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Section 5 Engine Diagnostic Tests

22 Diagnostic Repair Manual

Problem 11 – Engine Turns Over But Will Not Start (208/389/420cc Non-EFI Engines)

Problem 12 – Engine “Hunts” / Erratic Idle (208/389/420cc Non-EFI Engines)

ADJUST AND

RE-TEST

REPAIR

OR REPLACE

OFF

TURN

GOOD

SPARK

GOOD

TEST 20 –

CHECK

SPARK

CHECK

FUEL

SUPPLY

CHECK FUEL

SHUTOFF

VALVE

TEST 21 –

CHECK SPARK

PLUG

TEST 26 –

CHECK

IGNITION COIL

TEST 22 –

CHECK

CARBURETION

TEST 24 –

CHECK VALVE

ADJUSTMENT

CHECK

FLYWHEEL

KEY

TEST 25 – CHECK ENGINE /

CYLINDER LEAK DOWN TEST /

COMPRESSION TEST

REPLENISH

FUEL

SUPPLY

REPLACE

IGNITION

COIL

REPAIR OR REPLACE AS NECESSARY

REFER TO ENGINE SERVICE MANUAL

BAD

TEST 28 – REMOVE

WIRE 18 /

SHUTDOWN LEAD

SPARK

GOOD

BAD

REPLACE SWITCH

BAD

CHECK ENGINE

OIL LEVEL

TEST 32 –

CHECK OIL

LEVEL SWITCH

TEST 18 – TEST

OFF-ON SWITCH

REPLACE SWITCH

REPLENISH

OIL

REPLACE LOW OIL ALARM

GOOD

OIL LEVEL O.K.

OIL LEVEL LOW

BAD

REPLACE

REPLACE IGNITION COIL

REPAIR OR

REPLACE

GOOD

BAD

BAD - ENGINE

MISFIRE

APPARENT

GOOD

TEST 23 –

CHOKE TEST

TEST 20 – CHECK

IGNITION SPARK

TEST 21 – CHECK

SPARK PLUG

TEST 26 –

CHECK

IGNITION COIL

*Acceptable running limits for the engine are between 59-61 Hertz.

ADJUST / RE-TEST

TEST 24 – CHECK

VALVE

ADJUSTMENT

SURGING

STILL

SURGING

TEST 22 –

CHECK

CARBURETION

GOOD

TEST 29 – CHECK

AND ADJUST

GOVERNOR

BAD

Brand	Generac Power Systems
Model	XT8000EFI
Category	Portable Generator
Language	English

Generac Power Systems XT8000EFI User Manual

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