I have a 99 monte ls it will try to start but dont we replaced the crank sensor the cam sensor the battery the computer over 3 yrs ago and now when its real cold out it wont start plz help

 

Does it crank? If not, it could be a VATS issue.

 

This is gonna sound dumb but what is vats

 

Vehicle Anti Theft System - Basically the key. There is a resistor embedded into the key with provides a signal to that allow the car to start. If they go bad, the car wont start.

Do you have another key? If so, try another key. If it starts the first key is bad.

A very simple "starting" point for a no-start condition.

 

Sometimes the contacts inside the ignition switch get worn out, other times the small wires going to the switch lose contact, the contacts on the key wear out... Definitely try another key if you have one. There is a VATS bypass to avoid replacing the ignition switch. This page has a lot of useful info on that procedure http://thealdensorg.dyndns.org/vehic...BypassVATS.pdf