Troubleshooting; Engine Cranks But Will Not Start; Starter Does Not Crank; Engine Starts But Does Not Keep Running - Toro 520XI Service Manual

Engine cranks but will not start.

Possible Cause
Incorrect starting procedure
The fuel tank is empty
The fuel shut-off valve is closed
Dirt or water is in the fuel system
Clogged fuel line
The spark plug lead is disconnected
The kill relay not energized
A spark plug is faulty
Faulty ignition module

Starter does not crank.

Possible Cause
Blown or loose fuse
Battery is discharged
Safety interlock system malfunctioning
Faulty starter or starter solenoid
Seized internal engine components
Poor ground; loose connections

Engine starts but does not keep running.

Possible Cause
Misadjusted or faulty choke or throttle control cable
The fuel tank vent is restricted
Dirt or water in the fuel system
The fuel filter is clogged
The fuel pump is faulty
The carburetor is faulty
Loose wires or poor connections
The cylinder head gasket is faulty

Engine is difficult to start.

Possible Cause
Improper starting procedure
Dirt or water in the fuel system
Clogged fuel filter
Loose wires or poor connections
Misadjusted or faulty choke or throttle control cable
Faulty spark plug
Low compression
5xi Series Tractor Service Manual
GASOLINE ENGINE
Corrective Action
Ensure throttle is at full, and choke is on
Fill with fresh fuel
Open fuel shut-off valve
Drain and flush fuel system; add fresh fuel
Clean or replace
Reconnect spark plug
Inspect safety switches and wiring
Replace spark plug
Replace ignition module
Corrective Action
Determine cause, correct and replace fuse
Charge battery or replace if necessary
Inspect safety switches and wiring harness
Replace
Replace
Clean and tighten
Corrective Action
Adjust or replace
Vent system hoses kinked or plugged, clean or repair
Drain and flush fuel system; add fresh fuel
Replace the fuel filter
Repair or replace
Clean or rebuild
Check and tighten wire connections
Replace
Corrective Action
Ensure throttle is at full, and choke is on
Drain and flush fuel system, add fresh fuel
Replace
Troubleshoot and repair
Adjust or replace
Replace
Test compression, correct as needed

TROUBLESHOOTING

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