my 97 Blazer would crank but would not start. I had a good mechanic do a code scan and he said that the #4 Oxygen Sensor was bad. I changed the Oxygen sensor #4 and now blazer started good. Now I have a new problem 97 Blazer will not even try to start at is like a dead battery. I checked the battery voltage and all is good with the battery. I do not know what the problem could be this time.

 

A bad oxygen sensor will not cause a no start condition, not possible. B1S3 is downstream from the catalytic converter. Its sole purpose is to monitor the efficiency of the converter.


Here are a couple of things to try:


Take the battery cables off of the battery can clean them up, nice and shiny. Both the battery, and the terminals in the cables.... no green fuzz allowed


1997 uses an ignition switch that is unique to 1997. It is known to cause issues like you're experiencing. Testing will require the understanding and use of a DVOM, (digital volt ohm meter). Here is a link that explains: https://blazerforum.com/forum/articl...-switch-33465/