Broken Motor Mounts

[Rocket Man]

The only reason I chose to change the mounts was solely because of undiagnosed "rough idle", no clunking, and no problems while moving. I wouldnt have thought the vibrations I was feeling would be motor mounts. A lot of post on the "rough idle" subject state that this is normal for these trucks. I knew that was BS but almost accepted it.

A few people in this thread stated they had mixed mounts (H3 driverside with original hydraulic passenegerside), with no issues. After replacng the driverside with H3 mount myself and having that actually magnify my problem I elected to change both to stock. Not because I like or want to change them out again, but to get rid of any possibility that the mounts were a cause of vibration. I'm not saying that the H3 mounts wouldn't have worked had I done both sides. I just knew that I couldn't cross the mounts off the list completely if I ended up still having a problem. Didnt want to do it all again a week later. I saved myself alot of money and finally fixed a problem I'd been chasing!

I should've taken pictures of the parts I took out, but neither mount looked terrible. Driverside was obviously bad, though mostly intact, it had quite a few .5"-1" cracks and noticeable rust color hydraulic leakage. The passenger side looked 90%, with small cracks but no real signs of leaking. I should've cut it open to see what was left, but it was a long day. I'll never know if just a driverside original mount would have fixed it, but it's all new now.. trans mount too.

IMO your motor mounts weren’t your problem, but the fluid-filled ones are helping to mask it. In other words, your rough idle is still there and hasn’t been fixed.

 

[Rwayne]

IMO your motor mounts weren’t your problem, but the fluid-filled ones are helping to mask it. In other words, your rough idle is still there and hasn’t been fixed.

Honestly I was afraid that it wasnt going to work, the movement seemed the same. I didnt even test drive it right away. Boy, was I surprised when I did hours later. Prior to, I had it looked at by four different shops. Most recommended new plugs and wires(they are new). I had one shop do a smoke test suspecting a vacuum leak. Had the dealer that mentioned the driverside mount do the full fuel system cleaner.
Replacing the mounts has given me the most improvement.

 

[iamdub]

A little bit more "solid" or "firm" is fine for me.

I am just a little apprehensive because I remember when I had my G8, everyone recommended the PPV struts and shocks and said they were just a little more firm than stock. Which was complete BS, it literally ruined the car. Got so many complaints about that thing after that with passengers.

I like the smooth ride it has so don't want to hurt that. If it's just a little more rocky at idle, that's fine. As long as there is no difference while moving, I don't care. It's going to rock a bit more anyway with my headers and cam going in.

Then go with the H3s to do it once and never worry about it again. Firm struts/shocks will affect the feeling at all times and, like you said, ruin the car. Slightly firmer mounts would only make a difference at idle since that's where an engine is roughest (unless it has problems, obviously). But they are NOTHING even remotely like poly mounts which, even still, are only felt at idle.

 

[OR VietVet]

Chris, I am still having a hard time getting used to your picture with that aluminum hat. Plus, "Weird Al", c'mon man.

 

[iamdub]

Chris, I am still having a hard time getting used to your picture with that aluminum hat. Plus, "Weird Al", c'mon man.

Yeah, I'm kinda ready for a refresh. Lemme see what jumps out at me...

 

[ls1frc]

Then go with the H3s to do it once and never worry about it again. Firm struts/shocks will affect the feeling at all times and, like you said, ruin the car. Slightly firmer mounts would only make a difference at idle since that's where an engine is roughest (unless it has problems, obviously). But they are NOTHING even remotely like poly mounts which, even still, are only felt at idle.

Ok they will go on when I do my headers Monday. Will report back.

 

[OR VietVet]

Yeah, I'm kinda ready for a refresh. Lemme see what jumps out at me...

The newest pic should not have JUMPED OUT AT YOU. You are better than this.

 

[iamdub]

The newest pic should not have JUMPED OUT AT YOU. You are better than this.

C'mon, man, cut me some slack. I'm going through Mardi Gras.
Maybe I should make one that says "There are too many people in this state. Louisiana needs a plague."

 

[OR VietVet]

That I can get behind.

 

[ls1frc]

I only see videos on doing the driver's side.

Anything on the passenger side to look out for? Exhaust will be completely off the car. I wonder if that will make the whole job easier.