Bought a 1990 Honda crx si thought it was a good deal was turning over but no spark, so I assumed maybe distributor. Kept fiddling with it and I think it is the d15b 16 valve with the 2 injectors. Was talking to someone who said the motor goes with the ecu I have but they don't go with the car, because the car was designed for 4 injector engine... I've never heard that. I changed the cap and ignition coil and was getting nothing. this is my first Honda i've worked with Toyota celicas and Toyota corollas but never a Honda so I'm a newbie. any help would be appreciated

 

crx si is a multi point fuel injected car, 4 injectors. the D15b2 with 2 injectors is , you guessed it, dual point FI..

no one actually downgrades their MPFI car into a DPFI car. It can be done but its equivalent to cutting off two of your dogs legs. Let your dog run on all four. If that makes sense.

Search MPFI swap to get a better idea of what im talking about and also why you dont want to do it.

 

Take a pic of the motor and we'll be able to tell you with it's dpfi (2 injectors) or mpfi (stock 4 injectors). The SI should be mpfi, but it's possible someone has swapped a different motor in there.

If you unbolt the ECU from the passenger floor you'll be able to see on one side what model ECU it is if you could take a pic of that barcode as well (should have PXX written on it) we can confirm whether it's correct for the motor.

 

 

That's dual point for sure. What code is on the ECU?

 

 

So far what you said is correct, ECU matches the DPFI manifold, even the distributor appears to be correct looking at the plug. It doesn't look like there's a rotor on it though. Can you verify that one is on there?

 

yeah its on there.. I tested the ignition coil and it was getting power.

someone told me that this motor will not work with this car... I don't understand that but it would try to turn over and I checked the spark plug and was getting no spark, I replaced the cap and ignition coil just to check to see if I was getting power and I was. I assume the dizzy is bad. but I don't want to waste my time trying to install a dizzy if the engine doesn't work for the car?

 

Have you checked the ECU to see if you are throwing any codes? Turn the car to the accessory position and see if you are getting any series of flashes coming from the peep hole in the ECU. Also, check to make sure the ground is connected and clean at the thermostat stat housing. That is a common ground that is overlooked that I think has gotten us all at times.

 

checked the ground, its secure. ecu flashes nothing. I noticed he cut into some wires but I don't know which are which.

 

If this is legitimately an Si chassis you'll need to look up the MPFI conversion and do the opposite (or verify that modifications were done correctly). As is the factory harness won't allow a direct engine swap to a DPFI engine.