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Vibration in cabin

Tiny
DIVIDES
  • MEMBER
  • 2008 PORSCHE CAYENNE
  • V6
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
Engine bay is clean, I checked engine mounts and they don't feel like they are moving and I don't feel a jerk when I hit gas and brake to check them. But inside the cabin there is a vibration that is worse when the car is cold. Vibration does not change if it's in neutral park or gear, and transmission shifts like it should so I know it isn't the torque convertor. Once you drive of course you don't feel anything, only when idling. You probably won't hear or see anything in the video but no change in the vibration with shifting gears.
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Monday, December 20th, 2021 AT 3:16 PM

19 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

The idea that you feel it at idle does sound like a mount issue. The motor mounts on this vehicle are hydraulic and can fail.

Do me a favor. Inspect the mount and under it to see if there is any evidence that something leaked. The mount can leak hydraulic fluid and cause a vibration.

Let me know.

Joe

See pic below.
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Monday, December 20th, 2021 AT 8:40 PM
Tiny
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Yes, they looked good, but I will check for any leaks. But I have seen Odysseys with hydraulic mounts which didn't leak but they became so mushy, but with 130,000 it is possible. However, there are also transmission and transfer case mounts but that wouldn't cause vibration while in park.
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Monday, December 20th, 2021 AT 8:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Absolutely, but if they are the original ones, check them first. It isn't uncommon for them to fail.

Let me know what you find.

Joe
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Monday, December 20th, 2021 AT 9:24 PM
Tiny
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No leaks at all from either one. Can you find out if the V6 has any damper mounts? I have seen videos on 8 cylinders and turbos but can't seem to find it on mine. But they sell them online and it says it fits v8 and v6.
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Tuesday, December 21st, 2021 AT 11:50 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

The mounts are the hydraulic ones I mentioned. The OEM part number is 95537504900. I would recommend getting a good after-market one because of the price. (See OEM info below)

Those are the only two I am seeing.

As far as removal and replacement, I attached the directions below.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
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Tuesday, December 21st, 2021 AT 2:36 PM
Tiny
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Hopefully, it will be as easy as it sounds lol, most v8 engines require the engine to be removed. This v6 is easier, passenger very easy, driver I still can't see it before I remove the engine carrier.
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Tuesday, December 21st, 2021 AT 2:47 PM
Tiny
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  • MECHANIC
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Hi,

I totally understand. Once you get the carrier removed, you should be okay. If you are not used to doing this, take pics with your camera while you do each step to help with the installation process.

Let me know how you make out. If there is something I can do to help, let me know.

Take care,

Joe
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Tuesday, December 21st, 2021 AT 3:57 PM
Tiny
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No, I have done much worse things than this. As in for example on an m5 had to drop the frame to change a hose, on a v8 had to also drop the frame to change a gasket, and other things. Carrier they mean the plastic underneath skirt right?
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Tuesday, December 21st, 2021 AT 4:09 PM
Tiny
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  • MECHANIC
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Hi,

I think you are referring to the plastic splash cover. That isn't it (nothing ever seems to be that simple). The carrier is a steel bracket that runs under the engine. It requires the removal of the front axle, the engine is raised and supported, and so on.

The interesting thing is this. I've gone through the manual several times. According to the manual, the carrier needs to be removed. However, looking through the directions leads me to think it can be done without removal. If I am seeing things correctly, if you slightly lift the engine and support it, you should be able to remove the mounts. However, the manual does not indicate that.

Before you jump into the removal of the carrier, inspect and study the design. Determine if there is a way to replace the mounts without removing the carrier.

I attached the directions below for the removal and replacement of the carrier. Let me know your thoughts on this.

Take care,

Joe

See pics below.
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Tuesday, December 21st, 2021 AT 4:33 PM
Tiny
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Geez. I see, so the carrier is what the mounts actually sit in. I will try to lift the motor and see if there is enough room, it may be possible, but like you mentioned, the book always tells of how things should be done the right extensive way, with no short cuts, even though a lot of us know that many things can be done in a different way. I am hoping I will be able to do it without having to remove the carrier, even though I have a hoist and other tools I can use to suspend the motor, it's just a lot more work.
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Tuesday, December 21st, 2021 AT 4:42 PM
Tiny
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I totally understand. Let me know what you find or if there is anything I can do to help.

Take care,

Joe
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Tuesday, December 21st, 2021 AT 5:13 PM
Tiny
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I got them both out. The new ones are a bit taller I guess cause the old ones are somewhat crushed. But I doubt these are hydraulic, I have seen hydraulic ones before. The aftermarket ones look exactly like the old ones. The only problem I am having is installing passenger one. I lifted the engine as much as it could go, loosened all the carrier bolts but didn't remove them. All I am seeing is four of them. I don't think axles need to be removed. Plenty of space for the driver side I just need 1/4 inch more for the driver side. Engine is supported, so still fooling with it.
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Wednesday, December 29th, 2021 AT 1:45 PM
Tiny
JACOBANDNICKOLAS
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Hi,

I believe there are only four carrier bolts. What if you fully remove the two on the passenger side? Would that give you the space needed?

Joe
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Wednesday, December 29th, 2021 AT 5:01 PM
Tiny
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I think the four. I loosened were the ones for frame under the carrier then I saw the ones for carrier and loosened it a bit and that gave me enough room. All good, just putting it together now.
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Wednesday, December 29th, 2021 AT 5:29 PM
Tiny
JACOBANDNICKOLAS
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Excellent. Take your time. When you have a chance, let me know how things turn out for you.

Joe
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Wednesday, December 29th, 2021 AT 5:37 PM
Tiny
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All done and good, not at all bad compared to other cars. If this were a v8 it would have been difficult. Thanks for your help.
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Thursday, December 30th, 2021 AT 10:49 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

I'm glad to hear you got it done. Did it take care of the vibration?

Let me know.

Joe
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Thursday, December 30th, 2021 AT 4:49 PM
Tiny
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Yes, it did, they were crushed half an inch. I doubted it would but it did.
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Thursday, December 30th, 2021 AT 5:04 PM
Tiny
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  • MECHANIC
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Excellent! I'm glad it took care of the problem.

Please feel free to come back anytime in the future. You are always welcome here. Plus, it isn't too often I get to work with a Porsche. LOL

Take care and I wish you a great New Year,

Joe
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Thursday, December 30th, 2021 AT 8:18 PM

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