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 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
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
Why is lawn mower revving up and down?
A carburetor that’s incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself One screw controls the idle speed while the other adjusts the idle mixture
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
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
How do you fix an idle surge?
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
Why is my engine revving in park?
The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate A vacuum leak, sensor that has failed, or an EGR system malfunction could potentially be the cause of the erratic engine you’re experiencing
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
Where is air filter on 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
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
What is the governor on a lawn mower?
The governor system is like a cruise control system It maintains the speed of your lawn mower or outdoor power products When Briggs & Stratton governors are adjusted properly, they keep your speed steady regardless of engine load – the amount of work the engine must perform
Can a bad fuel filter cause surging?
Clogged Fuel Filter Clogged filters cause surging because they reduce fuel pressure In other words, the fuel injectors need to open to keep the amount flowing steadily This brings the pressure down again To avoid this sort of pressure drop and spikes, you should check your fuel filter from time to time
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
How do you adjust the governor on a riding lawn mower?
To adjust the governor, you would loosen the screw on the bottom of the governor arm and push the governor arm so the throttle is wide open Then you would turn the bottom “clip” (which is connected to the governor shaft) counter clockwise This will set the governor shaft on top of the governor spool
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
How do you fix a lawn mower sputter?
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 Set a drain pan under the oil plug Check the underside of the unit for caked on grass Excessive grass under the deck will make the mower sputter
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
Can bad coil cause surging?
Engine Surging Can Be an Early Warning Sign of Ignition Problems Engine surging is usually a warning sign that your car or truck is having combustion problems Each spark plug delivers current from the ignition coil via your vehicles spark plug wires to an individual cylinder’s combustion chamber
Can a bad 02 sensor cause 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
How do I know if my spark plug is misfiring?
Symptoms of misfiring spark plugs include rough idling, uneven power when accelerating, and an increase in exhaust emissions