just reverse the wires.

 

when you say reverse the wires do you mean switch both O2 sensors or just simply cutting each wire and connecting it to the other O2 sensor? thanks

 

this is a pic of the header and O2 sensors.


At pin C8 and C16 are yourO2 wires at the ECU. I beleive C8 is the primary O2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by looxs &raquo;</TD></TR><TR><TD CLASS="quote">when you say reverse the wires do you mean switch both O2 sensors or just simply cutting each wire and connecting it to the other O2 sensor? thanks</TD></TR></TABLE>

Yes

 

well if the o2 sensor thing doesnt work out then get a new fuel filter. I had the same symptoms and it was my fuel filter that hadnt been changed in a long time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">

Yes</TD></TR></TABLE>

wtf kind of answer is that? He has two questions there.

SWAP THE WIRES AT THE ECU BY PULLING THE PIN OUT OF THE CLIP AND PUTTING IT IN THE CORRECT PLACE.

 

I'm feeling generous, so here is how you remove the pins from the clip at the ecu. https://honda-tech.com/zerothread?id=1573760

 

Ha I have the same problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16CRXT &raquo;</TD></TR><TR><TD CLASS="quote">

wtf kind of answer is that?</TD></TR></TABLE>

Oh, I guess taking the completely unnecessary step of de-pinning the harness at the ecu shows how smart you are huh?

Why not de-pin at the sensor connection?


Modified by mar778c at 5:00 PM 12/23/2006

 

yea, because its sooo hard.

HE was asking you a question about cutting the wires. There is never a need to cut any of these wires. Just unpin it from the clip and put it where it needs to be.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16CRXT &raquo;</TD></TR><TR><TD CLASS="quote">yea, because its sooo hard.

HE was asking you a question about cutting the wires. There is never a need to cut any of these wires. Just unpin it from the clip and put it where it needs to be. </TD></TR></TABLE>

Speak for yourself.

Cutting, swapping, and soldering those wires is better than screwing around with the pins in that connector.

If your so hot to de-pin, do it at the sensor connector.

 

i have this same problem...and only one of my o2 censors is wired up! i can see where the other o2 wire is cut...do you guys suggest i hook the cut wire to my opperating censor!? i thought i was the only one w/ this problem!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shortSHIFT &raquo;</TD></TR><TR><TD CLASS="quote">i have this same problem...and only one of my o2 censors is wired up! i can see where the other o2 wire is cut...do you guys suggest i hook the cut wire to my opperating censor!? i thought i was the only one w/ this problem!</TD></TR></TABLE>


1st, check to make sure the O2 sensor that is currently connected is connected to the correct ecu pin.

Next, I would hook the remaining O2 to the correct ecu pin.


Modified by mar778c at 11:15 PM 12/23/2006


Modified by mar778c at 7:55 AM 12/25/2006

 

o2 sensor.

 

Also, you never want to just wire both o2 wires on one sensor. That will accomplish nothing. Stick to C8 and C16.

 

So am I correct to assume replacing both o2 sensors will fix the problem if that is what is causing the hesitation? And also would my ECU throw any codes if the o2s were faulty? I have checked but see no codes.