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wow...must be bad luck or bad gas or something, you ever get a wideband A/F reading on the car? What exactly blew on the last engine?
"BSoneMega" may be on to something with the bad gas causing ping. He is also right that knowing what went Kafloooeey on the last engine would be usefull. Can you give a better description of the symptoms/circumstances and the noise itself? Tick, knock etc. can be a little vague. Does the noise vary with RPM etc.
FWIW, I know the very early Duratecs (Mine Included!)had a problem with the rod bolts not being torqued to spec and many went to the great bone yard in the sky! (Actualy went back to Ford for tear down and "failure evaluation".  That got some bad press 'cause it happened to either Car & Driver or Road & Track during a road test for a feature article back in 95!
Was the replacement engine truly new, or was it a remanufactured motor? I believe they are done in two different facilities.
Former, now returned CEG'er!
95SE MTX, (AKA "The Road Rat"). Stock except for:TH fix, B.A.T. big brake kit, tranny cocktail and lots of re-insulated wiring! May yet be a 3.0!
"Speed doesn't kill, stupidity does!"
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