JCD911S

Is it just my car, or does the back rest of your passenger seat shake while driving with the seat empty? Don't know if I should bother trying to fix it, if at all fixable.

It always catches my attention and gets kinda annoying. Doesn't shake too bad, but enough to be noticeable.

Khaim3

My does the same. I think something is not right

rankoutsider

I had the same issue and found a bolt had worked its way loose. Had a chat with the Porsche Centre guy and he said that it happens occasionally.

You have to take the seat out - pretty easy. Its a good opportunity to clean underneath it. I found the previous owners watch - not a bad one either. So you never know.


See below

Bruce In Philly

Excellent, thank you..... I will do this next time I have a few hours.....

Peace
Bruce in Philly

seahull

I had the same problem when I bought my 2008 a few months back.

The bolt shown in the diagram acts as a pivot, so moving the seat bottom up and down applies twisting force to undo it. After searching for the lost bolt and washers on the floor under the seat and reinstalling them, I torqued it down as tight as I could with a standard Allen wrench.

Function-First

Excessive passenger seat shaking may also be indicative of your engine mounts going bad. The rubber in the mounts wears and sags over time and no longer properly dampens drivetrain vibrations.

JCD911S

I suppose this is possible but I'm only at 27k miles so not likely. I do think the aftermarket exhaust is adding to vibration tho. and I still may be interested in your mounts for less slop in the engine and gear box shifting.

For now I'll give the seat bolt tightening a shot. Thanks for the info guys.

mdrums

As tires wear the balance of them changes slightly. You can hardly feel this but as the slight vibration travel you can see them in the seat back shake. Also different road surfaces can accent this.

One911

Mine does this at idle only

Lvt19672

So the seat needs to be removed to tighten this bolt?

997v2cabrio

hey rankoutsider how does one get a detail image of the maint of our cars?

Edgy01

This is completely normal. The issue is not engine mounts, or anything like that. It has to do with how well peened the seat rails are which will impact the seat's ability to slide through the rails. The loosen they are, the higher the probability that they will vibrate when empty. I know, it can drive you nuts sometimes. We addressed this several years ago.

Lvt19672

+1 if you change your motor mounts to a stiffer one the vibration and shaking will be even worse.

chris.hanle

Remember if you remove the seat and disconnect it (the airbag weight sensor) you will need to reset the airbag light with a durametric/piwis or possibly an ob2 tool(not certain the ob2 will work,,but I think it will). I don't want anyone to trade a squeaky seat for a bright light.

Function-First

As long as you don't turn power to the car on during the process, the airbag light won't get tripped.