You know i had the same problem with my tour, it was a ticking/knocking sound coming from the passenger side, like a lifter or something, it wasnt there at startup but when it got operating temperature it would be there, if i reved the engine you could barely hear it, it was annoying, i was ready for a new engine. (I read the above post that states a longblock from Ford at over $4,000 dollars, wow thats a ripoff, i can get one from my local Ford dealer for about $2,350 (longblock) plus of course uncle Sam, recently i know i shouldnt say this here but i raced an Eclipse Turbo i reveed the engine so high in every gear just to win (in which i did) i reved it so high that the noise was gone after,(true story) all that time that the noise was there it ran perfectly fine though. Just my $0.2 .
