G643(E) Service Manual
243
Chapter 7. Basic Troubleshooting
Rough, Unstable, Incorrect Idle, or Stalling (cont’d.)
PROBABLE CAUSE
CORRECTIVE ACTION
Excess flow valve closed
Reset excess flow valve.
•
Close liquid valve.
•
Wait for a “click” sound. Slowly open liquid valve.
Clogged fuel filter
Repair/replace as required
See Chapter 2 Fuel Filter Replacement
Plugged fuel line
Remove obstruction from the fuel line.
•
Close liquid fuel valve.
•
Using caution, disconnect the fuel line (some
propane may escape).
•
Clear obstruction with compressed air.
•
Re-connect fuel line.
•
Slowly open liquid fuel valve & leak test.
Fuel lock-off malfunction
Repair/replace fuel lock-off.
See Chapter 2 Fuel Lock-Off.
Faulty vapor connection
between the pressure regulator/converter and the
mixer
Check connection.
•
Verify no holes in hose.
•
Clamps must be tight.
•
Look for kinked, pinched and/or collapsed hose.
Pressure regulator freezes
Check level in cooling system:
•
Must be full, check coolant strength
•
-35°F (-37°C) minimum
Check coolant hoses.
•
Watch for kinks and/or pinched hoses.
•
Verify one pressure hose and one return hose.
Test regulator. See Chapter 6
Vacuum leak
Check for vacuum leaks.
•
Between mixer and throttle body
•
Between throttle body and intake manifold
•
Between intake manifold and cylinder head
Related MIL Faults:
EST faults
ETC Sticking fault
Pre-catalyst adapts error
