Question by  redsol1 (35)

What steps are taken to troubleshoot lawn mowers that won't start?

My lawn mower's engine won't turn. The fuel tank is full and the oil levels are fine, but it won't start.


Answer by  Anonymous

Engine must be disengaged and can be rotated by hand, check battery(multi meter, battery charger), wires(look for breaks, bad connections), starter motor(if it has batt volts then bang on it with hammer, if no good, take apart and clean), clean the carburetor(with a kit), replace plugs, air and fuel filler,


Answer by  Latin4 (11170)

First thing I would do is change the spark plug and the filter. It needs to be serviced just like a car. Yearly maintenance should take care of any problems. One thing we do is, at the end of the season drain out all the gas, so water does not accumulatein the tank. Always refer to your manual.


Answer by  eyeguy (3760)

Gasoline engines require both fuel and spark in order to operate. Since the mower has fuel the next area of concern is the spark. Try removing the spark plug cleaning the hole with a pipe cleaner. Take the old plug to a hardware store and purchase an identical plug. Reinsert the plug and fire it up!


Answer by  C4rys3 (56)

I had a problem with my lawn mower not starting once. It would start, then die quickly. I changed the spark plug first. Still did the same thing. Finally I took it down and had it tested and while it was there the tech primed the mower, then tried starting it, he primed again and it stayed running


Answer by  Don73 (90)

First check your spark plug to make sure that the tip is not black w/carbon, if so replace it. Then check the air-filter for any blockage and replace if needed. Lastly, check the fuel line to see if it is blocked or leaking fuel. Most likely cause: bad sparkplug.


Answer by  Euripides (174)

Could be one of several things: plugged fuel line, bad spark plug or plug wire, or, especially if the mower has sat for a while with fuel in it, varnish in the carburetor. Check all three; it'll be one of these 99% of the time.

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