still matching up my wires on my STi engine, and would appreciate some very simple help.

The wiring loom on an early WRX, the section over the gearbox. theres three plugs there. what do they do?? could someone fill in the blanks..

Single wire connector - Knock sensor??
Three wire white - ???
Three wire grey - ???

thanks for all the help people. I would also be VERY gratefull of some pics of this section if poss...


little tip, NEVER send the old engine back before you fitted the new one (although i didnt have much choice)

 

Come on guys, the WRX is the most common car about, surely someone must know...