I have a new EU2000i companion the idles goes up and down when the echo throttle is on runs fine when echo throttle is in the off position

if your question is that my Honda generator wont idle up when I connect a load (tool) and it stalls then . first see if unit will run on constant setting (switch on front) if nothing or still barely runs or stalls , then your problem is carb or fuel filter (inside tank) one or both is most likely dirty and needs replaced/cleaned

Could be a wiring problem or throttle position sensor or the DC motor that controls the throttle position. P0511 Toyota Idle Control System Malfunction

The internal monitor is sensing a load does a load make it change tone? Check the 12 v output and see if it is loaded.

Kevin H

Coils,fuel filter,dirty throttle body.

U will have to get the tps recalibrated

It is possible that the throttle cable is frayed inside the cable houseing, and thats what keeping it from commin back like it should!

You've been running the unit with the wrong oil to gas ratio and now the unit runs rich - there is no real way to fix it at this point - you can adjust the carb but it will not probably hold the idle you desire - but then again blowers are to be ran wide open 85% of the time so don't sweat it too much on this unit but practice better maintenance and a proper mix ratio in the future.

take the carby in to have it assembled correctly
the positioning of the gasket on the right side of the diaphragm is critical

The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage and emits the voltage signal to the ECM. In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM. Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This one controls engine operation such as fuel cut, etc. The throttle position sensor unit has a built-in “wide open and closed throttle position switch,” which is not used to control the engine. For the G35, the throttle position sensor is part of the throttle control actuator.

Also not uncommon to see a plugged idle circuit, cant remember how difficult it was to get to, but it's the smallest orifice in the carb, plugs the easiest, and these are real touchy on fuel, keep it fresh!