Air Compressor ??

[Hammerhead]

(10-07-2017 )Wiseman Wrote:  This is most likely related to :
1. Bad air compressor governor (really cheap $ )
2. Sticky plunger (controlling the moving valve)inside air compressor head . (Usually caused from soot buildup)

First (and easiest) : engine off
Pull off the 1/4" hose (usually blue color) off air compressor and spray liberally with WD-40. Do the same on the intake of the compressor head too.
Connect it back and start the engine. Let it build air and go off a few times.
Repeat all over again .
If you see improvement , then you'll know air compressor head need replacement .
If no improvement is seen , replace governor .

Be sure your air dryer works properly.

Instead of WD-40, I suggest using Air Tool Oil.
At least if some gets by the air dryer it is formulated to be used in air tools so it won't have anything that may potentially eat at o-rings, valves, sensors, etc and will actually lubricate them a little.