Terry Haines wrote:
Only the Duratec has the knock sensor?
  The official Ford service manual for the 1996 Contour/Mystique seems to make it very clear that both engines are equipped with knock sensors.  It describes the procedure for removing & replacing it, with differences noted for the two engines, and different torque specs for the two engines.

{I do hate spam, but that isn't really part of my email address.  Remove the string ?HatesSpam? from the email address ?BobHatesSpam@blaylock.to? to email me.  No advertisements.  Spammers will be dealt with very harshly!}
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Moonlight Blue 1996 Mercury Mystique GS , Zetec engine, ATX.  No mods. (Well, OK, one mod.  Before I got rid of my previous car, a 1994 Tempo, I swapped radios.  I liked the Tempo's radio better.  That counts as a mod, doesn't it?  I also kept one of my Tempo's wheels to use as a spare.  I hate those stupid ?compact? spares that come with modern cars.  Does this count as a mod?  If so, I guess I have two mods.  Replaced burned/melted blower switch and connector on 19 February 2002 with a 1P3T toggle switch from Marvac and a Molex connector from Rat Shack; I guess this now makes three mods.)