mk3-4-me;1628962 said:
what year is your car? are those 3 knock sensors? Mine only has 2, its an 87 though so its probably different...
Its a NA block that was converted to Turbo With Turbo Electronics etc. The Na block uses 1 Knock Sensor placed in the middle like you see above. When you convert a block to use for turbo you tap the two turbo knock sensor holes (outer two in picture) my guess is that the NA knock sensor was just left in the block.