white plug (sensor)??

93 blazer...
The only physical exterior damage I can see is to a white plug or sensor that plugs into the drivers side of the engine. (located close to the middle S.plug).
There is only 1 grey wire coming off it making me believe its a sensor.
Does anyone know what this is , and may it be the reason for my blazer not starting?
Im going to replace it, but dont know what it is. Thanks

That is your knock sensor, and no it will not cause a no start.  I read your other post and it stated that you have not checked fuel pressure yet.  Do that and if you have not yet done so check for spark also.  Korey.

hey thanks Kordog! You really know your stuff!
To test the pressure I just take the gauge and screw it on the valve you explained to me in other thread right?
Do you know what psi it should be?

*LOCKED upon author request*

I'm trying to consolidate these threads.  Here is the originating thread:

radiator replacement and blazer wont start related??