Question about Psi Blue Max 2200 High Pressure Gas Power Washer

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The pressure decreases when trying to wash

It idles rough also looses pressure when using it. Changed spark plug.
Still the same

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Dear rjrdiaz1013,
First you must find out where the real problem is. So first you must see that the engine works smoothly.(checking spark plug, spark plug gap, fuel mixture..etc..etc..). You have to do this by having no load at the pump. So remove water inlet hose and gun. If you manage to get the engine running smoothly,...then for sure you must service the pump. The pressure usually decreases from a faulty "Spill Valve". When the gun is closed the spill valve compresses and lets water circulate. When the gun is opened, the spill valve extends and closes an opening at its end. If this opening is not closing correctly, then the water keeps circulating and hence no pressure. My advice change the 'Spill Valve" by a new one. If the pressure is not 100%...then the next step change the suction valves. To change the suction valves, you must also change the high pressure and low pressure seals. Also better to change oil and oil seals. BUT the pistons must be examined. If the pistons have damage and cracks, these must be renewed, because they will ruin again the seals. In problems like these, I always fix the problem by changing the Spill Valve and the suction valves if need be.
When all necessary service is done, always try to start the machine with no load first. Also inportant that all seals and spill valve must be lubricated with the correct silicon grease.
Regards,
Fulltech.

Posted on Apr 22, 2009

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Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration

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