10
9929419 R02 - 2018-2019 RZR XP / XP 4 Turbo S Service Manual
© Copyright Polaris Industries Inc.
10.13
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
• 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
• Fuel pump inoperative/restricted
• Tank vent plugged or pinched
• Engine flooded
• Low compression (high cylinder
leakage)
• No spark (Spark plug fouled)
ignition component failure
Engine Does Not Turn Over
• Battery, Starter, and Ground Cable
Connections
• Engine seized, rusted, or
mechanical failure
• Starter motor does not turn
• Dead battery
Engine Runs But Will Not Idle
• Restricted fuel supply
• Low compression
• 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
• Cam worn excessively
• Restricted exhaust system
Engine Has Low Power
• Spark plug fouled
• Cylinder, piston, ring, or valve
wear or damage (check
compression)
• PVT not operating properly
• Cam worn excessively
• Restricted exhaust muffler
DIAGNOSTIC
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