93 Ex computer and Engine in 91 CRX Wiring Q?
 

I have a 91 crx. It has a 93 Ex computer in it and I wired the harness to be a DX to Si conversion. Then I bought the Hasport shorty subharness that goes from the stock ECU connectors to the 93 EX ecu. But in order to run the 93 Ex ECU I had to wire the Injectors a so(or so says chiltons) Injectors 1-4 red yellow blue and brown to pins A1-A4. Then all four ground wires either yellow/black or black/yellow I grounded to a bolt in the engine bay. Before I had these wires on a 90 crx si resistor box and it wouldn't even run. Now that I got it to run I blows a fuse. Number 14 or the alternator something something that I cant remember right now. Any answers? Thanks

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

on a 93 civic harness the grounds for the injectors dotn ground to teh motor, they ground to a connector by the clutch resivoyr. ground it to thebody and seeif it makes a diffrece.

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

The yellow blacks are not grounds they are power. They are supposed to receive power from from the resistor box which recieves a +12v signal from the main relay when the engine is cranking or when it primes. The ecu supplies the injectors with a pulsing negative(ground) signal from the 4 injector wires to make them fire.

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

exactly
;)

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

they ar not suposto get power from the 12+. They go on the backsie fo the injectors (-side) and then ground to the car at some place. the box SHOULD NOT go between the ECU and the injectors or it will not work.

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

SO in simpler words the colored wires go right to the ecu and the yellow/black wires ground right on the body

Re:93 Ex computer and Engine in 91 CRX Wiring Q?
 

tehy ground somewhere on the body. Just take a multi meatera nd do a continuity test between the yellow/black wire on the injector and then on the pins on the back of that connector by the firewall. Dont worry i have the electrical diagram of the entire car and that is a GROUND.