Smith tow behind will not idle down?

by Loren
(Dickens, Iowa)

Hello,

I have a just bought a smith 100D 100 cfm 125psi 302 ford, tow behind compressor .
As soon as it starts it runs wide open and when I close the main air valve that goes to the hose the motor dies . Does it ever go to IDLE ? Is this normal ??

_________________________________

Might be pressure sensor
by: Doug in s.d.ca

No, this is not normal. Could be pressure sensor or engine control stuck/jammed.

________________________________

Leak in after cooler
by: Loren

I found a leak in the after cooler will this cause the unit not to idle down? And if so is it a big job to fix it? Thank You, Loren

________________

Let it warm up first!
by: Anonymous

Let it run for a minute with valve open. Lets the engine warm up and it will not die out.