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Dual Point to Multi Point Fuel InjectionIf you have a Dpfi car this is the most important mod you can do to your car. The gains will be around 8-12 hp. Bolt ons will actually benefit your car to. With the dual point intake there really isn't anything you can do to your car to gain any real hp.Parts Needed
Before you remove anything the radiator must be drained. Then disconnect the coolant hoses going to the intake manifold. Disconnect anything else going to the intake manifold like vacuum hoses, the fuel fuel, and the wiring harness. Disconnect the bracket behind the intake manifold and then the intake manifold. Do all the wiring before installing new manifold. TPS and EACV The TPS is on the throttle body on the opposite side of the trottle cable. The EACV is on the back of the intake manifold and it plugs straight up.You are going to need to extend the TPS and EACV wires. Extend the throttle position sensor about 8" and the EACV about 5". While extending the the tps switch the green/white and yellow/white wires. If you don't switch the wires the computer will think the throttle is in the opposite position it is actually in. 
Pins B10 and B12 are empty. You can get pins from B2 and B11. Now cut C1 and C2 off but leave some wire because you will use these. Run The wire you cut off at C1 which is orange to B10 and the wire you cut off at C2 which is white to B12. Cut wires A3 and A7. Now run the ecu side wires from C1, C2, A3, and A7 into the engine compartment. It would be smart to use a plug or something just incase you need to disconnect wires. Use the diagram below for placement of ecu pins. 
Find the green and brown plugs you took off of the dual point intake manifold. These are the primary and secondary injector plugs. The green is the primary and has a yellow and yellow/black wire. The brown is the secondary and has a red and yellow/black wire. Run both yellow/black wires to the yellow/black wire on the injector resistor box. Run the yellow wire from the DX primary injector to the #1 injector which is a brown wire. Run the red wire from the dual point secondary injector to the #3 injector which is a blue wire. The # 2 injector is a red wire. Run the to the wire you ran into the engine compartment coming from A3. The # 4 injector is a yellow wire. Run this to the A3 wire. Now run all 4 of the red/black wires coming out of each injector to the injector resistor box. Distributor and Crank Angle Sensor Next is the distributor and crank angle sensor. On bthe Si motor the distributor has 7 wires and the Dx or Std have 5. This is because the Mpfi motors have a crank angle sensor. What you'll need to do for this is 1 of 2 things. Either put a dual point distributor plug on the multi point distributor or put a multi point harness side distributor plug on on dual point harness. I recomend keeping the stock plug on the distributor and changing the plug on the harness. If you are putting the plug on the distributor cut the dual point distributor plug off the dual point distributor. Be careful, there are 2 white wires and right by the plug there is a small piece of red tape on one of the white wires. This is the only way to tell them apart. Now cut the plug off of the distributor on the motor, while paying attention to which white wire has the red tape, and match the colors of the wires off the distributor to the wires on the dual point distributor plug. If you get the white wires confused just don't solder them and wait til you fire the motor up to see if they are right. Now plug the distributor plugs together. There will be 2 wires left coming out of the distributor, a blue/green and a blue/yellow. These are for the crank angle sensor. Blue/green go's to C1 and blue/yellow go's to C2. If you are putting the multi point harness side distributor plug on the dual point harness match the wires like above and then run the 2 blue wires the same way.
-4thgencivic | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
