viper will not work when cold
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=142300
Printed Date: May 12, 2025 at 5:07 PM
Topic: viper will not work when cold
Posted By: sundown57
Subject: viper will not work when cold
Date Posted: December 25, 2016 at 8:10 PM
So I finished installing the viper 5305v into my daughters 02 Jetta automatic.the remote start worked perfect till Christmas morning when I gave it to her and it ran for about a minute and half then shut off. I found out if it sits over night at 28 degrees when I remote start it it will only run a little over a minute. but when I warm the engine to normal it works fine and runs the full 12 minutes. Any suggestions ?
Replies:
Posted By: Mark Mizenko
Date Posted: December 25, 2016 at 8:12 PM
Hook up the tach connection.
Posted By: sundown57
Date Posted: December 25, 2016 at 8:14 PM
I did run a wire from the coil to the violet and white, and did to the start engine with key, press and hold control button till blue light stays on steady, like I say it works fine when warm so I believe it it seeing the tach . but shuts down when cold
Posted By: smokeman1
Date Posted: December 26, 2016 at 7:47 AM
TACH NOT RED / PURPLE or BROWN (AC) any fuel injector
From Bulldogsecurity.com
They do list three version of the Jetta. Jetta, Jetta with PW, Jetta without PW.
https://www.bulldogsecurity.com/bdnew/vehiclewiringdiagrams.aspx
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Posted By: sundown57
Date Posted: December 26, 2016 at 8:42 AM
smoleman1 . I think you are on to it. I had the tach wire hooked to one of the coils . last night I reset tach learn twice with no problem. This morning I tried the RS and it shut off after 90 sec so I pulled the fault code and got code 2 overrun. So thought I would try raving it a bit and reset tach learn. That failed 3 times. the light just flashed. so I moved the wire from the coil to an injector. reset tach learn on first shot and it stayed running this time. Only problem now is I'm not sure if I fixed the problem or warmed it up working on it . so plan to let it sit for the day and try again tonight. thanks for the input .
Posted By: Mark Mizenko
Date Posted: December 26, 2016 at 8:38 PM
I was going to suggest an injector next, that will probably correct it.
Posted By: sundown57
Date Posted: December 26, 2016 at 8:41 PM
I tried it again tonight and it seem to be working . so now I need to know w. why doesn't it pick up the coil when cold but works fine when warm ?
Posted By: smokeman1
Date Posted: December 26, 2016 at 8:50 PM
Sometimes I don't want to know why. It keeps me awake at night.  ------------- When all else fails, Read the Instructions
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Posted By: john ogrady1
Date Posted: January 08, 2017 at 7:23 PM
With coil on plug ignition systems I found you never got a good tach signal.Most of my installs the tach comes from the negative side of the injector.
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