What can cause surging on a Briggs and Stratton motor?

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 Briggs engine to surge?

A dirty or gummed up carburetor causes an engine to surge. If you feel comfortable working on carburetors, unbolt the bowl and clean it thoroughly. Check whether the float moves up and down without sticking, and clean the tiny ports on the bowl hold-down bolt.

What causes a lawnmower engine to surge up and down?

Airflow Issues

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.

Can bad 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.

Why does my Briggs and Stratton lawn mower 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.

How To FIX A SURGING ENGINE On A Lawn Mower, Pressure Washer, etc.

How do you fix a surging governor?

Over time the spring can stretch out, causing the same engine surging. Often surging caused by the governor can be fixed by simply adjusting the governor spring. It usually only takes a small adjustment to correct the surging. If the spring has stretched out it will need to be replaced.

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.

What causes an engine to hunt and surge?

Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburettor, adjustment of the governor, and/or changing the air filer may be required.

Why is my Briggs and Stratton sputtering?

Your riding mower can sputter due to using a bad batch of fuel in the tank, a damaged gas cap, clogged air filters, excess grass under the deck, a damaged spark plug, a clogged carburetor, or water in the fuel tank. These factors tend to cause your mower to lose power, leading to sputtering.

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 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. When fuel injectors grant an extra force to the filters, it can cause the pressure to spike up.

Can a bad fuel pump cause surging?

Irregular resistance inside the fuel pump motor may cause vehicle surging, and indicates a fuel pump in need of repair. Surging feels like the gas pedal has been used. However, it occurs at a random, consistent speed. If this happens often, it may be because of problems within the fuel pump.

What are signs of a bad ignition coil?

Is engine surging bad?

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. Since a vehicle's ignition wires and spark plugs play a major role in proper engine performance, it is likely time to check your engine's electrical components ...

What causes idling to go up and down?

If you're noticing that your RPMs are constantly going up and down, even when you're not accelerating, it's likely that you have a bad idle air control valve. The best way to determine if your idle air control valve is the issue is to check engine light.

What does surging idle mean?

Copyright AA1Car. If a vehicle idles erratically and surges (idle speed is not steady and increases and decreases), the problem may be a buildup of carbon or fuel varnish deposits in the idle speed control valve (also called the idle air control valve or IAC valve).