ECT sensor question

[pooterpot]

ive read in another post that the ECT should be mounted in T fitting on the front passenger side of the lower intake along with the heater hose. my question is why couldnt i mount it in one of the 2 hole on the back of the lower intake? is it because the coolant is too hot by the time it reaches the back of the block?

 

[67EB_in_619]

Because that is where ford told the EEC it would be... is there a reason you dont want to mount it in the stock location? .. sorry to be a smart ass, but you will effect air/fuel mixture rates if the eec is adjusting based on a temp reading that isnt accurate for what it was expecting... in other words, it will adjust the mix as if the temp was read at the T.

Your guess about temp sounds almost right, but I think you have it backwards.. mounting in the stock location samples the temp as the water is leaving the engine.. it is right by the T-stat.

 

[Broncobowsher]

Correct, the coolant in the back of the intake is only warm, not hot. It has only cooled the block (not much of a load) but has not made the U-turn and come to cool the heads yet.