im doin my slp headres and plugs/ wires too. so i was changin the plugs and i see a sensor in the drivers head between the 2 and 4 cyl. what is this and what does it do? and mike if ya read this, quit thinkin what yer thinkin cause i didnt break it.

 

are you talking about in the engine block?
because that is your water temp sensor sending unit..

 

it is a coolant sensor, just be carefull when taking it out, i broke two of these and had to replace them when doing my lt's. use a deep-well socket and don't let it slip off, it will snap the plastic end right off and cost you around 25 bucks for each time you screw up!

thomas

 

It's in the head.

 

so it is
my bad..

 

well im not going to take it out, i was just curious as to what it was.

 

Thats cylinders 1 and 3

 

I broke that one and the one on the water pump... that damn plastic gets brittle, be careful.