I'm aware of the lowcost kits kits and I use these kits myself, but measuring the return-flow with a scope has many advantages:
- Using a GMTO-like system allows a test on the road, with accelerations and at high speeds. Dynamic testing with a lowcost kit is almost impossible, because the cups have to be placed somewhere in the engine bay while driving, the are filled up to fast, diesel fuel gets spilled, etc ...
- The most important advantage is that the system is placed in line with the return-flow system. Common-rail piezo injectors need a pressure in the return-flow system of up to 10 bar. This makes it impossible to do a correct test, with the traditional cups.
With a return-flow sensor the fuelsystem remains closed so the injectors are not influenced by the measurement itself. There are already a lot of diesel-engines out there in Europe with piezo injectors, and if we can't measure the return-flow correctly, in my opinion, we lose an important step in diagnosing common-rail systems.
But even for the traditional common-rail systems, it's big improvement over the low cost kits.
Given the growing marketshare of diesel engines in Europe, combined with the increasing use of bio-fuels, chances are we are facing a lot of injector-problems over the next few years. With these points in mind, an efficient test-kit is no luxury.
I would expect that if Pico sells such a kit, it would be a success.