Air compressor motor cutting out at high pressure

[ericconn]

Hi, I have a Honda-powered gasoline air compressor motor that is cutting out when the tank reaches high pressure, instead of just throttling down. Is anyone familiar with the mechanism that regulates this? Thanks a lot for any help.

[KE4AVB]

Could very well be a bad spark plug. I had one that did this several years ago. Just it reached the throttle back pressure the engine would just die and could be restarted until I bleed the tank pressure.

We also will need your equipment numbers to better help you with problem.

[ericconn]

Ok, thanks. It has a new spark plug, put in about a year ago. Rebuilt the carb a few months ago. It's a Honda GXV140, I believe.

[ericconn]

Sorry, forgot to include tank, it's an Emglo 30 gallon tank.

[KE4AVB]

Ok, thanks. It has a new spark plug, put in about a year ago. Rebuilt the carb a few months ago. It's a Honda GXV140, I believe.

Doesn't mean the plug hasn't failed. Even new plugs right out the box can be bad.

[ericconn]

Ok, I will pick one up and see if that helps. Might be a while due to the cold, but I will let you know if that works. If that isn't the case, is there anything else that might be acting up? Thanks again.

[KE4AVB]

Ok, I will pick one up and see if that helps. Might be a while due to the cold, but I will let you know if that works. If that isn't the case, is there anything else that might be acting up? Thanks again.

If it is very cold the compressor oil might be to heavy too. I know the electric compressor of mine don't like it below freezing. It will trip one of the 20amp breakers during this time on a fairly regular basis. I just haven't got around the changing to the winter weather oil. Anyway way I looking a 60-80 gal unit to replace it.

The throttle down is probably done by air solenoid pressure by putting the carburetor linkages in idle position while to air pressure is at full pressure and at a preset low pressure goes back to full throttle until maxed again. If it has been working fine until lately the idle passages in the carburetor could have clogged back up with trash. The question here is will it idle without a load on the engine?

We go will through some other troubleshooting ideas when you get around to working on the unit but for it will be nothing just guess work... This will us keep our train thoughts together easier.

[NevadaWalrus]

Sounds like the by-pass valve is frozen causing tank pressure to stall engine when it wants to idle down.

[KE4AVB]

Sounds like the by-pass valve is frozen causing tank pressure to stall engine when it wants to idle down.

Good thought...I haven't work on enough these to know them well at all. Of course there is moisture in the air that why tanks have be drained every so often either manual or thru an automatic drain setup and eventually rust out.

If he knows his normal throttle down pressure setting he should be able tell to if it trying to go over that setting from a regulator valve being frozen.

[smallen]

if unit has been working ok recently, then im with nevada, watch throttle control has pressure builds, when unloader kicks throttle down and unloader starts releasing air, the throttle control at carburetor will move toward idle speed, if idle ports in carb are blocked it will stall, if engine has been worked on, idle maybe set to low, post model on complete unit, not just engine numbers