Thud when pressing accelerator

[prwood]

The front of the engine flop during the break revving is concerning. Loose trans torque mount could be suspect. Excessive play in the upper mount could just be compensation.

CV axel play looks nominal.

I checked the transmission torque mount today and it didn't seem loose. That being said, I just checked it by reaching under the car while in a parking lot, so the weight of the transmission was probably holding it firm. Would I need to lift the transmission to relieve the load on the mount in order to properly assess it?

[DeadEric]

Block of wood on a floor jack, lift it by the oil pan.

You can find out how far you can move the engine that way. Don't over do it on the lifting. Get it close to the mid point of movement and what ever is loose should be floppy.

[prwood]

I jacked up the engine about an inch this weekend, and at that point there wasn't any play in the torque mount. Not sure if I should try to lift it farther. Here's a quick video:

[youtube][/youtube]

[abscate]

I would stick a bar in there and twist, very gently, looking for looseness in the rubber parts. I don't think hand strength will be enough to check that. It is nice and solid on jack-up though, agreed.

[RickHaleParker]

It is called a Torque mount and not a lift mount for a reason.
You need to determine what it does when the bottom of the engine moves horizontally not vertically.

1. Put the car back on the ground.
2. Place a webcam on the ground pointing up.
3. Step on and hold brakes, while in gear press the accelerator a little until you hear the thud.
4. Do #3 a couple of times.
5. Review the webcam footage.

You can do the same for the other mounts.

[gcha8e]

Read through this thread hoping to find out about the top mount play... I replaced my top mount because a mechanic said it was worn on my 2005 (old stock?). I checked, it the bonded rubber was cracked.....the replacement for it was, of course, the square mount, and yes, it has the play in it. I can rock the cross member forward and back with my hands and see twisting in the connector bar behind the mount. And the mount bushing is visibly moving. To me that was very strange.

I noticed no change in the clunkyness of the car at all after swapping out.

My two cents on the mount.... the rubber is square and it engages the mount within at a direct angle, without any twist. The old mount seemed badly built because the rubber "spokes" clearly experienced twisting. The new mount is designed to allow movement and brace the engine without putting a twisting motion on the bushing rubber. The rubber will survive forever I'd say.

My one cent worth on your clunk.... if it sounds metal to metal... doubt it would be one of your mountings.
Another cent... is the clunk always identical? can hard acceleration make it thud heavier?
could any accessory, pump, or other major part of the engine be loose? Fuel system?

[prwood]

Read through this thread hoping to find out about the top mount play... I replaced my top mount because a mechanic said it was worn on my 2005 (old stock?). I checked, it the bonded rubber was cracked.....the replacement for it was, of course, the square mount, and yes, it has the play in it. I can rock the cross member forward and back with my hands and see twisting in the connector bar behind the mount. And the mount bushing is visibly moving. To me that was very strange.

I noticed no change in the clunkyness of the car at all after swapping out.

My two cents on the mount.... the rubber is square and it engages the mount within at a direct angle, without any twist. The old mount seemed badly built because the rubber "spokes" clearly experienced twisting. The new mount is designed to allow movement and brace the engine without putting a twisting motion on the bushing rubber. The rubber will survive forever I'd say.

My one cent worth on your clunk.... if it sounds metal to metal... doubt it would be one of your mountings.
Another cent... is the clunk always identical? can hard acceleration make it thud heavier?
could any accessory, pump, or other major part of the engine be loose? Fuel system?

I actually describe it as a "thud" rather than a "clunk" because it sounds like something soft is being hit. It almost sounds like a basketball slamming against a wall, only lower pitched. It's actually easier to feel than it is to hear. It is definitely not a metal-on-metal sound (clunk or rattle), which I do have experience with when struts/springs/sway bar bushings have been out of whack.

[prwood]

Shot a video of the mount from underneath while shifting the car from P-R-D-P with a few revs on R and D. Sorry the composition and angle are a bit weird... that’s the widest angle I can get with my iPhone given that there’s only about 8” of clearance between the ground and the mount.

[youtube][/youtube]

I don’t see any side to side movement, just some front and back movement depending on whether I was in D or R. It doesn’t seem like much to me, but I don’t know what to expect.

Also, the actual “thud” I hear does not occur anywhere in this video, because I haven’t been able to duplicate it while stationary. It only occurs, as such, when I’m driving.

[EngineeringBloke]

I hear a clink each time after the revs let up.

There does NOT seem to be much movement in this mount.

When I replaced my transmission mount, I was able to wiggle the mount as so much of the rubber was missing and I could see through gaps in the rubber, that were not there on the new same replacement - which was solid. This was after taking it off, so not a good comparison.

I wonder if you need new motor mounts but I am not an expert and have not replaced mine on my '06 with 110,000 miles.

[prwood]

I hear a clink each time after the revs let up.

There does NOT seem to be much movement in this mount.

When I replaced my transmission mount, I was able to wiggle the mount as so much of the rubber was missing and I could see through gaps in the rubber, that were not there on the new same replacement - which was solid. This was after taking it off, so not a good comparison.

I wonder if you need new motor mounts but I am not an expert and have not replaced mine on my '06 with 110,000 miles.

I have replaced all five mounts, all with Hutchinson OE mounts:

1. Transmission torque mount @ 213,415 miles (35,420 miles in service)
2. Upper engine mount @ 229,173 miles (19,662 miles in service)
3. Right side engine mount @ 232,651 miles (16,184 miles in service)
4+5. Front/rear hydraulic mounts @ 242,035 miles (6,800 miles in service)
Current miles: 248,835

I'm hoping that it's not one of them, although earlier in the thread some folks theorized that replacing them piecemeal could have led to early failure of other mounts. Based on the response to the videos I've posted, however, it doesn't seem like there's an issue with the mounts. That being said, I bought all of them from FCP Euro, so in theory I could use the lifetime replacement and replace all of them at the same time to see if it helps.