Polaris ACE 150 EFI (2018 year). Manual - part 25

104

TROUBLESHOOTING

Engine Doesn't Turn Over

Engine Turns Over, Fails to Start

Engine Backfires

Possible Cause

Solution

Low battery voltage

Recharge the battery to 12.8 VDC

Loose battery connections

Check all connections and tighten

Loose solenoid connections

Check all connections and tighten

Possible Cause

Solution

Out of fuel

Refuel

Water is present in fuel

Drain the fuel system and refuel

Old/non-recommended fuel

Replace with fresh recommended fuel

Fouled/defective spark plug

Inspect plug and replace if necessary

No spark to spark plug

Inspect plug and replace if necessary

Water or fuel in crankcase

Your POLARIS dealer can assist.

Clogged fuel filter

Your POLARIS dealer can assist.

Low battery voltage

Recharge the battery to 12.8 VDC

Mechanical failure

Your POLARIS dealer can assist.

Possible Cause

Solution

Weak spark from spark plug

Inspect, clean and/or replace spark plug

Incorrect spark plug gap or heat 

range

Set gap to specs or replace plug

Old/non-recommended fuel

Replace with fresh recommended fuel

Incorrectly installed spark plug 

wires

Your POLARIS dealer can assist.

Incorrect ignition timing

Your POLARIS dealer can assist.

Mechanical failure

Your POLARIS dealer can assist.

Loose ignition connection

Check all connections and tighten

Water present in fuel

Replace with fresh recommended fuel

Exhaust system leak

Your POLARIS dealer can assist.

105

TROUBLESHOOTING

Engine Pings or Knocks

Engine Runs Irregularly, Stalls or Misfires

Possible Cause

Solution

Poor quality or low octane fuel

Replace with recommended fuel

Incorrect ignition timing

Your POLARIS dealer can assist.

Incorrect spark plug gap/heat range

Set gap to specs or replace plug

Possible Cause

Solution

Fouled or defective spark plug

Inspect/clean/replace spark plug

Worn or defective spark plug wires

Your POLARIS dealer can assist.

Incorrect spark plug gap/heat range

Set gap to specs or replace plug

Loose ignition connections

Check all connections and tighten

Water present in fuel

Replace with new fuel

Low battery voltage

Recharge battery to 12.8 VDC

Kinked/plugged fuel tank vent line

Inspect and replace

Incorrect fuel

Replace with recommended fuel

Clogged air filter

Inspect and clean or replace

ETC malfunction

Your POLARIS dealer can assist.

Other mechanical failure

Your POLARIS dealer can assist.

Possible Lean Fuel Cause

Solution

Low or contaminated fuel

Add/change fuel, clean fuel system

Low octane fuel

Replace with recommended fuel

Clogged fuel filter

Your POLARIS dealer can assist.

Incorrect fuel

Replace with recommended fuel

Possible Rich Fuel Cause

Solution

Fuel is very high octane

Replace with lower octane fuel

Stopping/starting without adequate 

warm-up

Allow engine to warm up before 

operating and/or stopping

Incorrect fuel

Replace with recommended fuel

Clogged air filter

Inspect and clean or replace

106

TROUBLESHOOTING

Engine Stops or Loses Power

Possible Cause

Solution

Out of fuel

Refuel

Kinked or plugged fuel vent line

Inspect and replace

Water is present in fuel

Replace with new fuel

Fouled or defective spark plug

Inspect, clean and/or replace spark plug

Worn or defective spark plug wires

Your POLARIS dealer can assist.

Incorrect spark plug gap or heat range

Set gap to specs or replace plug

Loose ignition connections

Check all connections and tighten

Low battery voltage

Recharge the battery to 12.8 VDC

Incorrect fuel

Replace with fresh recommended fuel

Clogged air filter

Inspect and clean or replace

Electronic throttle control malfunction

Your POLARIS dealer can assist.

Other mechanical failure

Your POLARIS dealer can assist.

107

WARRANTY

LIMITED WARRANTY

POLARIS Industries Inc., 2100 Highway 55, Medina, MN 55340 (POLARIS) gives a 

SIX MONTH LIMITED WARRANTY on all components of your POLARIS vehicle 

against defects in material or workmanship. POLARIS further warrants that the spark 

arrester in this product will meet the efficiency requirements of USFS standard 5100-

1C for at least 1000 hours when subjected to normal use and when maintenance and 

installation are in accordance with POLARIS recommendations.
This warranty covers parts and labor charges for repair or replacement of defective 

parts and begins on the date of purchase by the original retail purchaser. This warranty 

is transferable to another owner during the warranty period through a POLARIS 

dealer, but any such transfer will not extend the original term of the warranty. The 

duration of this warranty may vary by international region based upon local laws and 

regulations.

Registration

At the time of sale, the Warranty Registration Form must be completed by your dealer 

and submitted to POLARIS within ten days of purchase. Upon receipt of this 

registration, POLARIS will record the registration for warranty. No verification of 

registration will be sent to the purchaser as the copy of the Warranty Registration 

Form will be your proof of warranty coverage. If you have not signed the original 

registration and received the customer copy, please contact your dealer immediately. 

NO WARRANTY COVERAGE WILL BE ALLOWED UNLESS YOUR VEHICLE 

IS REGISTERED WITH POLARIS. Initial dealer preparation and set-up of your 

vehicle is very important in ensuring trouble-free operation. Purchasing a machine in 

the crate or without proper dealer set-up will void your warranty coverage.

Warranty Coverage And Exclusions:

Limitations Of Warranties And Remedies

This POLARIS limited warranty excludes any failures that are not caused by a defect 

in material or workmanship. THIS WARRANTY DOES NOT COVER CLAIMS OF 

DEFECTIVE DESIGN. This warranty also does not cover acts of God, accidental 

damage, normal wear and tear, abuse or improper handling. This warranty also does 

not cover any vehicle, component, or part that has been altered structurally, modified, 

neglected, improperly maintained or used for racing, competition or purposes other 

than for which it was designed. 
This warranty excludes damages or failures resulting from improper lubrication; 

improper engine timing; improper fuel; surface imperfections caused by external 

stress, heat, cold or contamination; operator error or abuse; improper component 

alignment, tension, adjustment or altitude compensation; snow, water, dirt or other 

foreign substance ingestion/contamination; improper maintenance; modified 

components; use of aftermarket or unapproved components, accessories, or 

attachments; unauthorized repairs; or repairs made after the warranty period expires or 

by an unauthorized repair center.