Problem 19 - Engine "Hunts" / Erratic Idle (220/410/530Cc Non-Efi Engines); Problem 20 - Unit Will Not Idle (220/410/426/530Cc Non-Efi Engines); Problem 21 - Unit Will Not Come Off Idle (220/410/426/530Cc Non-Efi Engines) - Generac Power Systems XT-EFI Series Manual

Section 5 Engine Diagnostic Tests
Problem 19 – Engine "Hunts" / Erratic Idle (220/410/530cc Non-EFI Engines)
*Acceptable running limits for the engine are between 59-62 Hertz.
TEST 23 –
CHOKE TEST
SURGING
NO
SURGING
TEST 22 –
CHECK
GOOD
CARBURETION
REPAIR OR
REPLACE
Problem 20 – Unit Will Not Idle (220/410/426/530cc Non-EFI Engines)
Problem 21 – Unit Will Not Come Off Idle (220/410/426/530cc Non-EFI Engines)
26
STILL
TEST 24 – CHECK
VALVE
ADJUSTMENT
BAD
ADJUST / RE-TEST
TEST 30 – CHECK
AND ADJUST
GOVERNOR
BAD
*Acceptable running limits for the engine are between 59-62 Hertz.
TEST 1 – CHECK
NO-LOAD VOLTAGE
AND FREQUENCY
BAD
FOLLOW
TROUBLESHOOTING
PROCEDURES
*Acceptable running limits for the engine are between 59-62 Hertz.
FOUND BAD COMPONENT
TEST 20 –
GOOD
TEST 21 – CHECK
GOOD
SPARK PLUG
REPLACE
REPLACE MAGNETO
TEST 37 – TEST
GOOD IDLE CONTROL
(STEPS 1 - 11)
FOUND BAD COMPONENT
REPLACE FAULTY
COMPONENT
TEST 37 – TEST
IDLE CONTROL
(STEPS 12 - 13)
REPLACE FAULTY
COMPONENT
CHECK
SPARK
GOOD
BAD - ENGINE
MISFIRE APPARENT
BAD
GOOD
FLYWHEEL
Diagnostic Repair Manual
TEST 27 –
CHECK
BAD
REPLACE