Miller PipePro 304 Owner's Manual page 44

Trouble
Engine does not go to low (idle) speed
with Engine Control switch in Run/Idle
position.
Engine does not go to high (run) speed
when generator power or large weld
load is applied with Engine Control
switch in Run/Idle position.
Engine uses oil during run-in period;
wetstacking occurs.
Coolant recovery tank continuously
overflows.
Notes
OM-492 Page 40
Be sure Engine Control switch S2 is in Run/Idle position.
Remove all weld and generator power loads.
Turn off remote device connected to Remote 14 receptacle RC14 (see Section 5-8).
Check for obstructed movement of throttle solenoid linkage.
Have Factory Authorized Service Agent check voltage regulator board PC8 and current transformer
CT1.
Place Engine Control switch in the Run position. Have Factory Authorized Service Agent check unit.
Dry engine (see Section 10 and engine manual).
Bleed air from radiator, and replace lost coolant (see Section 5-3).
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Remedy