9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
1.29
ENGINE TROUBLESHOOTING
SPARK PLUG FOULING
• Spark plug cap loose or faulty
• Incorrect spark plug heat range or
gap
• PVT system calibrated incorrectly/
components worn or mis-adjusted
• Fuel quality poor (old) or octane
too high
• Improperly assembled air intake
system
• Injector Spray Pattern
• High Leakdown
• Valvetrain / Valve Clearances
• Restricted exhaust
• Vehicle not reaching operating
temperature (Short tripping)
• Oil contaminated with fuel
• Weak ignition (loose coil ground,
faulty coil, or stator)
• Restricted engine breather system
• Restricted air filter (main or pre-
cleaner) or breather system
ENGINE TURNS OVER BUT FAILS TO START
• No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel
valve
• Clogged / Failed Fuel Injector
• Fuel pump inoperative/restricted
• Tank vent plugged or pinched
• Engine flooded
• Injector control circuit failure
• Low compression (high cylinder
leakage)
• No spark (Spark plug fouled)
ignition component failure
• Intake leak / vacuum leak
ENGINE DOES NOT TURN OVER
• Battery, Starter, and Ground Cable
Connections
• Engine seized, rusted, or
mechanical failure
• Starter motor does not turn
• Starting system circuit concern
(blown fuse / failed relay /
damaged wiring)
• Dead battery
ENGINE RUNS BUT WILL NOT IDLE
• Restricted fuel supply
• Intake leak / vacuum leak
• Low compression
• TPS (installed incorrect / electrical
concern / failed sensor)
• Throttle Body (installed incorrect /
electrical concern / failed)
• Crankcase breather restricted
ENGINE IDLES BUT WILL NOT ACCELERATE
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all
intake components)
• Incorrect ignition timing
• Throttle Body
• Cam worn excessively
• Restricted exhaust system
• Low fuel pressure
GENERAL INFORMATION
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