03-14-2016, 05:56 AM
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#1
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Registered User
Join Date: Jun 2015
Location: Massachusetts
Posts: 97
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Serpentine Belt
Hey all. I have an intermittent squeak. Doesn't happen at idle, but squeaks a bit when I apply a tiny bit of throttle, stops once I get it up to about 2K rpms... These observations only when the car is out of gear (can't really hear it much when pulling away driving). I'm thinking the serpentine belt? Or at least that's a good place to start? I got the car last year and had a decent amount of work done to it, but didn't replace the belt and don't know when if ever it was done. Car has just under 80K on it.
Also, as an aside, is it worth getting the genuine Porsche serp belt, or is an aftermarket fine (genuine is about $52, aftermarkets around $28). Not a big deal spending the extra but wonder if it's even worth it.
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2003 Boxster S
2004 Carrera Cab
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03-14-2016, 06:32 AM
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#2
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,798
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the aftermarket belt is just fine to use.
no reason to spend extra $$ just to have a Porsche part number on it
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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03-14-2016, 07:19 PM
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#3
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by JayG
the aftermarket belt is just fine to use.
no reason to spend extra $$ just to have a Porsche part number on it
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I am pretty sure that the Porsche belt is dipped in unicorn tears and then dried as part of the manufacturing process to provide lifelong lubrication to the belt to prevent squeaking. 
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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03-14-2016, 06:33 AM
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#4
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still plays with cars...
Join Date: May 2011
Location: Baden, ON, Canada
Posts: 1,088
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Serpentine replacement is pretty cheap and easy to do. You should be fine with an aftermarket belt.
It could be one of the idlers as well. Pull the belt off and run it for a few seconds, and if it doesn't duplicate the sound, you can rule out the belt driven accessories.
Just thinking... if it's kind of an intermittent chirping sound, it may be a loose spark plug.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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03-14-2016, 07:28 AM
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#5
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Could be a pulley or guide bearing.
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'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
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03-14-2016, 07:33 AM
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#6
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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It could also be a loose spark plug. They are known to make a squeaking noise when you apply throttle.
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03-14-2016, 09:08 AM
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#7
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Registered User
Join Date: Jun 2015
Location: Massachusetts
Posts: 97
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Thanks everyone. Good suggestions and info. I would have never thought of the spark plugs. Had ignition coils last year so I think they replaced the plugs too. Doesn't mean one didn't come loose though of course. Think I will start with the belt (since I don't know when it was last replaced, if ever) and then work my way through the accessories driven off the belt if the belt doesn't fix it. Then spark plugs if i don't get it then. One more piece of info that probably helps diagnose. It doesn't seem to squeak when the car is first started / cold. Only seems to do it after a bit of a drive... So to me maybe the belt is warming up and starting to slip a little?
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2003 Boxster S
2004 Carrera Cab
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03-14-2016, 03:49 PM
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#8
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Registered User
Join Date: Oct 2015
Location: Austin
Posts: 395
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Quote:
Originally Posted by Myoung73
Thanks everyone. Good suggestions and info. I would have never thought of the spark plugs. Had ignition coils last year so I think they replaced the plugs too. Doesn't mean one didn't come loose though of course. Think I will start with the belt (since I don't know when it was last replaced, if ever) and then work my way through the accessories driven off the belt if the belt doesn't fix it. Then spark plugs if i don't get it then. One more piece of info that probably helps diagnose. It doesn't seem to squeak when the car is first started / cold. Only seems to do it after a bit of a drive... So to me maybe the belt is warming up and starting to slip a little?
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Is possible but in my experience belts slip more when cold than when warmed up
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2004 Porsche Boxster S
2004 Porsche 996 Targa
Udo
1998 Porsche 986
