Viper 791XV remote start on 2004 Explorer

Hello, I installed a Viper 791XV on my 2004 V-8 Explorer.

My problem;

If the Explorer sits long enough for the engine to get cold, the remote start needs to make two attempts to start the engine.  The first attempt cranks the starter too briefly to start the engine, and the second attempt is always successful.  Again, this is only if the truck sits for an extended time period or the engine has time to completely cool off.

I connected the tach wire to an un-common fuel injector wire, since I was not able to sucessfully learn a signal from a coil wire.

During the first attempt, it seems like the Viper is getting a premature tach signal from the fuel injector.  It must be enough to make the viper think the engine started, therefore stoping the starter cranking too early.

What can I do to solve the problem? Any help would be appreciated.  Thanks

What crank time did you program?  My Explorer needs to crank a lot longer when the engine is cold, so I expect problems with cranking too long or too short if I eliminate the tach wire and do that.

I learned it as soon as the engine started.  The viper installation guide said to do it within 5 seconds.  The LED came on, just like they said.

I would really like to fix this problem.  Any help would be appreciated.  Thanks

No, it was cold.   ?????????