Issopro egt gauge will bounce around. For example sitting at idle.should be a steady reading around 300 or so. It will drop to 100 back to 300 400 and so on. Wanting to know how do I go about checking to see if the probe is going out or if the control box is on its way out.

 

Check all your connections.

Sent from my DROID RAZR

 

Yeah I need to do that. Check the easiest stuff first. Still am interested in finding out how to check the probe and module if there is not a bad connection.