What causes a pressure washer to backfire?

If the washer is backfiring after you shut it off, then it’s technically called, “Afterfire”, in which case throttling down 10-20 seconds before shutoff can help. If the engine is backfiring while running, it can be for various reasons, most commonly due to: -lowering throttle speed too fast. -engine running too hot.Click to see full answer. Likewise, people ask, what causes a backfire?A backfire is caused by a combustion or explosion that occurs when unburnt fuel in the exhaust system is ignited, even if there is no flame in the exhaust pipe itself. That unburnt fuel can be caused by a variety of mechanical problems, and here are some of the most common reasons for a backfire: Running too rich.Also, can a backfire damage an engine? An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engine’s cylinders. This can cause damage to your car’s exhaust or intake if left unchecked — and it also means that your car’s engine isn’t making as much power as it should, and is wasting lots of fuel. Also to know is, what would cause a riding lawn mower to backfire? 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.What causes a small engine to backfire through the carburetor?Usually when the engine backfires through the carburetor when starting, something is wrong in the valve and rocker arm area. Remove the spark plug(s) from the engine. Put a clean small screwdriver into the spark plug opening so you can tell when the piston is at the top of the stroke.

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