Dual Point to Multi Point Fuel InjectionIf you have a Dpfi car this is the most important performance upgrade 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.
The wiring being done is very simple. To someone who is new to working on cars or wiring this can seem like a huge undergoing but it is actually very easy. To those who are weary of doing this or don't understand it, take your time and read through it a couple times until you understand what you will be doing here. you will be doing the wiring for the injectors, crank angle sensor, throttle position sensor (tps), and lengthening some wires. So, get your mpfi manifold on and lets get onto the wiring.
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.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.
MPFI Crank Angle Sensor
Pins B10 and B12 are empty. The wires from C1 and C2 need to be moved there. So 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. Now run the ecu side wires from C1 and C2 into the engine compartment. It would be smart to use a plug or something just incase you need to disconnect wires.
Next is the distributor and crank angle sensor. On the 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 is cut the rectangle distributor plug off of your DX harness. Then you'll take the circle mpfi distributor plug and solder it to your DX harness. Just match the wire colors up. There are 2 white wires but one is larger than the other. 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.
-Looking at the injector plugs you got off the mpfi harness you'll see each plug has a red/blk wire and another colored wire. Run all 4 blk/red wires to the resistor box.
-Looking at the 2 injector plugs on the Dx harness you'll see eack plug has a yel/blk wire and another colored wire. Run both yel/blk wires to the yel/blk wire at the risistor box.
-Injector plug # 1 has a brown wire left. Run this to the yellow wire connected to the Dx injector plug.
-Injector plug # 3 has a blue wire left. Run this to the red wire connected to the other Dx injector plug.
-Before wiring injectors 2 and 4 go to the ecu. Cut the wires located at A3 and A7. A3 is yellow and A7 is red. Run these into the engine compartment.
-Injector plug # 2 has a red wire left. Run this to the yellow wire you ran from A3 into the engine compartment.
-Injector plug # 4 has a yellow wire left. Run this to the red wire you ran from A7 into the engine compartment.