A customer brought in his Ryobi 3100 PSI pressure washer (RY80940) with the complaint that the engine RPM's didn't pick up when he squeezed the trigger on the wand. Turns out that he let it sit for a few months before he decided to bring it here, so it wouldn't run at all by the time I got it. He approved a new carburetor, which I then replaced, and the engine runs perfectly. But the idle down function seems to work backwards sometimes, and not at all sometimes. There's not a definite pattern to how it works. But I also noticed that the water pressure couldn't have been anywhere near 3100 PSI. I have a Briggs & Stratton 3000 PSI pressure washer that will break skin if you get too close to the nozzle. The water output from this Ryobi is much weaker, even at high engine RPM's. I'm assuming these two problems (low pressure and idle down feature) are related, but I'm not exactly clear on how the idle down feature operates. A brand new pump is right at $100, so I'm not inclined to spend too much time & effort figuring out the problem rather than replacing the pump. But if any of you have more experience with these water pumps and could help me quickly pinpoint the problem, that would be helpful.
Thanks!