11
Troubleshooting Guide
TROUBLESHOOTING AND ELECTRICAL SYSTEM
TROUBLESHOOTING GUIDE
The following troubleshooting guide will be helpful in identifying operating difficulties should they occur. The guide
includes the symptom, probable cause(s) and suggested checks. The procedures used in making these checks can be
found in the referenced sections of this maintenance and service manual.
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Spark plug is partially fouled or in poor
condition
See Spark Plugs on page 10-11.
Spark plug wire is damaged or loose
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Loose wire connection at ignition coil
Test Procedure 12 – Ignition Spark on page
Intermittent ignition coil failure
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Low cylinder compression
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Water or dirt in the fuel system and/or
carburetor; dirty or clogged fuel filter
Fuel System section
Carburetor improperly adjusted
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Starter failure
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Carburetor solenoid failure
Test Procedure 16 – Carburetor Solenoid
Diode 3 failed open
Test Procedure 7 – Wire Harness Diodes on
Engine does not start easily.
Diode 4 failed open
Test Procedure 7 – Wire Harness Diodes on
Spark plug is fouled or in poor condition
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Spark plug wire is damaged or loose
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Intermittent ignition coil failure
Test Procedure 12 – Ignition Spark on page
Water or dirt in the fuel system and/or
carburetor; dirty or clogged fuel filter
Fuel System section
Engine starts but does not run smoothly.
Fuel pump malfunction; fuel pressure to
carburetor too low
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
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2009-2012 XRT 950 Maintenance and Service Manual
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