Question: What Causes A Lawn Mower Not To Start?

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

It could be from a dirty carburetor, a malfunctioning spark plug, insufficient flow of gas to the engine or a clogged air filter.

But if your lawn mower starts then dies, the causes could also be the same.

The most common cause of why a lawn mower starts then dies can be due to a carburetor problem..

What causes a lawn mower engine to miss?

The spark plug ignites the fuel in the combustion chamber once it has been compressed. If the spark plug is no longer firing, or corroded with residue and cannot produce a strong enough current to properly spark the fuel, the engine may misfire or completely stop running altogether.

What happens if you leave gas in lawnmower over winter?

Unused gas left in a mower over the winter can get stale, gumming up the carburetor and inviting rust. First, add fuel stabilizer to the tank, then run the mower to distribute it through the system. Turn the mower off and allow the engine to cool, then siphon excess gas into a clean can.

How do I know if my lawn mower carburetor is bad?

Here are four telltale signs that your carburetor needs attention.It just won’t start. If your engine turns over or cranks, but doesn’t start, it could be due to a dirty carburetor. … It’s running lean. An engine “runs lean” when the balance of fuel and air gets thrown off. … It’s running rich. … It’s flooded.

How do I fix my lawn mower surging?

Clogged Air FilterFirst, disconnect the spark plug wire. … Remove the air filter and its housing.Use soapy water to clean a foam filter. … On the contrary, if you have a paper filter and it’s too dirty for you to even see light through it, replace it with a new filter that’s designed for your lawn mower model.More items…

How do you start a lawn mower after winter?

To get the mower started, you may have to change the gas and clean or change the plug.Check the oil before you start a four-cycle mower that has been sitting for a long time. … Prime the engine by pushing the priming bulb three times. … Give the spark plug wire a little tug to see if it’s loose.More items…

Will a bad spark plug cause a lawn mower not to start?

A dirty or fouled spark plug can cause your lawn mower to not start. It can also work itself loose, causing issues. If the spark plug appears to be seated correctly but the engine doesn’t start, a new one may be in order. For a few dollars, this easy fix can get your small engine working again.

Can old gas cause a lawn mower not to start?

Linda Cottin. If your mower is hesitating, sputtering or simply won’t start, there is a good chance bad gas is the problem. Volatile compounds allow gas to burn. As these compounds evaporate, gas becomes less combustible and eventually turns into a gummy, varnishlike substance.

Why does my lawn mower sound like it is surging?

This vent is just large enough to allow air into the tank, creating enough backpressure to aid in fuel delivery to the carburetor. … 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.

What causes a riding lawn mower not to start?

There are numerous explanations for why a riding lawn mower won’t start, including everything from bad gas or a bad battery to a failed starter motor or lawn mower ignition switch problems. … A dead battery, bad starter solenoid, failed starter motor or a seized engine could be the cause.