Am currently cleaning my fuel injectors. Soaking the bottom part of injectors in my special blend injector cleaner. Will soak for a week. The first soaking changed the clear fluid to a orange brown color so they must have been pretty gunked up. The 2nd soaking, the fluid has a light orange/brown tint to it, so injectors are still dirty.

Will change fluid 1 more time and soak 2 more days. Then I'll put them in the ultrasonic cleaning machine for a final cleaning. Will power up the injectors during the final cleaning using an ac power source. That way injector will open & close 60 times a second. This will help break up any last bits of varnish built up. Will back flush while in last cleaning cycle.