Frustrated 2

[SHOYAY]

Secondaries rattling? You can pull the vacuum hose to them so they open and see if it stops. If it's an ATX car, the timing belt tensioner will make noise when the engine is running. It might seem fine with the car off, but if you pull the top timing cover and rev it, and look down into the middle cover you can see the tensioner pulley moving around and hitting the timing cover, it sounds an awful lot like a knock.

92 mtx.I've been thru it all...rod bearings, tensioners, valve lash, chains, sprokets, changed them all with known goods or new... coming from right around #6 cyl area.