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

Reply
 
LinkBack Thread Tools Display Modes
Old 02-26-2008, 01:52 PM   #1
Registered User
 
Join Date: Feb 2008
Location: london
Posts: 5
Unhappy 896 Knocking noise from rear quarter passenger side

I have been experiencing knocking noise from the rear quarter of the passenger side....this noise seems to be worst when driving around 15-20 mph around the bumpy urban street.

The knocking seems to be more evident when the car is cold and in the mornings.

I have already changed the passenger side longetudial arm .... yet it only dampened the noise and did not eradicate it.


Any clues ?

Many thanks
kouros is offline   Reply With Quote
Old 02-26-2008, 05:53 PM   #2
Registered User
 
Join Date: Feb 2006
Location: Illinois
Posts: 701
sounds like you are suffering from the dreaded "896" rear quarter passenger side knock..all too common
super66 is offline   Reply With Quote
Old 02-26-2008, 08:26 PM   #3
Registered User
 
Lil bastard's Avatar
 
Join Date: Feb 2008
Location: Du Monde
Posts: 2,199
maybe CV joint?
__________________
1990 Porsche 964 Carrera 4 Cabriolet
1976 BMW 2002
1990 BMW 325is
1999 Porsche Boxster
(gone, but not forgotten)
http://i933.photobucket.com/albums/a...smiley-003.gif

Never drive faster than your Guardian Angel can fly!
Lil bastard is offline   Reply With Quote
Old 02-27-2008, 04:45 AM   #4
Registered User
 
Join Date: Aug 2007
Location: Virginia
Posts: 244
CVs make a tick-tick-tick sound (that gets faster with speed and then tends to go away at higher speeds) as they start to go, not what I would call a knocking sound -- but we all use words differently, so maybe that's what it is. If you ignore that for too long you may get a more meaty knock just before catastrophic failure.

It's very easy to diagnose CVs by feel. Just crawl under the car, grab the 1/2 shaft in the middle of it's length and slide the half shaft in/out (that is towards and away from the tranny flange) and see if it moves smoothly and is well damped by grease. If you feel any roughness then you've got problems. If it moves too easily, but still feels smooth then you need grease, but should be damage free -- and in this case doesn't explain your knocking sound. Check both sides to compare feel. Since you have no noise on the driver side, I'd start there so you can learn what CVs should feel like first.

If you are a complete n00b it may be best to take to a shop. CV (and/or suspension) failure can be a safety concern, so it would be $ well spent if you aren't sure how to diagnose.

Good luck.
__________________
-- John
'00 Boxster S
'86 911 Carrera Coupe (Sold)
Lucky is offline   Reply With Quote
Old 02-27-2008, 06:28 AM   #5
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,648
Garage
How old is you car? How many miles? Another common problem is worn /slipping motor mounts that cause knocking over rough surfaces and hard cornering. Get her up on a lift and start poking around. There is a good motor mount repair DIY over on Renntech.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
Topless is offline   Reply With Quote
Old 02-27-2008, 09:13 AM   #6
Registered User
 
Join Date: Sep 2007
Location: NJ
Posts: 126
I have the same exact issue, and have not yet been able to determine what is causing the noise. Please keep me updated.
__________________
2000 Guards Red Boxster

There is no substitute.
Padawan is offline   Reply With Quote
Old 02-27-2008, 01:35 PM   #7
Registered User
 
stcroixdrew's Avatar
 
Join Date: Sep 2007
Location: Pennsylvania & US Virgin Islands
Posts: 59
I have a 98 Box w/ 55000 miles...I had the exact same sound..BUT it would move now and then from side to side..weird. It turned out it was my front engine mount...swapped it out and all was better and my car felt tighter and new again. Unfortunately..you have to remove it to check it out. I got a great deal at Sunset Imports in Oregon for the part. Its a pretty simple DIY project...I belive I did it on ramps in about an hour.
__________________
Drew Lyons
Red Hill, Pennsylvania
St. Croix, US Virgin Islands
1998 Arctic Silver Boxster
stcroixdrew is offline   Reply With Quote
Old 02-28-2008, 10:26 AM   #8
Registered User
 
Join Date: Jul 2006
Location: London
Posts: 2
Could also be this http://986forum.com/forums/showthread.php?t=9581
Tony Roma is offline   Reply With Quote
Old 02-28-2008, 11:06 AM   #9
Registered User
 
Join Date: Jul 2006
Location: Where the Sewer Meets the Sea, CA. USA
Posts: 2,695
Send a message via MSN to CJ_Boxster
Quote:
Originally Posted by kouros
I have been experiencing knocking noise from the rear quarter of the passenger side....this noise seems to be worst when driving around 15-20 mph around the bumpy urban street.

The knocking seems to be more evident when the car is cold and in the mornings.

I have already changed the passenger side longetudial arm .... yet it only dampened the noise and did not eradicate it.


Any clues ?

Many thanks

When you say "Longetudial Arm", which arm in this picture are you talking about???


If you replaced what is listed as "Upper Control Arm (Track Arm)" and the noise was dampened... chances are you need to replace the drivers side as well cause they usually fail around the same time.

Mine both were rattling at low speeds from 5 - 40 mph over bumps & cracks. Also i noticed on cold days the noise wasnt as noisey but on hot days they were louder.
__________________
--Proud Boxster Owner/Tech,

Carlos J Cazares

FastForward Performance
http://i10.photobucket.com/albums/a1...er/newsig1.jpg
CJ_Boxster is offline   Reply With Quote
Old 07-16-2008, 01:37 PM   #10
Registered User
 
Join Date: Jul 2008
Location: Seattle
Posts: 2
Any updates on knocking noise?

New to the forum so I'm checking to see if there are any updates. I have the same problem with knocking in the rear passenger side quarter panel (2003 S) over bumps at low speeds (10-30mph), but I've also noticed it only happens when coasting. When I apply throttle the noise goes away. Took it in and the repair shop said it was rear struts, which they replaced but the noise is still there. They have had it apart for a couple of days but have not been able to isolate the problem. Any updates?

TIA. Ragman.
ragman is offline   Reply With Quote
Old 07-16-2008, 03:15 PM   #11
Registered User
 
Join Date: Jul 2006
Location: Where the Sewer Meets the Sea, CA. USA
Posts: 2,695
Send a message via MSN to CJ_Boxster
Quote:
Originally Posted by ragman
New to the forum so I'm checking to see if there are any updates. I have the same problem with knocking in the rear passenger side quarter panel (2003 S) over bumps at low speeds (10-30mph), but I've also noticed it only happens when coasting. When I apply throttle the noise goes away. Took it in and the repair shop said it was rear struts, which they replaced but the noise is still there. They have had it apart for a couple of days but have not been able to isolate the problem. Any updates?

TIA. Ragman.
Its the rear upper control arm which makes that low speed knocking noise over bumps and cracks in the road... visual inspection of the arm will not show that the part is faulty, even shaking it around or hitting it with a rubber malet will not cause it to make any noise... so its pretty hard to a repairman who isnt experienced with that particular problem on that particular car to diagnose it. We have a site sponser by the name of Delubozparts who sells an Adjustible version of those control arms at less than half the cost of the OEM Upper Control Arm. Thats where I bought mine from and I love them!
__________________
--Proud Boxster Owner/Tech,

Carlos J Cazares

FastForward Performance
http://i10.photobucket.com/albums/a1...er/newsig1.jpg
CJ_Boxster is offline   Reply With Quote
Old 07-18-2008, 08:36 AM   #12
Registered User
 
Join Date: Jul 2008
Location: Seattle
Posts: 2
Control arm already checked, still knocking.

CJ, thanks for the reply. I spoke with the shop yesterday and they said they had already tried a replacement upper control arm but the knocking was still there. It's back to the shop on Tuesday for more diag.

I may take it to another shop for a second opinion.

Ragman
ragman is offline   Reply With Quote
Old 07-18-2008, 09:33 AM   #13
Registered User
 
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,236
Vertex is now selling rebuilt upper control arms and lower control arms for the boxster. They state they use better bushings that will not wear out as fast.

The price is a lot cheaper compared to Sunset's price on these items.

Deluboz's stuff is adjustable and cheaper, but other threads show 2 issues with them: added weight and they're thicker and can create problems with one's rims and tires on the back.

I'm about to buy a bunch of suspension stuff and I'm going with the Vertex rebuilt items. Had I decided to buy lowering springs or coilovers, I'd have no choice but go with the adjustable aftermarket stuff to correct the alignment issues caused by dropping the car an inch or more.

Food for thought for owners of older boxsters in need of suspension parts... the things that go bump in the night (and day).
__________________
'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
RandallNeighbour is offline   Reply With Quote
Old 10-01-2008, 01:14 AM   #14
Registered User
 
Join Date: Mar 2008
Location: nottingham
Posts: 4
rear knocking front creaking

hi just thought i'd mention my 2000 2.7 drove horrible creaking front suspension and loud knock on passenger side rear all these on bumpy roads at 15 - 30 mph it really felt like a bag of s--- like riding on rusty bed springs and loose. Thought what a lemon i'd bought. Went to indy and replaced front coffin arms I am in UK(lower track control arms) and rear forked control arms (lower control arms) no 8 on the pic and car felt good and tighter. Dont know how a new one drives but the bumps now feel and sound like my 3 year old peugeot so acceptable as i cant envisage dampenend remember we're talking about bumpy roads

Last edited by ricorico; 10-01-2008 at 01:16 AM.
ricorico is offline   Reply With Quote
Old 10-01-2008, 04:06 PM   #15
Registered User
 
Join Date: Mar 2008
Location: Atlanta
Posts: 60
Garage
Bump

Mine was the rear bumper heat shield. It wouldn't make noise at high speeds but driving slowly through the neighborhood and running over sewer plates it sounded like the rear was going to fall off. Tightened all the fasteners and used thread locker and it all is nice now.

Last edited by mmontfort; 10-01-2008 at 05:34 PM.
mmontfort 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 12:41 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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