12SECTION 8: TROUBLESHOOTINGTrouble Possible Cause(s) Corrective ActionEngine fails to start Dirty air cleanerEngine needs to be primedFuel tank emptyStale fuel in gasoline tankThrottle lever not in FASTSpark plug wire disconnected.Spark plug fauledEngine floodedRefer to the engine manual packed with your unit.Push primer bulb two or three times.Fill tank with clean, fresh gasoline.Drain gasoline and refill tank with clean, fresh gasoline.Move throttle lever to FAST (rabbit) position.Connect the spark plug wire to the spark plug.Clean, adjust gap or replace spark plug.Refer to the engine manual packed with your unit.Engine runs erratic Spark plug wire looseStale fuel in gasoline tankVent in gas cap pluggedWater or dirt in fuel systemDirty air cleanerCarburetor out of adjustmentConnect and tighten spark plug wire.Drain gasoline and refill tank with clean, fresh gasoline.Clear vent of any debris.Drain fuel tank. Refill with fresh fuel.Refer to the engine manual packed with your unit.Refer to the engine manual packed with your unit.Engine overheats Engine oil level lowAir flow restrictedDirty air filterCarburetor not adjusted properlyFill crankcase with proper oil.Clean grass from around the engine’s cooling fins.Replace the engine’s air filter.Refer to the engine manual packed with your unit.Excessive vibration Edger blade bent or damagedBlade spindle bent or damagedReplace edger blade.Contact an authorized MTD service dealer.Drive belt slips Belt worn or stretched Replace drive belt.