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Hi again Volks,
    I have received some posts that seem to indicate I need to explain just
what the hell a digitool is and does and what I am talking about in english.
Sorry for being vague.  The digitool allows one to trouble shoot problems
with fuel injection on 83.5-91 vanagons.  With the digitool one can display
all digital and analog signals to and from the ECU.  The signals can be
observed while in operating mode.  You can observe the start signal is being
received by the ecu, the ecu is pulsing the fuel injectors, the o2 sensor
voltage indicates the ecu  is providing the proper mixture, the afm (air
flow meter) wiper has a proper stable voltage, the temperature sensors have
a proper output voltage, the coil is being pulsed , throttle switch is
functional at idle and full throttle, etc etc etc...    With this
information it much  easier to discern that a  part is good or bad, needs
adjusting, or even that it is intermittently bad.

Darrell