Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 04-23-2010, 07:00 AM   #1
Registered User
 
Join Date: Feb 2010
Location: Toronto
Posts: 23
Exclamation Post Service Jitters

Hey Guys,

Just got my 48000km service done at my P dealer and now when I bring the car just over 3000rpm and let off the gas I feel a noticeable vibration in my lower back as it goes through 3000-2950rpm.

Any ideas? It only happens at this exact rpm range and only when I lift of the gas. Feels most prevalent in 3rd.

Thanks.


2.7boxer6 is offline   Reply With Quote
Old 04-23-2010, 07:04 AM   #2
Registered User
 
tonycarreon's Avatar
 
Join Date: May 2009
Location: Frederick, MD
Posts: 1,396
front motor mount
__________________
"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
tonycarreon is offline   Reply With Quote
Old 04-23-2010, 07:19 AM   #3
Registered User
 
Join Date: Feb 2010
Location: Toronto
Posts: 23
I was thinking it could be something like that but I couldn't think of a reason why it would only be at that RPM. Wouldn't it rattle more coming off of it at a higher RPM?

Even when i step off the throttle at 5000rpm it only shimmies through that range (3000-2950rpm).
2.7boxer6 is offline   Reply With Quote
Old 04-23-2010, 08:00 AM   #4
Registered User
 
Join Date: Jan 2007
Location: BC
Posts: 1,280
I have the same thing. My local PCar mech says it's common and you just have to live with it. If you search the forum(s) you'll find nothing definitive but a few potential causes: loose/poorly designed exhaust components, worn front motor mount, clutch issues. I haven't done anything about mine.
__________________
2001 Boxster, 5 spd, Seal Grey
clickman is offline   Reply With Quote
Old 04-23-2010, 12:51 PM   #5
Registered User
 
tonycarreon's Avatar
 
Join Date: May 2009
Location: Frederick, MD
Posts: 1,396
mine did it at lower RPMs and when slowing down, though in not such a small interval. it might just be a natural thing with your car you've never noticed. however with the mileage it's probably time to at least investigate it - especially if you've never done it. (whoops, just did the metric to english conversion )
__________________
"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."

Last edited by tonycarreon; 04-23-2010 at 12:56 PM.
tonycarreon is offline   Reply With Quote
Old 04-23-2010, 01:04 PM   #6
Registered User
 
Join Date: Apr 2010
Location: trenton nj
Posts: 449
ya just came from service ? aside from the noisey brakes and bad vibes did they do any thing good ?
extanker is offline   Reply With Quote
Old 04-23-2010, 01:57 PM   #7
Registered User
 
Join Date: Feb 2010
Location: Toronto
Posts: 23
LOL yeah everything is running smoother other than the shimmy. The brakes have always been noisy. Also to be fair I rarely took it above 3000rpm before I read the <2800rpm = IMS failure tread, so I may just not have ever noticed it before..

Just got off the phone with the P mech actually, He says that most porsches have squeaky brakes during light braking due to the metallic content in the pads..

He also said that other boxster owners experience this vibration and that 3000rpm is the most turbulent point in the rev range. He also acknowledged that it could be a "tired" front motor mount.

He offered a rid along next week which I'll probably take him up on.

Last edited by 2.7boxer6; 04-23-2010 at 01:59 PM.
2.7boxer6 is offline   Reply With Quote
Old 04-23-2010, 02:13 PM   #8
Registered User
 
Join Date: Apr 2009
Location: Bothell, WA
Posts: 279
When I bought my Boxster @ 47k miles, the mount was shot - and I didn't ever feel the engine. Now that I have an enthusiast mount, the engine is louder most of the time, and transmits a vibration to the seat around 3000k RPM. If you buy a new Porsche mount, you will probably eliminate the vibration and get better quality shifts. Buying an aftermarket mount will keep the vibration, but get you better launches.

Oh, and my brakes also squeel a bit when they are warm, especially during the summer.

-james
__________________

'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
yimmy149 is offline   Reply With Quote
Old 04-23-2010, 06:43 PM   #9
Registered User
 
Join Date: Feb 2010
Location: Toronto
Posts: 23
Good to know! Thanks Yimmy.

Anyone else with similar experiences?
2.7boxer6 is offline   Reply With Quote
Old 04-23-2010, 09:50 PM   #10
Registered User
 
2TrunkSteve's Avatar
 
Join Date: Jan 2008
Location: Allen, TX
Posts: 100
I had that same vibration and for some reason my clutch seemed to be difficult in reverse (48k miles at the time). It drove me nuts and my research suggested the motor mount. I purchased Pedro's remanufactured mount and I am very happy with the results. Pedro's top notch and he makes it as easy as possible to change this out.

Did it myself in about 3 hours - very satisfying when I was done.

www.pedrosgarage.com
__________________
Steve in Allen, TX
1997 Boxster - Thy Toy
2011 BMW X-5 - Wife Hauler
2012 Tunda - Dad Hauler
Fat Tire - Favorite Beer
2TrunkSteve is offline   Reply With Quote
Old 04-27-2010, 10:51 AM   #11
Registered User
 
Join Date: Feb 2010
Location: Toronto
Posts: 23
Thanks for the response steve,

I have been looking at the enthusiast mount is that what you got? A previous post said they still get vibes at 3000, do you? As for the install, I haven't done any work on the car myself other than the de-snorkel and changing a burnt out light! Would you think that I could do the install or would it be worth it to just get it done at the shop?
2.7boxer6 is offline   Reply With Quote
Old 04-27-2010, 04:53 PM   #12
Registered User
 
2TrunkSteve's Avatar
 
Join Date: Jan 2008
Location: Allen, TX
Posts: 100
That's the one.

I have average mechanical skills (at best) and a $150 set of Craftsmen tools along with a floor jack and jack stands. The only part I struggled with was getting the coolant hose clamps undone, they weren't hard to undue, I just couldn't quickly figure it out just by looking. Otherwise it wasn't too difficult. I would rate it a 3 out of 10 on the difficulty scale. I took my time and cleaned everything as I went. I could have done it faster if I had too.

As far as results, I didn't realize how bad off the car was until after I replaced the motor mount. I think it deteriorated gradually so that I didn't notice. I originally thought the clutch was going because reverse was difficult and the car would stall if you weren't careful with the clutch. The 3k RPM issue was bad too, so I figured I would start with the engine mount. I was suprised to find it fixed both issues. As far as the level of vibrations go, it's different than it was (much improved), but it's not Honda smooth. My car never was completely vibration free but I have no difference in the 3k RPM harshness over any other part of the powerband. It's a performance car and I expect some reasonable amount of harshness.

__________________
Steve in Allen, TX
1997 Boxster - Thy Toy
2011 BMW X-5 - Wife Hauler
2012 Tunda - Dad Hauler
Fat Tire - Favorite Beer
2TrunkSteve is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 12:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page