G643(E) Service Manual Chapter 6. LPG FUEL DELIVERY SYSTEM 204
8. If the FTV duty cycle reading is above 55% adjust
the idle adjustment screw outward and re-check
the duty cycle reading. Continue to do this until
the FTV duty cycle reading is within the optimum
range (45-55%). DO NOT adjust the screw so far
outward that the tamper proof cap cannot be
installed. A duty cycle measurement at Closed
Loop Idle of 40-60% is acceptable if the optimum
range of 45-55% cannot be reached through
adjustment. If the FTV duty cycle cannot be
adjusted below 60%, the mixer is faulty and
should be replaced.
NOTE : If the FTV Duty Cycle reading is NOT
between 25-60%, check for possible vacuum leaks,
manifold leaks, or a faulty mixer.
9. Turn the ignition key to the OFF position to shut
down the engine.
10. Install the tamper proof cap on the idle mixture
screw adjustment port using a large pin punch,
so that no further adjustments can be made
(Figure 42).
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