stingray454 wrote:
Again, I'm not familiar with the Zetec, but you may want to check the EGR ports behind the throttle body. If its anything like the Duratec's arrangement, expect to find ports clogged with carbon. These must be clear or the EGR won't work right.
  These ports would be where the EGR valve feeds exhaust into the intake manifold?

  This suddenly makes me wonder about something else, that's really off-topic.  My mom has a 1986 Chevette, with very low mileage, but which has a very high tendency to knock, ping, and diesel, even on high-octane fuel.  Do you suppose it could have clogged EGR passages or ports?  This is a car which, before my parents bought it, spent many, many years as a ?spare? car that sat around a lot and very rarely got used.

{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.)