Pressure washer backfiring - Garden

check wiring to the ignition switch for shorts or loose connections or breaks
the problem is intermittent connection for the coil or ignition source

I take it the "gun shot" sound is the engine back-firing...i.e. there is still pressure inside the engine from the combustion of the gas fumes. I would re-check the spark plug gap which should be between .024-.028. If the engine continues to backfire then I would recommend using a higher octane gas so the combustion can happen more rapidly.

Hope this helps.

Hi,

There could be two possible causes for your problem, one is oil level in the engine could be low, or the engine is tilted or not positioned on a level ground, and the second one is water in the carburetor. Check the oil level and replace the oil if necessary, drain the fuel from the fuel tank and the carburetor and clean the carburetor ports and jets, check the fuel for contamination, check and replace or clean the spark plug if necessary, check if the air filter is blocked, dirty, carbonated, or saturated with oil, and replace if necessary.

Check your oil level. This machine has a "low oil shutoff" safety mechanism. If the oil is low it shuts down.

Clean it up real well and try again. Most likely the oil is from the motor being put in a position that allows the oil to run into spots that it is not supposed to be in.

let it idle down after using it then shut it off the carb could be leaking a little with the bad fuel we get only lasting 30days i always turn off the gas and run the gas out of the carb

Hi and welcome to FixYa, I am Kelly.
Back firing can be caused by 2 things... A spark plug / ignition breakdown or.. a sticking engine valve. Before you do anything change the spark plug. ( BPR5ES ) or equivalent. A bad spark plug will still arc at the cylinder head from the outside of electrode to the cooling fins but will not jump across the inside of electrode when installed.
If the unit has been in service for a few years the valve seats tend to get carbon on them and makes it really difficult to get it started. A single backfire can cause it not to start for hours as the backfire loosens carbon in the cylinder head area and prevents the valve from seating; therefor you lose compression. You can sometimes get by with just carb cleaner straight into the cylinder head.. but most of the time you have to remove the cylinder head and hand lap the valves with valve grinding compound. The exhaust valve is most always the culprit.
Most pressure washers do not have an oil level safety switch but if there is one installed these buggers can and do cause havoc when the sensors are dirty (wash with gas then carb cleaner) or the oil is low.

Thanks for choosing FixYa,
Kelly

Don't use the choke, turn the lean all the way to the right and back off 1 and a half turn, its running too rich, usually find this screw under bowl on carb, don't mess with the other screws, take air breather off and let breath without choking, if you have to use the choke after this start with just a little.

Check to see if the carb is clean, if so the anti diesel value could not be working. Apply 12 volts to value and see if it move's. If that works then you may what to check the fuel pump and see if it pumps. After you tried all that then you may have change the main jet size because these engines come with a small jet for the EPA.

Sounds like the governor is stuck. My pressure washer speeds up when it has to pump. Don't know if yours uses vacuum to trigger governor or direct linkage. Good Luck.