Asked by: Restituta Lobb
home and garden home appliances

Why is my Husqvarna lawn mower surging?

Last Updated: 16th May, 2021

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Problems in the Fuel System
Since the hole is so small, it can plug up with dust or dirt during normal mowing operations. Check and clean the vent. Surging is also caused by water that got into the fuel. Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline.

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Consequently, why is my Briggs and Stratton surging?

The Surging Test As you know, gas starvation causes an inconsistent flow of fuel which in turn causes erratic running. And, you also know a vacuum leak will cause erratic running, but is a much less common cause. To quickly diagnose which problem you have, follow this simple test.

One may also ask, what causes a lawn mower engine to sputter? Your mower pulls in air from outside and mixes it with gasoline for the proper explosion inside the engine. A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine.

Similarly, you may ask, what causes engine surging?

If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.

What causes lawn mower to rev 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.

Related Question Answers

Secundino Fornari

Professional

How do you adjust the governor on a Briggs and Stratton engine?

First, loosen the arm until it is moving freely. Next, open the throttle to full capacity while making a note of which direction the arm moves in when the throttle moves through it. Once the throttle is fully opened, move the governor shaft in the same direction the governor arm traveled.

Aimee Congiu

Explainer

What causes a carbureted engine to surge?

Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge.

Juraj Sims

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What causes an engine to hunt and surge?

A surge is usually caused by a fuel system management or drivetrain operation failure. When an engine's computer can "hunt" or "surge" at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.

Veneta Carneado

Explainer

What causes backfiring in small engines?

Small engines, like any other engine, backfire most likely due to ignition timing issues, or fuel not being fully burned during normal combustion. I would first make sure the engine' fuel mixture is not set too rich, and that the spark plug is properly gapped, not fouled and is producing a consistent spark.

Luana Neimeier

Pundit

How do you clean a Briggs and Stratton carburetor?

How to Clean & Repair Carburetors on Briggs & Stratton Small Engines
  1. Check the air-flow to the carburetor.
  2. Clean the air filter with a shop vacuum or replace it with a new one.
  3. Remove the fuel line from the fuel tank and look for blockages in the line.
  4. Remove the spark plug and inspect the plug for charring or moisture.

Isis Daryapurkar

Pundit

What does engine surging feel like?

A wide variety of issues can prompt an engine surge. The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc.

Mazen Dong

Pundit

Can bad spark plugs cause surging?

It may suddenly surge in power, then slow down. The engine is sucking in more air than it should be in its combustion process, causing the delay in power delivery. The combined hesitation and surging could indicate a spark plug problem.

Ali Dempsey

Pundit

Can spark plugs cause surging?

Bad Plugs Can Cause a Misfire
Each cylinder has a spark plug and a piston. The electrical voltage needed for combustion varies with different spark plugs. Intense heat causes the electrons following through the ignition system to jump the plug's gap and ignite the fuel mixture.

Ada Majada

Teacher

Why does my rpms jump up and down while idling?

A failed/problematic IAC can cause engine stalling when off-throttle, and/or excessively high engine rpm, particularly at idle. This may be an indication that the ECU recognizes an air leak and is trying to lower idle speed by closing the idle air bypass circuit. The IAC valve is prone to carbon buildup.

Marin Bouchet

Teacher

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.

Nazik Pfafferodt

Teacher

What causes RPM to fluctuate while idling?

When the engine is warmed up, I notice that the RPM needle varies from 700 to 900rpm. Erratic engine idle can be caused by various factors, but the most common and likely cause is a dirty or malfunctioning Mass Air Flow (MAF) sensor.

Acisclo Undiano

Teacher

What causes a car to sputter and idle rough?

The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. A rough idle is one symptom of a clogged fuel filter.

Onan Sagardoy

Beginner

What causes lawn mower to rev up and down?

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. To fix this type of problem, check the air filter to ensure that it's not clogged with dirt and debris.

Adahi Krichevsky

Beginner

Why is my lawn mower engine popping?

A spark plug that is damaged, worn, or has an improperly set gap between its electrodes creates a weak spark. As a result, the fuel may not ignite in the cylinder, but it might ignite when it reaches the hot exhaust muffler. The result is a loud backfire. Poor spark also results in a mower that runs unreliably.

Falak Warstat

Beginner

Why does my lawn mower only run for a few seconds then dies?

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner.

Anica Kerstens

Beginner

How do I fix my lawn mower from sputtering?

How to Fix a Sputtering Lawnmower
  1. Remove the cap of the gas tank and look in at the gas. Inspect the gas for signs of water.
  2. Turn the mower over so the oil case is sitting under the carburetor. Set a drain pan under the oil plug.
  3. Remove the screw holding the air filter cover in place.
  4. Check the underside of the unit for caked on grass.

Neide Blumenthal

Beginner

Why does my lawn mower run sluggish?

Because a lawn mower is powered by a combustion engine that is powered by liquid fuel, clogging is a major issue that slows down or even shuts down performance. In fact clogging can occur in many areas of the lawn mower, including the fuel line, the gas cap, the carburetor, the "needle and seat" and the air filter.

Dragos Nadel

Beginner

How do you clean a carburetor on a lawn mower without removing it?

How to clean a carburetor on a lawn mower without removing it: step by step
  1. What Tools Do You Need?
  2. Step #1: Assess the Situation.
  3. Step #2: Expose the Insider Part of the Carburetor.
  4. Step #3: Spray the Aerosol Cleaner.
  5. Step #4: Remove the Deposits.
  6. Step #5: Replace the Carburetor Cover and Linkage.