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Polaris 2003 MSX Engine Runs Irregularly, Stalls or Misfires, Possible Weak Spark Cause Solution

Models: 2003 MSX

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		ENGINE TROUBLESHOOTING
	Engine Runs Irregularly, Stalls or Misfires

	Possible Weak Spark Cause	Solution

	Fouled or defective spark plugs	Inspect, clean and/or replace spark plugs

	Worn or defective spark plug wires	See your Polaris dealer

	Incorrect spark plug gap or heat range	Set gap to specs or replace plugs

	Loose spark plug connections	Check all connections and tighten

	Water present in fuel	Replace with new fuel

	Clogged exhaust pipe screen fitting	Clean screen fitting

	Water in exhaust pipe	Drain exhaust

	Low battery voltage	Recharge battery to 12.5 VDC

	Possible Lean Fuel Mixture Cause	Solution
	Possible Lean Fuel Mixture Cause	Solution

	Low or contaminated fuel	Add or change fuel, clean the fuel system

	Low octane fuel	Replace with recommended fuel

	Clogged fuel filter	See your Polaris dealer

	Possible Rich Fuel Mixture Cause	Solution
	Possible Rich Fuel Mixture Cause	Solution

	Fuel is very high octane	Replace with lower octane recommended fuel

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Polaris 2003 MSX owner manual Engine Runs Irregularly, Stalls or Misfires, Possible Weak Spark Cause Solution

Contents

MSX Page We’ve created a web site, just for YOU Page Welcome Polaris Recreational VehiclesPolaris Professional Series Workmobilest Table of Contents Do Your Part Your Responsibilities Age Restrictions Maintenance Requirements Identification Numbers Signal Words and Symbols Safety Safety Decals Safety To Avoid Collisions Righting Capsized Boat Located on the engine water manifold Informational Decals Operator Guidelines Operator Safety Safety Suit/Shoes/Gloves Safe Riding GearPersonal Floatation Device Eye Protection Overloading the Watercraft Fire Safety Protective Apparel Weather and Darkness Obstacles and Shallow Water Service and Maintenance Turning and AcceleratingPre-Operation Check Lifting the Watercraft Jet Pump Water Intake SafetyElectrical Shock Hazard Safe Riding Position Operator Awareness Operator FitnessBoating Under the Influence To avoid hypothermia Vehicle ModificationsOperator Fatigue and Dehydration Hypothermia Exhaust Outlet Reverse Gate Features and Controls 911 Reverse Operation Handle Features and Controls Engine Components under seat Engine Components Accessible Functions New Generation Instrument NGIPrimary Functions Function Overview Instrument Operation Display Mode Check Engine Display Warnings RPM Limiter Accessories Standard EquipmentOptional Equipment Emissions EPA Emissions RegulationsCalifornia Star Labels One Star Low Emission Two Stars Very Low EmissionThree Stars Ultra Low Emission Pre-Operation Inspection Operation What To Do Fuel Refueling Oil Ride Plate Impeller Drive Shaft Jet Pump Intake Steering ThrottleEngine and Storage Compartments Loose Parts SeatFire Extinguisher Battery Hull Drain Plugs and BilgeRiding Gear Switches/Buttons Principles of Operation Engine Break-in Procedure Operation Give-way Vessel Navigational RulesRight-of-way and Give-way Stand-on Vessel Rule Encountering VesselsMeeting Vessels Crossing Paths Overtaking Vessels Fishing Vessel Right-of-Way Non-Motorized Craft Avoid Collisions Reading Buoys and MarkersLaunch Ramp Etiquette Stopping the Engine Launching the Watercraft Starting the Engine Before Starting the Engine If the Engine Doesn’t Start Boarding and Starting in Deep Water Operator Only Boarding the Watercraft Boarding With a Passenger Turning the Watercraft Reverse Operation Stopping the Watercraft Beaching the Watercraft Operating in Rough Conditions Towing a Disabled Watercraft Righting a Capsized Watercraft Operating With Passengers Daily Care Post Operation Maintenance Operation Temporary Storage Transporting The Watercraft Submerged Waterlogged Engine Anti-Corrosion Treatment Engine Water Removal Procedure General Maintenance Maintenance and Lubrication Maintenance Schedule Key Periodic Maintenance Schedule Description Fuel System Hull / Deck / Steering / Controls Drive Line Steering Cable Joints and Inner WireLubrication Throttle Cable Steering Handle Pivot Shaft Seat Latch And Hooks Steering Nozzle Pivot ShaftThrottle Body And Oil Injection Pump Electrical Connections Spark Plugs Maintenance and Lubrication Hull and Deck Care Polaris Nature Oil Synthetic Lubricant OilPolaris VES II Synthetic Lubricant Polaris Premium Gold Synthetic Lubricant Steering Cable Inspection FusesThrottle Cable Inspection Antidote BatteryBattery Maintenance and Charging Replenishing Battery Fluid Battery Removal Battery Charging Battery Storage Battery Installation Jet Pump Water Inlet Screen Salt Water and Unclean Water Care Cooling System Flushing Engine and Exhaust System Draining Extended Storage Watercraft Engine Fogging Procedure Cleaning Lubrication Engine Troubleshooting Engine Doesn’t Turn OverEngine Turns Over But Doesn’t Start Engine Runs Irregularly, Stalls or Misfires Possible Weak Spark Cause Solution Engine Backfires Engine Overheats Engine Pings or Knocks Engine Loses Power Unusual Noise or Vibration From Propulsion System Engine RPM is Too High With Limited Speed Oil and Lubricants Polaris Products Capacities / Dimensions Specifications Propulsion Obtaining Service and Warranty Assistance Warranty Warranty Policy Engine Oil HOW to Obtain Warranty Service Polaris Watercraft Engines California Emission Control System Limited Warranty OWNER’S Warranty Responsibilities 109 Emissions Index 111