I have a 90 Integra and I put a b16a in it. I'm running really rich! almost using a tank a day of gas. Blowing blank smoke out my exhaust! I have a pr3 ecu and my eng light is not coming on when I put a stock LS ecu in it the eng light come on! If any one can help me out please let me know what i can do!!!

 

Isn't a B16A a vtec motor? Why would you run a stock LS ECU on a VTEC motor?

 

NO I HAVE A PR3 IN IT NOW!! I TRIED AN LS TO SEE IF IT WAS THE ECU!!!

 

Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. This could be caused by a faulty ecu (ruled that out though), leaky injector, or a faulty fuel pump. Check your oil and make sure that the fuel has not contaminated it.

 

so its not the o2 sensors because i dont have ne o2 in it right now??

 

without your o2 sensor you should be pulling a CEL, when you dont have a o2 sensor the ECU goes into closed loop and runs pre-programmed fuel maps that honda included in your ECU which may very well be SHOT.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondateg10 &raquo;</TD></TR><TR><TD CLASS="quote">so its not the o2 sensors because i dont have ne o2 in it right now??</TD></TR></TABLE>

It's probably that, how is your engine supposed to know a correct air/fuel mixture without it?

 

ok am i supposed to have 1 or 2 o2 sensors because i only see one place to screw in the o2 sensor.... can ne one get me a diagram on the wiring for the o2

 

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

It's probably that, how is your engine supposed to know a correct air/fuel mixture without it?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondateg10 &raquo;</TD></TR><TR><TD CLASS="quote">ok am i supposed to have 1 or 2 o2 sensors because i only see one place to screw in the o2 sensor.... can ne one get me a diagram on the wiring for the o2</TD></TR></TABLE>

Since you have a 90 I'll assume you have OBD-0 or 1, so you need one 02 sensor. As far as the diagram, SEARCH, SEARCH, SEARCH.

 

obd0 b16a's have 2 o2 sensors, obd1's have 1 o2 sensor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GRAF-FITI &raquo;</TD></TR><TR><TD CLASS="quote">obd0 b16a's have 2 o2 sensors, obd1's have 1 o2 sensor</TD></TR></TABLE>

Really? Two in the exhaust mani., or one in the manifold, one in the cat?

 

when he doesn't have an o2 plugged in, doesn't it mean that the ECU is dumping the maximum amount of fuel into combustion as if it were WOT or during a cold start? that would explain the bad gas mileage...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GRAF-FITI &raquo;</TD></TR><TR><TD CLASS="quote">obd0 b16a's have 2 o2 sensors, obd1's have 1 o2 sensor</TD></TR></TABLE>

This is correct.

Obd 0 is 2 1 wire O2 sensors and they are different. They read different voltages to send to ecu so they can not be "Tapped" together.

OBD1 has 1 wire, 4 wire and 5 wire O2 sensors depending on the engine.

Maybe not so much 1 wires but cx, dx, lx, ex, and si have 4 wire and VX have 5 wire.

Hope this helps and yes without an O2 you will run pig rich. But you should be throwing a code. Check the light on your ecu I bet that its blinking.

 

man that all helped a lot!!! I have one hooked up now and i have no more black smoke!!! but one more question, where do i put the second o2 sensor?? i only see one place to hook up a o2!!!

 

Are you running an aftermarket header? You might just have to get it tapped for an 02 bung.
-Rik
P.S. I beleive it's pre-cat

 

no i just have the stock headers