viper 791 think i have a bad brain
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=109349
Printed Date: July 06, 2025 at 8:19 AM
Topic: viper 791 think i have a bad brain
Posted By: csb41502
Subject: viper 791 think i have a bad brain
Date Posted: November 30, 2008 at 12:05 PM
ive had the alarm in for about a year (a 2003 escape).starting today,the car would start,run anywhere between 10-40 sec,die then remote start again and again.i tried starting the car and do tach relearn.that did nothing.then i thought maybe its the bypass.put the key in,turned it to on,then remote started it.that went good,but about 10-15 sec later all the dash lights flashed and the viper tried to remote start the car,a lot of grinding going on.so after that,i turned the car off,remote started it,a lot of grinding,then it started but kept on spinning the starter.i dont know whats going on with it.any ideas?
Replies:
Posted By: Mike M2
Date Posted: November 30, 2008 at 12:18 PM
Seriously doubt the unit is bad. First, when you try the key in the ignition trick, don't turn the key on! Simply set it in the ignition. BUT...thats not your probelm as the immobilzer on a Ford only is needed for the start. After the car is actually running it doen't need to see the key chip. More likely the problem is tach related. Try reprogramming the unit to Voltage sense and see if it works then....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: csb41502
Date Posted: November 30, 2008 at 12:37 PM
ok,changing it to voltage worked fine.what could have happened to the tach output?
Posted By: Mike M2
Date Posted: November 30, 2008 at 7:01 PM
I would check the connection, then re-learn the tach and see what happens....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: csb41502
Date Posted: December 01, 2008 at 7:39 AM
i checked the tach wire and everything seemed fime.did tach relearn and it did the same thing.but works great on voltage sence.
Posted By: KPierson
Date Posted: December 01, 2008 at 9:10 AM
Where is the tach wire connected? How is it connected? Did you unconnect it and reconnect it to make sure there was no corrosion in the splice? ------------- Kevin Pierson
Posted By: xplorin16
Date Posted: December 02, 2008 at 9:14 AM
Where do you live? If your in a warmer part of the country leave it voltage and forget about it. If your up north you will need that tach. Remember FORD = FUEL.
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Advanced MECP
Posted By: csb41502
Date Posted: December 03, 2008 at 3:39 PM
i disconnected the tach wire,checked the connection,and resoldered it.no corossion or nothing like that.when its in tach mode.it continues to crank after its running.but other times it will start fine,then die 30-45 sec later.everything is fine in voltage sence
Posted By: another-kelly
Date Posted: December 03, 2008 at 7:20 PM
is tach connected to a fuel injector or an ignition coil? DEI products (such as your viper) need an injector
Posted By: csb41502
Date Posted: December 03, 2008 at 9:23 PM
right to the injector in the front of the motor
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