Page 41 - Manual_Polaris_RZR_ProXP-20-21

GENERAL INFORMATION

ENGINE TROUBLESHOOTING
1
SPARK PLUG FOULING

• Spark plug cap loose or faulty • Injector Spray Pattern • Oil contaminated with fuel
• Incorrect spark plug heat range or • High Leakdown • Weak ignition (loose coil ground,
gap faulty coil, or stator)
• Valvetrain / Valve Clearances
• PVTsystem calibrated incorrectly/ • Restricted engine breather system
components worn or mis-adjusted • Restricted exhaust
• Restricted air filter (main or pre-
• Vehicle not reaching operating
• Fuel quality poor (old) or octane cleaner) or breather system
too high temperature (Short tripping)
• Improperly assembled air intake
system

ENGINE TURNS OVER BUT FAILS TO START

• No fuel • Fuel pump inoperative/restricted • Low compression (high cylinder
leakage)
• Dirt in fuel line or filter • Tank vent plugged or pinched
• No spark (Spark plug fouled)
• Fuel will not pass through fuel • Engine flooded ignition component failure
valve
• Injector control circuit failure • Intake leak / vacuum leak
• Clogged / Failed Fuel Injector

ENGINE DOES NOT TURN OVER

• Battery, Starter, and Ground Cable • Starter motor does not turn • Dead battery
Connections
• Starting system circuit concern
• Engine seized, rusted, or (blown fuse / failed relay /
mechanical failure damaged wiring)

ENGINE RUNS BUT WILL NOT IDLE

• Restricted fuel supply • Low compression • Throttle Body (installed incorrect /
electrical concern / failed)
• Intake leak / vacuum leak • TPS (installed incorrect / electrical
concern / failed sensor) • Crankcase breather restricted

ENGINE IDLES BUT WILL NOT ACCELERATE

• Spark plug fouled/weak spark • Air box removed (reinstall all • Cam worn excessively
intake components)
• Broken throttle cable • Restricted exhaust system
• Incorrect ignition timing
• Obstruction in air intake • Low fuel pressure
• Throttle Body

9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual 1.35
© Copyright Polaris Industries Inc.