Dual Point to Multi Point Fuel Injection

     If 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
  • 88-91 Si intake manifold and brace
  • 88-91 Si throttle body and gasket
  • 88-91 Si ecu (good) 88-89 Integra (better) DOHC ZC (best)
  • 88-91 Si resistor box
  • 88-91 Si distributor
  • injector plugs
  • intake
  • extra wire
  • plug with atleast 4 wires
Removal
     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.
At the Ecu
     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.
Injector Wiring
     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.
DPFI Vs. MPFI Ecus
DPFI
MPFI
Pin #
Wire Color
Function
Wire Color
Function
A1
Yellow 2
Aux Injector
Brown
#1 Injector
A2
Black 1
Main Relay/Ground
Black 1
Main Relay/Ground
A3
Yellow 1
Aux Injector
Red
#2 Injector
A4
Black 2
Main Relay/Ground
Black 2
Main Relay/Ground
A5
Red 2
Main Injector
Light Blue
#3 Injector
A6
Green
Purge Cut Off Valve (Coil)
Green>
Purge Cut Off Solenoid (Coil)
A7
Red 1
Main Injector
Yellow 1
#4 Injector
A8
Yellow 3
Sedan LX A/T
A10
Red
EGR Solenoid Control Valve (coil) (A/T Only)
A11
Blue/Yellow
EACV (Coil)
Blue/Yellow
EACV (Coil)
A12
Green/Black 2
Main Relay
Green/Black 2
Main Relay
A13
Yellow/Black 2
Main Relay
Yellow/Black 2
Main Relay/Injector Resistor Box
A14
Green/Black 1
Main Relay
Green/Black 1
Main Relay
A15
Yellow/Black 1
Main Relay
Yellow/Black 1
Main Relay/Injector Resistor Box
A16
Brown.Black
Ground
Brown/Black
Ground
A17
A18
Black/Red
Ground
Black/Red
Ground

DPFI
MPFI
Pin #
Wire Color
Function
Wire Color
Function
B1
White/Green
Hazard Fuse
White/Green
Hazard Fuse
B2
Orange
Tandem Control Solenoid Valve
Blue 1
Fast Idle Control Solenoid Valve
B3
Yellow
A/C Clutch Relay
Yellow
A/C Clutch Relay
B4
Yellow/Green
Radiator Fan Relay
Yellow/Green
Radiator Fan Relay
B5
White/Yellow
Alternator
White/Yellow
Alternator
B6
Green/Orange
Check Engine Warning Light
Green/Orange
Check Engine Warning Light
B7
Green/Orange
A/T Shift Position Console Switch
B8
Blue/Red
A/C Switch
Blue/Red
A/C Switch
B9
B10
Orange
Crank Angle Sensor
B11
Green/Black
A/T Shift Position Console Switch (Drive)
B12
White
Crank Angle Sensor
B13
Blue/White
Main Relay
Blue/White
Main Relay
B14
Blue 2
To yellow, To Alternator
Blue 2
Alternator
B15
White 1
Ignitor Unit
White 1
Ignitor Unit
B16
Yellow/Red
Speed Sensor
Yellow/Red
Speed Sensor
B17
White 2
Ignitor Unit
White 2
Ignitor Unit
B18
B19
Green/Red
Electric Load Detector
Green/Red
Electric Load Detector
B20
Brown
Ignition Timing Adjusting Connector
Brown
Ignition Timing Adjusting Connector
+
DPFI
MPFI
Pin #
Wire Color
Function
Wire Color
Function
C1
Orange
Crank Angle Sensor
Blue/Green
Cylinder Position Sensor
C2
White 4
Crank Angle Sensor
Blue/Yellow
Cylinder Position Sensor
C3
Orange/Blue
TDC Sensor
Orange/Blue
TDC Sensor
C4
White/Blue
TDC Sensor
White/Blue
TDC Sensor
C5
Red/Yellow
TA Sensor
Red/Yellow
TA Sensor
C6
Red/White 1
TW Sensor
Red/White 1
TW Sensor
C7
Red/Blue
Throttle (Position) Angle Sensor (TPS)
Red/Blue
Throttle (Position) Angle Sensor (TPS)
C8
Yellow
EGR Lift Valve Sensor
C9
Red/White 2
PA Sensor
Red/white 2
PA Sensor
C10
Green/White 3
Brake Switch
Green/White 3
Brake Switch
C11
White 1
MAP Sensor
White 1
MAP Sensor
C12
Green/White 2
EGR Lift Valve Sensor/Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor
Green/White 2
Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor
C13
Yellow/White
EGR Lift Valve Sensor/Pa Sensor/TPS Sensor
Yellow/White
Pa Sensor/TPS Sensor
C14
Green/White 1
MAP Sensor
Green/White 1
MAP Sensor
C15
Yellow/Red
MAP Sensor
Yellow/Red
MAP Sensor
C16
White 3
O2 Sensor
White 3
O2 Sensor

-4thgencivic