| I've noticed when "hitting" the throttle from a standing start, or when
| going up a hill in O/D (at low RPMs) the engine makes a "rattling" noise.
| low RPMs not under load (flat pavement), or at idle it's quiet. It only
| makes the noise under load at low rpms. I'm guessing this is the timing
| chain getting a little sloppy?
| The engine is otherwise sound, no oil leaks, mobil-1 synthetic for the
| 30,000miles, no smoke, no problems with emission testing.
| If it is the timing chain, does anyone have any tips on what to watch out
| for when changing it? can it be done with the engine in-car?
| (1997 Taurus GL, 3.0 vulcan, ~120,000miles)
Take a look see if your exhaust heat shield is loose.