Bilt 22HP Hydrostatic 46″ Riding Mower

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

If your lawnmower`s engine is surging it could be a problem with the carburetor. The carburetor mixes air and fuel to the perfect ratio for combustion. There are passages and nozzles (called jets) that route the fuel through the carburetor. The jets meter the precise amount of fuel that is needed for combustion.
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.
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.
What Is Engine Surge? Basically, when an engine surges, you notice your car speeding up and slowing down even while you keep the accelerator steady. You may notice the tachometer fluctuating, for example, from 1500 to 2000 rpm. At the same time, you may feel a soft and rhythmic jerking motion.
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.
The mower surges when the carburetor sucks air through an unsealed gap in the air intake manifold instead of through the air filter. Dirty carburetor. Clogged fuel jets inside the carburetor commonly cause the lawn mower engine to surge. Clogged jets can`t provide the right mix of air and fuel to the engine.
Stalling, surging, or hesitating while idling all can be caused by this unassuming sensor. The best way to determine if these issues are caused by your throttle position sensor is to go to the source. By using a multimeter, you can determine if the sensor has an electrical connection issue.
This is usually caused by air interruptions in the exhaust system`s intake manifold. Such a leak could bring about lower fuel efficiency and a hissing sound, make the check engine light come on, cause power loss and stalling, or high or fluctuating RPM.
A bad spark plug could also cause misfiring, surging, or hesitating. Engine misfiring could be caused by a damaged spark plug tip. Engine surging or hesitating could be from the over intake of air into the engine, indicating a potential spark plug issue.
When a lawn mower surges, it sounds as if the engine reaches full speed, only to decelerate quickly. Typically, it doesn`t die, but the surging may repeat during the entire time the mower is in use. Like other small engines, mowers rely on a precise volume of gasoline and air for smooth operations.
There are several reasons that surging occurs. A restriction to flow or fouling in the air/gas system is one possible factor. This could be caused by a dirty charge air cooler, or dirt or contamination on a nozzle ring, for example.
Surge can be prevented by providing an anti-surge valve, which allows more flow to be recycled back to the suction side and enables moving the compressor operating point away from the surge line.
A pulley that is binding will cause the lawn tractor to jerk forward. To check for a binding pulley, start by disconnecting your battery, and remember to start with the negative cable first. Now you can remove your mower deck. Remove your drive belt and check the inside condition of the pulleys.
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn`t work, you might need a new fuel filter.
Why does hunting happen? The most common cause for engine hunting is a blockage in the carburettor. Put simply, this restricts the fuel flow in the carburettor causing the engine to slow down. To try to compensate for this, the engine`s governor opens the throttle to allow more fuel into the engine.
To control engine speed, a mechanical governor uses gears and flyweights inside the crankcase to detect changes in the load and adjusts the throttle accordingly.
How to fix it? Cleaning or replacing the fuel filter and adding a fuel injector cleaning treatment to the fuel tank should take care of clogged fuel injectors. If the rough idle persists, it`s time to take your car to an auto repair shop.
Problem Description

Bad throttle position sensors can cause high idle without causing the Check Engine Light to illuminate.

The idle speed should feel consistent without skipping or slipping. In most of today`s cars, an idle speed of 600 to 1000 RPMs is average. If your car is idling rough, though, it won`t feel smooth. The RPMs will jump up and down, for example, or they`ll fall below 600 RPM (or whatever is typical for your vehicle).
Engine Surging

In most cases, a faulty fuel pump will not draw enough fuel out of the tank. In some cases, it will draw too much fuel out of the tank and your engine will surge sporadically as you drive your automobile. You will continue to have this problem until you replace the fuel pump.

A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
Uneven idling and vibrations is a major warning sign that indicates faulty spark plugs. The car engine will run at lower RPM during idling and runs smoothly without any noticeable vibrations or sound. Failing spark plugs can result in the engine to become rougher and produce vibrations when left at idle speeds.
Spark plugs that are dirty or worn out should be replaced soon because they also cause a delayed throttle response. Oil residue can cause a weak or inconsistent spark. The weak spark that is released is not enough to accelerate.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

The engine surges at idle and then does not run constantly underpressure. sounds like fuel but cleaned all lines and used new fuel. any suggestions
ANSWER : A new spark plug and don,t forget to push in the choke after start.

Runs slow at full throttle runs slower than mid-throttle. Won’t deliver full power.
ANSWER : In California the new blowers have sealed mixture adjustments and you need the have your carb. mixture adjusted be a qualified shop. If your carb. HAS mixture adj., turn the high speed mixture so it runs best at high speed, then turn another 1/8 turn counter clockwise to be a little rich. Then at idle adj. the other screw till it idles best.

New husqvarne 42 inch 22v b&s eng .engine surges bad at idle ok in full throttle dealer says this is ok not buying that
ANSWER : Yes, this is ok…. i would suggest to have throttle cable adjusted. it may be set back to low.

I have A briggs & stratton 300 engine. When I start the motor surges at idle and full throttle.
ANSWER : Needs a new diaphragm between the carb. and tank…..cost about 2-3 dollars…(remember how it goes back on, you have a rubber piece and a firm gasket piece…the rubber piece mounts on top of the gas tank first, then the gasket piece on top, then the carb., then mount the carb. in with the five screws..(blow out all the ports when it is disasembled.)

Chainsaw runs fine than goes full throttle all by its self and cannot shut it off with switch.
ANSWER : Kill switch is broken or disconnected. Throttle linkage is broken or disconnected or idle is set way too high.

Seems to start easily run for a few minutes and then slow and stop–bulb remains full –gas is good–have tried half choke in case too lean–did not solve–also seems possibly related to the angle I hold it at–seems to cut out quicker if blower tube angled more downward.
ANSWER : Your filter may be hanging up in the tank. you also my be losing compression

Lawn scarifier motor runs slow than starts to smoke
ANSWER : What sort of scarifier is it?

My blower chugs while running. It idles fine but when the trigger is pulled it revs up to normal top speed then dies out and surges like this continuously. I have taken the blower a part and cleaned out the carburetor completely. Any tips would be helpful. Thanks!
ANSWER : Hi, Check the hose that supplies the carb with fuel. Sometimes even a small pinhole can cause this type of malfunction.
Good luck.