Hi,

I just finished wiring up my 88 crx dx to a 1991 b18a1 motor. I followed this guide to do it http://www.fourthgenhatch.net/mpfi.html and soldered and heatshrinked all wiring. Upon starting of the car it was running rough and throwing code 16 fuel injectors.

So we began the troubleshooting using the helms manual. First we tested the resistance of the injectors and they all panned out within spec. Then we tested for voltage to the 2p connectors with ignition on and no voltage was present. The weird thing is if were turn the car over and let it run, the injectors have voltage then.

Next we checked the pins at the ecu a1 has no voltage, a3 has 7.7, a5 has 7.7, and a7 has 10.1 As far as I understand, the ecu grounds the injectors which is how they pulse correct? so why does a1 have 0v? Somehow I think that is the problem. Whats really weird is when its idling if you unplug any of the injectors it runs worse, like it dropped a cylinder, then you plug it back and it sounds the way it originally did.

I'm totally stumped and looking for any ideas or other troubleshooting i could look into.

Adam

P.S Also pulled the main relay and it tested good and looked fine(no cracked solder etc)

 

I just remember another question I wanted to ask. On the guide I used it wasn't very clear on whether you are supposed to T into the a3 and a7 wires or cut and only use the ecu side to your new injector wiring and tape off the other side. Can someone clarify for me which route your supposed to go?

Thanks

 

Hi,

Just wanted to update this post so if someone ever has this problem in the future they might be able to use this. Since the guide I used wasn't that clear, instead of cutting a3 and a7 in half and no longer keeping the original harness side connected, we had both the harness side, and the new wires we ran connected which resulted in the ecu sending ground to two fuel injectors at the same time causing the code and general crappy running.

Adam

 

Adam, congrats on being a great H-T member. Even though nobody replied, you still updated this thread. It will make searchability possible in the future for other members. to you!