Problems in the Fuel System The cap on your mower’s gas tank is vented with a small hole Surging is also caused by water that got into the fuel A mower left in a heavy rain or condensation on a hot summer day can choke the engine Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline
What causes a lawn mower engine to rev up and down?
A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down When the blockage moves or clears, the engine may suddenly rev up in response
What causes riding mower engine to surge?
The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas Bad spark plug Dirty / faulty carburetor
What causes a carbureted engine to surge?
Incorrect fuel mixture adjustments and engine idling capabilities can be upset by fuel mixture adjustments and fuel vapor recovery system malfunction The fuel system cleaner added to the fuel tank can open blocked passages in the fuel system that could be causing the surge
Why is my lawn mower chugging?
Clogged or Dirty Air Filters Dirty air filters are one of the most common reasons lawn mowers sputter Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber You want to be sure to clean or replace dirty air filters
How do I stop my lawn mower from surging?
A thin coating of engine oil on foam filters typically helps them attract dirt that could end up in your carburetor Paper filters, however, only use their pleated medium to catch dirt and dust An air filter is a quick fix that should be your first stop when troubleshooting a surging lawn mower
How do I fix my lawn mower from sputtering?
How to Fix a Sputtering Lawnmower Remove the cap of the gas tank and look in at the gas Inspect the gas for signs of water Turn the mower over so the oil case is sitting under the carburetor Remove the screw holding the air filter cover in place Check the underside of the unit for caked on grass
Why is my Toro lawn mower surging?
Surging is always caused by a weak air:fuel ratio This can be due to a lack of fuel ( blockage ) or excess air ( leak at manifold ) Actually cleaning / replacing the air filter usually makes surging worse You can start at either the carb or the fuel tank and check for obstructions
How do you fix a surging idle?
Start the engine, then increase and hold the idle speed to 1,000 to 1,500 rpm Turn the engine off to allow the cleaner to soak into the IAC passageway Restart the engine, rev and hold at 1,000 to 1,500 rpm, and repeat the cleaning process again
Where is the air filter on a lawn mower?
A lawn mower’s air filter is usually located near the top of the engine and is encased within a metal or plastic shroud that is usually secured by a screw or with snap fittings
Can spark plugs cause surging?
3 Surging and Lagging Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed
Can faulty oxygen sensor cause engine surging?
Oxygen sensors are among the most interesting and important sensors on your engine Surging is among the many problems a failing O2 sensor can cause, but it isn’t the only one
Can dirty air filter Cause Surge?
In other words, if you have a bad air filter, then don’t be surprised if you have trouble accelerating as you step on the gas pedal The engine will not respond well to dirty air in its chamber This means it will have trouble generating enough power to accelerate the vehicle to the speed that you want
Why is my lawn mower pushing hard?
The most likely reason a mower is hard to push is that the drive cable needs adjustment Other possible causes include: Worn drive belt Damaged pulley
Why is my lawn mower not running smoothly?
A dirty air filter is one of the most common causes of a poorly running lawn mower, since it starves the engine of the oxygen needed for combustion Fuel Filter: Check the fuel filter on the mower to make sure it’s clean, and replace it if needed
Can a spark plug cause a lawn mower to sputter?
Cause: a dirty or bad spark plug can make your lawn mower difficult to start; it can also cause the sputter engine Although a dirty or damaged spark plug is not a major cause of a sputtering engine, it may just be the cause of your mower sputtering
How do I know if my lawnmower spark plug is bad?
The spark plug in a lawn mower could be bad if: You can’t get the engine to fire up at all You have to tug extra hard for longer than usual on the rewind Your lawn mower loses power while moving The gas runs out quicker than it used to
Why does my riding mower runs wide open?
Usually an engine running WFO will be either an air leak between the carb and the engine Or a failure of the governor Two most common govenor failures, broken connection spring or loose connection at the govenor shaft After that it is on with the scuba gear and some diving deep inside the engine
What does a governor spring do?
The governor spring wants to open the throttle and the governor tries to close the throttle The interaction of the governor spring and mechanical governor holds the throttle at the desired engine rpms based upon a force balance and the load / operating conditions
How do I get more power out of my lawn mower engine?
How to Get More HP Out of a Lawn Mower Engine Remove the flywheel housing from the top of your engine Unscrew the bolt holding the governor flap next to the flywheel with the proper sized wrench Inspect the muffler Fill the gas tank on your mower with a high octane gas Maximize the air flow