dashan

I replaced the tranny mount in my 96 LS400 recently. But I still get the vibration at 1100 rpm while driving.
I did the following tests today.
1, I parked the car and the gear is in “Park” and revolved the engine to 1100 rpm, no vibration.
2. I parked the car and the gear is in “N”, engine at 1100 rpm, no vibration.
3. The car was parked and no moving by pressing the brake pedal, the gear is in “D” or in “3”, revolved the engine to 1100 rpm, and the vibration was reproduced.

I am thinking the vibration is caused by bad engine mounts. What else could cause the problem?

Thanks

LiCelsior

iTrader: (32)

um...when u put it in D and holding the brake and accelerator....ur going to get some vibration and eventually a burnout lol.

PureDrifter

iTrader: (10)

yea, the engine is going to do that, you're putting load on the drivetrain, and heating the hell out of the transmission.

never driven an automatic before

TMaxxTim

All you can do is replace all the mounts, and 90% of the time those will be the source of all your vibration problems. If replacing the mounts doesn't solve the problem, there is something more serious that needs to be looked at.

Also, is your vibration at any speed inparticular or does it occur at 1100rpm nomatter what speed your at. Do you notice any other vibrations that appear at other speeds (highway)?

dashan

In the above tests, the car didn't vibrate at 1000, 1200, 2000, or any other rpms.

dashan

No, the car only vibrated at 1100 rpm, no related to speedanys. No vibration on highway.

sonyman

Replace your engine mounts. 1100 RPM must have a resonance frequency associated with it.