"Thunk" when engine starts. Bad motor mount?

[amaff]

I believe I've got a busted engine mount. Is this a common failure on these?

I'm getting a pretty significant "thunk" right as the engine cranks. Is there a 'usual suspect' that tends to go out on these? It looks like there's 5 mounting points for the engine, per the FSM, and I'd like to not have to pull all of them one at a time to see which one's on the way out (assuming that's what it is).

That said: maybe they all make that sound and it's nothing to worry about...

Thoughts?

[Chuck Tribolet]

Have a buddy start the truck while you stick your head, and ears, under the hood.

I can't remember anybody here busting a motor mount.

[00QX4]

Interesting subject...my qx4, when in "AUTO" 4x4, will clunk when I shut the car off. Maybe it could be transfer case?

[01silvapathy]

Interesting subject...my qx4, when in "AUTO" 4x4, will clunk when I shut the car off. Maybe it could be transfer case?

Thats pretty common, its just the driveline going slack after the motor is turned off.