I did a b16a swap in my 90 crx dx and everything went alright. I have been driving the car for like 3 months or so and I have loved every minute of it. Except the fact that it is running super rich. The back of my car is coated in a film of black unburned fuel. I have tried everything to try to fix it and all of the mechanics I brought it to couldnt figure it out. The motor is stock. I am running a PW0 ecu. I have changed the timing belt and adjusted the timing. Changed Dizzys. Changed injectors. O2 sensors. All of my sensors put out the right voltage they all test alright. I checked my valve clearance and thats alright. This is killing my gas mileage. I am running out of options to figure it out. Does anybody have any ideas of what it could be? I was thinking that maybe its my throttle body but I dont really know. I know somebody out there has had the same problem and knows how to fix it.

 

What ECU is a PW0?

 

Is that your crx ecu?

 

Pw0 is the jdm b16 computer from a DA i believe...it has 2 o2 sensors on the header. I would look into your injectors...check if they are good. You should also compression check your motor...you might have low compression numbers meaning you arent bringing in enough air to support the stock fuel maps...IDK...you could also try changing your fuel filter and change the computer...my friend had a pr3 that kept dumping fuel even when the motor was off...when we pulled the plugs we had pressurized fuel shoot out old faithful style...hope i helped.

 

Well I have changed the injectors and I have a PR3 ecu that does the same thing and my compression is fine. Everytime I change my spark plugs they just get all black **** on them again. IDK what it is

 

ummm try get a set of spark plugs that are 1 step hotter....also who did the MPFI conversion make sure everything is soldered correctly...cause but connectors i believe add resistance

 

do you have a fuel pressure regulator? are you using the correct vacuum line for the fpr? if the line is smaller it will raise pressure