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    Passenger Seat Vibration

    Hello,
    Took the 997 out for a nice spirited 180 mile trip through the hills, and for some reason, the car (only 15K now on it) seems to be running a bit "rough" - perfect weather conditions, not too hot or cold. Just had the 2 year service on it about 1 month ago, even though it had not reached 20K miles. One thing that I had not noticed before while sitting at a train crossing was that the passenger seat vibrates like crazy at idle. I mean, it's really moving more than I think it should, so this got me thinking, is it possible I may have worn out engine mount(s) already, even if they were not detected in the 2 year service. I presume, like most modern cars, you cannot visually inspect these...are they filled with gel perhaps?

    Anyone else with a similar experience or do all 997's vibrate like this? I'm thinking of going to the dealership on Monday to sit in some other cars and see if they are similar. Thank you.

    Re: Passenger Seat Vibration

    My car has always had a "choppy" type of idle. The tach needle is stable, but the car shakes a bit randomly at idle. Nothing violent, just "sporty". I've had many people tell me this is normal, and my car performs beautifully, so I'm not worried about it. Others apparently have a calmer idle. Let me know what you find out.

    Peter

    Re: Passenger Seat Vibration

    Mine does it too (but not when someone is sitting in it).

    Gaz

    Re: Passenger Seat Vibration

    Mine does too, as did my 996...

    Re: Passenger Seat Vibration

    Passenger seat vibration is usually an option... I guess you got that one for free. Hope your wife likes it

    Re: Passenger Seat Vibration

    They all do that at idle, even my old 996 (as pointed out in an earlier reply). You will notice that if you turn on the AC and the vibration goes away as this ups the idle by a few revs.

    there is nothing wrong with your car

    Re: Passenger Seat Vibration

    How very interesting - so it's more common than I thought. Thanks everyone for the feedback.

    Great answer Ludikis! I'll have to share that with her.

    I see what you mean about the uptick in the rpms from the A/C or throttle, did that this morning, it does seem to smooth it out a bit...

    Going to make a quick stop at the dealer to see if they notice anything else that might be causing this...if normal...great, if something else comes up, I'll share it with you.

    Re: Passenger Seat Vibration

    Quote:
    Vegas said:
    My car has always had a "choppy" type of idle. The tach needle is stable, but the car shakes a bit randomly at idle. Nothing violent, just "sporty". I've had many people tell me this is normal, and my car performs beautifully, so I'm not worried about it. Others apparently have a calmer idle. Let me know what you find out.

    Peter



    Just a wild guess, but could this be related to the fuel you are using?

    Try to tank up with the best grade of fuel you can get locally and pay particular to whether the engine idle appears to improve.

    Re: Passenger Seat Vibration

    Ditto, vibrates when the car is idle.

    Re: Passenger Seat Vibration

    vibrates at idle with the best Californian fuel (91 octane)

    Re: Passenger Seat Vibration

    Feedback from the dealership:

    The vibration I am seeing in the seats is completely normal per the tech advisor and service manager. We looked at a new 2007 C2S for comparison, no other 2005 models on the lot at the moment, however there is very little vibration in the 2007 model, so maybe it's unique to the year, and they've sorted out the "bug" by now.

    Have always run the highest octane available, either 91 or 93...so, I'm assuming it's a small design issue, maybe all sports cars are just a bit "edgy".

    Thanks.

    Re: Passenger Seat Vibration

    Seat vibration! Now I know why the chicks dig riding in Porsche's so much. And all along I thought it was my charm and good looks that turned them into putty on those long drives.

     
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