Dr.Jeff
True Classic
I have two cleaning systems that I made. One was mainly for the pre-electronic Bosch systems ("CIS", a mechanical injection system with constant fuel through the injector). That cleaning unit is a lot like the second link you posted with a container pressurized by the shop compressor. That allows a much higher pressure delivery for the cleaning solution. The one I made is significantly larger than the linked one. I used a old fire extinguisher bottle for the reservoir and it allows me to run a LOT of solution through each injector (which I find they need). Initially I also used this cleaning system on electronic injectors (like on the X), with a constant 12V feed to keep the solenoid open. It worked OK for some injectors but not for worse ones. So I made the second cleaning unit. It has a module like in your first link to "pulse" the injectors, and I made a rig to submerge the injectors in my ultrasound (US) machine at the same time. However with that setup you cannot pump cleaning solution through the injectors from a canister (my first system) while they are in the US machine...it will overflow the US tank. So I have a spare Bosch fuel pump that draws solution from the US tank and pushes it through the injectors while they are in the US unit (circulating the solution). This works the best.You have some good points Jeff. Have you used any of these products? I picked a cheap pulse unit at random. There are also cleaner reservoirs with pressure supplied from a shop compressor. They also include high pressure fittings for all the major OE connections.
Reservoir unit on Amazon
Combined together they seem to be an affordable alternative to sending injectors out for cleaning.
I suppose a combination of the two items you linked might work. Use the pressurized canister instead of a aerosol can of cleaner. That also allows you to use any cleaning solution you wish. Feed the solution through each injector while pulsing them with the unit from the other link. Although for the price of the two devices you could just about get a set of four injectors professionally cleaned....I believe it runs about $25-30 each. So it depends on how many times you intend to do it. I have multiple vintage cars, plus a seemly constant influx of additional ones. And it wasn't very costly for me to make my own cleaning systems as I already had pretty much all of it on hand.
Something else to consider when cleaning injectors. They have a small screen filter at the very top of each one. You should remove it before cleaning, and install new filters after cleaning. In fact, in some cases it is the filter that's causing most of the problems. The old filter can be removed with a sheet metal screw and pliers. Replacement filters are available online (cheap on AliExpress). They simply push into the top of the injector.
If I recall correctly these are the right filters (but double check it):
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