Briggs & Stratton Vanguard 580000 User Manual

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Troubleshooting
When troubleshooting an engine with EFI, basic
engine operating problems must be addressed
before turning to the EFI system components.
Engine starts hard or fails to start when cold
1. Fuel pump inoperative
2. Engine temperature sensor inoperative
3. Insufficient fuel pressure
4. Crankshaft position sensor inoperative
5. Crankshaft position sensor offset incorrect
6. Old/stale fuel
7. Low system voltage
8. Injectors clogged or restricted
9. Coils inoperative
10. Spark plugs fouled, worn, or damaged
Engine starts hard or fails to start when hot
1. Fuel pressure low
2. Fuel pump inoperative
3. Insufficient fuel pressure
4. Crankshaft position sensor inoperative
5. Crankshaft position sensor offset incorrect
6. Injectors clogged or restricted
7. Spark plugs fouled, worn, or damaged
Engine misses, hesitates, or stalls under load
1. Fuel injectors/fuel filter/fuel line dirty or
restricted
2. Air cleaner dirty
3. Fuel pressure or fuel volume insufficient
4. Vacuum (intake air) leak
5. Governor setting incorrect
6. Spark plugs fouled, worn or incorrect gap
7. Plug wires loose or worn
Low Power
1. Air cleaner dirty
2. Fuel pressure insufficient
3. Governor setting incorrect
4. Exhaust system plugged or restricted
5. Injector(s) dirty or clogged
Electrical System
The EFI system is 12VDC with negative ground. A
fully-charged 12 volt battery with a minimum of 350
cold cranking amps is required to maintain reliable
system operation. Battery condition and state of
charge should always be checked first when
troubleshooting the EFI system.
EFI-related problems are more likely caused by the
wiring harness or connections than by the EFI
components. Even small amounts of corrosion or
oxidation on the terminals can interfere with the
milliamp currents used in system operation.
Cleaning the connectors and grounds will solve
problems in many cases.
If a fault code indicates a problem with an EFI
component, disconnect the ECU connector and test
for continuity between the component connector
terminals and the corresponding terminals in the
ECU connector.

Briggs & Stratton Vanguard 580000 Specifications

General

Fuel Type	Gasoline
Governor Type	Mechanical
Engine Type	4-Stroke, OHV
Oil Capacity	1.9 L (2.0 qt)
Ignition System	Electronic
Cooling System	Air-cooled
Starter Type	Electric