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

Post Reply
 
LinkBack Thread Tools Display Modes
Old 06-11-2016, 07:17 PM   #1
Registered User
 
Join Date: Nov 2015
Location: Sydney
Posts: 6
Loud intermittent rattle on startup.

Hi, got an awful noise developed which seems to be worse just after starting. It changes intensity with idling speed. I have put a video on YouTube https://youtu.be/4E_SwvBxiUI

You can hear the noise reduce about half way through after the engine has revved.

It appears to be coming from the rear left of car. Pretty sure that it goes away after being driven for a while, definitely seems to be less pronounced after warming up.

Any ideas as to what it can be?
Thanks in advance...

mbrightside is offline   Reply With Quote
Old 06-11-2016, 07:38 PM   #2
Registered User
 
Join Date: Aug 2007
Location: New Jersey
Posts: 691
Probably just the heatshield. Re-attach it, or just rattle on.

/
__________________
SOLD - 2002 Boxster S - PSM, Litronics, De-ambered, Bird Bike Rack, Hardtop, RMS leak...
fatmike is offline   Reply With Quote
Old 06-11-2016, 09:24 PM   #3
Mig
Registered User
 
Join Date: Oct 2013
Location: Vancouver, BC
Posts: 91
Garage
Either a loose heat shield or might be the inside of the catalytic converter has become detached and is rattling around.

With the engine off, tap the catalytic converter with a rubber mallet and see if you can make the same noise.

Hopefully it's just the heat shield.
Mig is offline   Reply With Quote
Old 06-12-2016, 05:14 AM   #4
Registered User
 
BIGJake111's Avatar
 
Join Date: Dec 2013
Location: Greenville, S.C.
Posts: 2,670
Garage
I have a heat sheild that does that. I put a clamp on it. It now oddly only does it at exactly 1k rpm until things warm up.
BIGJake111 is offline   Reply With Quote
Old 06-12-2016, 06:18 AM   #5
I am my own mechanic....
 
Timco's Avatar
 
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
Use your fist to pound around in the trunk with car off. If heat shield you'll hear it.

Mine made an awful rattle. It was the water pump scraping the engine block.

Chain tensioners have been said to cause start up rattle too.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
Timco is offline   Reply With Quote
Old 06-12-2016, 06:29 AM   #6
Registered User
 
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,453
As said catalysator heat shield. These are holden by DZUS fasteners. In general they rust away and you have to replace them. Expensive.

Regards, Markus
Smallblock454 is offline   Reply With Quote
Old 06-14-2016, 01:06 AM   #7
Registered User
 
geraintthomas's Avatar
 
Join Date: Nov 2015
Location: South Wales, UK
Posts: 852
Mine was the O2 sensor that went into the exhaust at the back, it was loose. I just tightened it and all was fine. But I also found that the heat shields for the cat convertors are missing, so the previous owner had removed them for rattling also.
__________________
Porsche Boxster S Type 986

Bi-xenon Headlight Upgrade | 987 S 18" Anthracite Alloys | Android Head Unit | 5000k 55w HID's | 5000k Cree DRL's | 5000k Cree number plate lights | Cree LED Indicators | One-touch roof operation | Bypass exhaust pipes | Parking sensors | Ambient footwell lighting
geraintthomas is offline   Reply With Quote
Old 06-14-2016, 10:26 PM   #8
Registered User
 
nieuwhzn's Avatar
 
Join Date: Nov 2010
Location: Long Island, NY
Posts: 296
Garage
My left cat heat shield rattles. Once in a while I jack up the car and judicially hit the shield with a hammer. That fixes it for a while. Still trying to find time to replace the secondary cats with test pipes which will also solve the heat shield rattle.
nieuwhzn is offline   Reply With Quote
Old 06-15-2016, 08:54 AM   #9
Registered User
 
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,243
I had heat shield rattles/buzzing a while back and when I discovered what it was (thinking it was MUCH worse) I took a hammer to it and beat the crap out of it and wow, that was a lot more satisfying than I imagined.
RandallNeighbour is offline   Reply With Quote
Old 06-15-2016, 08:10 PM   #10
Shacky
 
Join Date: May 2015
Location: Rochester NY
Posts: 241
I just got this as well. I had previously heard it on downshifting after it got hot. Now it's at idle at start up. Sounds like crap and Porsches shouldn't sound like crap...
shacky is offline   Reply With Quote
Old 06-21-2016, 04:49 AM   #11
Registered User
 
Join Date: Nov 2015
Location: Sydney
Posts: 6
Think it's the cat, tap it and it rattles, plus a think the heat shields have been removed by previous owner... What the hell do they look like anyway !! Thanks for replies all!

mbrightside is offline   Reply With Quote
Post Reply

Tags
boxster , engine , rattle


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 07:20 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page