The motor used to go to idle when you weren't spraying and would kick up when you started. I have a porter cable pressure washer with an Annove SJV2.5G.26
SOURCE: Hot water coming out of a cold water pressure washer
This sounds like a heat transfer problem
You should check that the oil reservoir for the pump has oil in it. It sounds like it may be low. Also, if it is a gas model, the engine oil may be low.
Remember the pump oil reservoir should be only 1/3 to 1/2 full of non-detergent oil.
SOURCE: washer stops when handle released
unloader valve not functioning properly causes pressure overload and stalls engine
SOURCE: I have the Coleman powermate 2400 PSI pressure
Sounds like the valve in the handle is sticking closed. May have a broken spring, or maybe a part is stuck..
I say take it apart, and the answer will present itself.. Play with it with nozzle out too... Maybe something is stuck after storing so long and will loosen up.. Fingers crossed
SOURCE: Porter cable pressure washer starts great, but
check the seals and o rings on the connections could be sucking air
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