791xv trouble

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crazziazz

Member - Posts: 12

Joined: October 17, 2006

Location: United States

Posted: January 01, 2011 at 7:40 PM / IP Logged

Hello guys,

I have a 2000 expedition. I got a 791xv viper alarm for next to nothing.

I know this is a fairly good piece. Everything is working great expesct for start.

Yesterday did great started up ran fine. Today It starts up but then shuts down. All this with key in cylinder. Tach is on pink/white straight on coil.

Reprogrammed tach but noticed when I did I had to rev eng A little for it to pick up.

Any suggestions would be greatly appreciated

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: January 02, 2011 at 6:11 AM / IP Logged

You may have to adjust the tach threshold to a lower setting.

crazziazz

Member - Posts: 12

Joined: October 17, 2006

Location: United States

Posted: January 02, 2011 at 9:00 AM / IP Logged

Is that in the programming remote start options? I already tried turning the threshold off or on.

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: January 02, 2011 at 10:28 AM / IP Logged

No it's on the outside of the brain in the form of a jumper check the base of the brain to verify which is the parking light and which is the tach.

crazziazz

Member - Posts: 12

Joined: October 17, 2006

Location: United States

Posted: January 02, 2011 at 10:33 AM / IP Logged

yes i tried that. Just so strange. I should have know better. A used alarm. Bad thing is i don't have a bit writer. Don't know if anything is locked.

crazziazz

Member - Posts: 12

Joined: October 17, 2006

Location: United States

Posted: January 02, 2011 at 4:50 PM / IP Logged

I changed the remote start setting to voltage instead of tach. Working good now. Been awhile sine I installed. I quit installing in 05. A little behind. Never really did many vipers all prestige(Aps996 etc). But this site has always been the best.

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791xv trouble

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