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It sounds like you either have a clogged nozzle or one that is too small for your pump. At lower speeds the pump is pumping less gpm. So your unloader valve does not cycle. Then when you go to full power. The engine is running faster and pumping more gallons per minute. The nozzle is too small or clogged and so the bypass opens and closes ( surges) Try a new nozzle that is the right size for your machine.
you know the thing has run 400k miles, that is 300k past it designed life. break down and buy a new fan for it, it will set you back about 60 bucks. if you can replace the resistor, you can change the fan. a new set of plugs, plug wires, and a set of tires may be warranted as well.
Fault code No. 22 Symptom >> Air temperature sensor: open or short circuit detected.
Item/components and probable cause
Air temperature sensor coupler
Main wire harness ECU coupler
Check the coupler for any pins that may have pulled out.
Check the locking condition of the coupler. If there is a malfunction, repair it and connect the coupler securely.
2 Open or short circuit in wire harness.
Repair or replace if there is an open or short circuit. Between air temperature sensor coupler and ECU coupler.(Brown/White)(Black/Blue)
3 Defective air temperature sensor. > Replace if defective.
Code 22 > Reinstated automatically if a normal signal is received.
Fault code No.: 60
Symptom: Throttle servo motor: open or short circuit detected. Defective throttle servo motor. Malfunction in ECU (servo motor driving system).
Probable cause of malfunction:
•Open or short circuit in wire harness.
•Defective throttle servo motor (potentiometer circuit).
•Stuck throttle servo motor (mechanism).
•Stuck throttle servo motor (motor).
•Malfunction in ECU.
Diagnostic code No.: 01
FIRST thing to do is CHECK the ETV Fuse - 7.5A I think - This might NOT be in the main fuse box.
Hope this helps
The unit is lean. rebuild the carb with a carb kit and check your fuel lines. If they are brown or discolored or brittle they need to be replaced. carb kits run approx. 11 - 18 dollars from your local dealer.
Just because the horn works doesnt mean the Clockspring is good, the cruise circuit part of it could be bad. Have you had the recall for the brake switch (switch on master cyl) done? The black/yellow and the light blue/pink wire on the servo (steper motor) should be hot (fuses 13 and 5) Brake light switch working OK? The Light blue/black wire coming out of servo should be hot , that wire goes to the column, through the clockspring, to the on/off switch. If that wire is hot coming out of the servo, but has no power at the on/off switch, the clockspring may be bad. You can always make a jumper from the servo to the switch with a wire, if it works, then that confirms the clockspring bad. Good Luck ; )