Remote start keeps shutting off

Question

I installed a remote start on a 2007 GMC Sierra Classic diesel (2006 electronics).  Evo-All with an Avital 4105 remote start.  Lock, and unlock work fine 100% of the time.  When I set the 4105 to virtual tach, it will remote start and stay running only if the engine was already warm.  If it is cold it will start and after 20 seconds shut off and restart itself.  I set the unit to tach, and it shuts off immediately.  If tach is supported over data, then why does it shut off right away?  Also what would cause the remote start to shut off after 20 seconds and keep restarting itself if i don't use the regual tach feature?

I have the data on F3: D2D.  I have used this unit combination on over 50+ vehicles without an issue, so what is giving me the problem?

Answer 1

When the unit is set to tach over data are you able to program the tach to the brain?