Garden

I have an Ariens snowblower with an 11 horse B & S C/ I engine that runs ok for about 1/2 hour or so and then begins to pulsate while idling; it revs up and then down constantly, but runs smooth when working throwing snow. Thanks
Experienced gardeners share their insights in answering this question :
This i what my pressure washer does… I would say its just getting aged and you shouldnt have to worry about it, but if you want to try to get it to stop then give it a good tune up. spark plug air filter and clean the carb out with a small wire or tourch tip cleaner to make sure all the passages are clean and clear… or just let it keep doing it like I do.

How to Identify and Fix Common Gardening Problems ?

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It is normal for a snow thrower engine to run in this manner. The engines on snow throwers are set to run with a slightly rich fuel mixture. This is to prevent the engine from bogging or stalling when the snow thrower suddenly experiences a heavy load of snow.
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.
If the snowblower engine RPMs are surging up and down, check the following parts for damage: springs, gasket, carburetor, and spark plug. We can help fix your problem with our repair guide. Before you work or check on any parts in your snowblower, make sure to unplug the spark plug and empty the fuel tank for safety.
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.
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.

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.
When your snowblower engine only runs for a few seconds and then dies, the problem is often caused by a gummed-up carburetor. The carburetor mixes air with fuel in the proper proportion to produce a combustible gas.
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.
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.

Poor Engine Performance

Under heavy loads, a clogged fuel filter may cause the engine to randomly hesitate, surge or sputter. This tends to be more prominent when accelerating, especially up a steep incline.

This is caused by a rich/lean cycle at idle. As the motor leans out the RPM`s increase and richen up the motor, when the motor richens the RPM`s decrease and the motor leans out again. This continual cycle is known as “blower surge”.
A clogged carburetor is most commonly caused by leaving fuel in the snowblower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
The easiest way to diagnose gas is to smell the fuel in question. Oxidized gas has a sour smell and is much stronger smelling than fresh gas. The other method is to drain a sample from your machine`s fuel tank or your gas can into a clear glass container. If the gas is dark in color, it has more than likely gone bad.

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