Wiring

The first issue was finding a mounting place for the ECM. I found that there is quite a bit of room behind the passenger side dash panel. Some simple brackets were made that bolted to the birdcage. The harness is routed on top of the AC/Heater box, and then through the firewall.

Speaking of the harness, I made some modifications. The ECM can control a cooling fan. It is a neat feature that lets the user set a on and off temperature for the fan. However, for some reason the pin on the harness has no wire connected to it. I found that there was a wire I would not use, which is the 'Park/Neutral' input. This input would be connected to a switch on the tranny telling the ECM the car is in park/neutral and is used in some applications where a long duration camshaft is used and the engine wants to stall. The park/neutral input tells the ECM it is supposed to idle and can keep the engine from stalling. This will not be an issue on my engine, since the cam is moderately sized. I moved the pin in the ECM connector to the fan output.

The second modification was to compensate for my exhaust cut-outs. Since this is a speed density system, the ECM cannot compensate for the increased airflow when the exhaust is opened up. My plan is to use the Nitrous function of the system to add additional fuel. I will have a switch that tells the ECM nitrous is on. I will then program the ECM to add a small amount of extra fuel. This should enable correct air/fuel mixture with open exhaust. Again, this pin was not wired in the connector, so I moved an unused pin. For this one, I used the points rpm input. It will not be used as I'm installing a 82-86 computer controlled HEI and it has a separate connector to the ECM.                    

There are still a few wires left to connect. I will mount a RPM module that controls a shift light next to the ECM. I also need to extend the wires for the PC-link, and mount a switch that controls the "Nitrous" (see above).

On to the engine compartment. I already had a set of electric fans. I decided to wire them so that one is controlled by the AC, and the second one by the ECM. I mounted the 2 cooling fan relays as well as a relay that comes with the EFI on a bracket. I also installed a 4-fuse holder that distributes power. 2 fuses are for the fans, one for the EFI and the last one is replacing an inline fuse next to the horn relay that was factory.

The not-so-pretty relay in the middle is factory...

The engine harness came in 2 parts from Holley. The main harness had all the sensors, and a second harness was for the injectors. I did not much like this setup as there would be too many harnesses on the engine. I decided to custom make my own harness out of the 2 harnesses holley provided. This took some time, but was simple enough. It just required cutting the wires that were too long, routing them nicely and then put the provided loom around it. All wires were SOLDERED, not crimped and heatshrink was used for protection (NOT electrical tape). This is the only way to do it right!

Drivers side harness wiring the injectors and the IAT sensor. At this point the vacuum hoses are also hooked up, but the distributor is not yet installed.

Passenger side harness wiring injectors and the TPS. Also notice the heater hose fitting in the manifold. I found that the stock, straight-up, fitting made the hose interfere with the fuel rail, and just plain didn't look nice. A trip to the hardware store yielded a 1/2 NPT, 5/8" Barb 90-degree fitting that fit much better.

The rear of the manifold where you can see the crossover harness. It also wires the MAP sensor as well as the IAC motor. Two small vacuum hoses connect to the throttle-body. One goes to the AFPR and the second to the MAP sensor. The MAP sensor bracket was provided in the kit. The fittings in the runners (one visible just under the MAP sensor, and the second in the left side runner go to the headlights/wiper door and power brake booster. They were not provided and had to be drilled and tapped (see the manifold page for more details). You can also see that the return hose is not yet hooked up (the fitting is capped). The 2 looms in the right hand foreground are not routed yet. One will go to the distributor, and the other one to the O2 sensor.