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DFI and ECMDiscuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.
Sorry if this isn’t titled properly. After hemming and hawing about if for the entire spring, I’m taking the plunge and fuel injecting my 69 Camaro. It will cost me more if not the same to do a new carb and dizzy setup so why not inject it?
I have FIRST intake, a 730 ECM from a 92 Z28 with EBL FLASH P4, and a wiring harness from a 91 Z28. Don’t ask me why the OP did it that way but he did. The harness while ugly is mostly intact with all the pertinent sensor connectors. Here’s what I need this harness to do:
Control the injectors
Control the timing (system came with computer dizzy)
Control my lock up converter. That is it. I know I will need to get a VSS.
Could one of you experts tell me what pins on the back of the ECM are vital to what I want to do so I can get rid of the wires I don’t need? I don’t see why I should pay $300 for a new harness when this one is serviceable. Thanks.
It is easier to list what is not required. For a VSS can use either a 2K PPM digital signal, or a 4K PPM magnetic signal (sine wave). The digital requires one wire to the ECM, while the magnetic requires two wires to the ECM. Stock f-body used the magnetic VSS.
So not needed:
B11, VSS to speedometer
C1, VSS to cruise control
C9, A/C active to ECM, unless car has A/C then keep it
D12, secondary fan active
E8, primary cooling fan relay drive (although an electric fan is a nice add-on).
E9, EGR solenoid
F1, MT shift light
F2, AIR solenoid
F4, AIR solenoid
F7, CCP solenoid
F10, passkey
So all the wires going to those pins can be eliminated, correct? Just want to make sure before I get started.
To a point, you haven't checked which ones I listed? Are you running a '69 Camaro with California AIR requirements? Then you will need to retain those.
This is why you haven't received other replies, how are we supposed to know exactly what the requirements are?
Are you running an aftermarket speedometer? Maybe an electronic one?
There is no way you should take my post as absolute...
No, it’s not a California car. There are no electric fans. There is no air conditioning. Only relays on the car are on my headlights. I have a 2004r Transmission. My tach is a 69 face with Stewart Warner guts behind it because that is the only thing that would work with HEI. The car has factory console gages which I figure will operate like they always have. The computer distributor has a 4 pin connector port and a two pin connector port on it. What else do you need to know?
When I did my first EFI retro-fit on an older car, I laid the harness out and labeled every connector. A piece of masking tape and a sharpie works for this. Then opened all of the loom (tape and tubing).
Went through the harness and removed any wires that weren't required. Then spot taped areas of the harness together. And test fit it to the car.
Then progressed from there. In the first year I didn't have the fuel system finished so I put the carb back on and ran the EFI as a spark controller only. That Winter finished the fuel delivery and the TBI went back on for the Summer and ever since.
Thanks. That is exactly how I planned on doing it. Is there a way to mount the ECM in the engine bay? Of course it would need some kind of enclosure. Will it be able to handle the under hood temps? What other concerns would there be?
I feel like an idiot but how does this bulkhead connector separate? I can see the locking tabs on the side and back. Is there a screw or bolt in the hole on the black part on the pic. All I’m getting is some hardened clear goop. What about the two tabs in the other pic?
Many thanks. That link answered every question I had. Got it started coming apart but seemed like it was going to break. Now that I know it’s just a pass- thru connector I don’t have to worry if it cracks. Don’t need it to mount in my 69. Thank you again.
Ok. Learning a bit more about these Third Gen Camaros and their wiring. I did not know they had a separate coil. I am an HEI guy. My tach has a brown tach lead wire. I take it that I will have to splice it onto the coil. There is nothing tach related when unpinning an ECM, correct? Thanks.
the harness is set up for hei divorced coil. The distributor will need the four wires from ecm.
same for coils in cap. Tach signal can be had at coil or coil in cap distributor next to distributor power.
if your going to run a large cap hei get a packard Delphi weather pack four connector.
Last edited by Tuned Performance; 07-20-2020 at 08:06 PM.
I’ll just run the distributor I got with the set up. Have got the 4 pin connector for it labeled, map sensor connector, tps connector, IAC connector, coolant temp sensor connector. I thought the coolant sensor connector went to the distributor but now I know there is a separate coil on these I looked up the coil to distributor harness so I know what that looks like. Am in process of unwrapping the harness to start stripping wires. Thanks for your help.
07-16-2020, 10:22 AM
