I got a box of stuff on a kbid auction and this was in there. Everyone that knows me knows that EFI gives me the hives… but what could this be for?? There are no numbers on it anywhere
Automobiles have 2 designation for wire. Primary and Secondary. Secondary I’d spark plug wire and everything else is primary…..if that helps
Sun is now part of SnapOn. https://la.sun-workshopsolutions.com/en/welcome-sun Good luck getting anything from them. I did find some older catalogs archived, but too old for that. Might be useful for the Old Equipment thread, though. https://archive.org/details/catalogs?tab=collection&query=Sun+equipment
Something to test/check if the injectors are firing/pulsing?!? I’m thinking it goes between a piece of diagnostic equipment and the injectors
Most injectors are 1. pretty low amps. No need for the big lugs on the top. 2. Powered at ignition on, ground side controlled. So the 2 Green leads and the Black lead at the bottom don't make a lot of sense. 3. Early American EFI stuff was tested with Noid lights, small LED bulbs in plastic with leads that fit into the harness connectors and blinked. 4. Euro EFI was those air meter and fuel distribution Bosch systems, which wouldn't need a powered box to test, from my very limited understanding. https://members.rennlist.com/pbanders/djetfund.htm
You are pushing the memory of a 17 year old kid that is now nearly 69. If I remember correctly, when EFI first came out, there were test gizmos from different companies that the mechanics could hook up and could make the EFI run a few minutes, as long as the fuel pump functioned correctly. Most early EFI were throttle body units. You could connect the gizmo between the distributor pick up coil and jump to the injector (the box provided a consistent injection timing and fuel flow to open the injectors) and could get the car to run long enough to get it into or out of the garage. We had one of those boxes in our Power Mechanics shop, my 1st year there. It probably would have been the Sun unit like you have, every test piece in the shop was Sun test equipment. The shop teacher had a fully functioning Bosch EFI set up in the auto shop in 1973! He left at the end of the school year and took the EFI stuff with him. I caught a brief description of its function before the teacher left. The biggest problem was when each car company came out with their own EFI system, instead of using the Bosch system (it had a copyright, they would have had to buy it from Mr Bosch), the gizmo didn't work on all of them. The unit was designed to work on the Bosch system, and since the US companies did not use the Bosch system, that made the tool pretty useless, pretty quickly. Essentially, that Sun equipment box used the Bosch distributor pickup system to produce the injection timing for temporary motor operation at a very limited window of function, it bypassed the computer monitoring system.
From ChatGPT The device in your photo is a Sun E.F.I. Adapter, a piece of vintage automotive test equipment used with diagnostic machines—specifically for vehicles with Electronic Fuel Injection (E.F.I.) systems. What It Does: This adapter helps interface EFI vehicles with older Sun diagnostic scopes or analyzers (like distributorless ignition systems or early EFI systems from the 1980s and 1990s). It allows the test equipment to read signals like: Battery voltage (via the red terminal) Primary ignition signal (via the blue terminal) These signals are fed into the diagnostic scope so the technician can analyze engine performance, timing, ignition waveform, and other parameters that are crucial for EFI diagnosis. Usage Context: Typically used in professional or advanced home garages. Works with Sun Engine Analyzers (like the Sun VAT or oscilloscope-based diagnostic tools). Used during a time of transition from carburetors to fuel injection.
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