10-17-2009, 05:02 PM
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#1
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Registered User
Join Date: Feb 2009
Location: FL
Posts: 33
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pinging/rattling sound at 3100rpm
03 Boxster S is getting a sound that I would describe as rattling or maybe pinging coming from the engine at almost exactly 3100rpm. +/- 100 rpm and it runs perfectly smoothly. This has been happening for more than a month now. It is fairly loud. Any ideas what this could be?
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10-17-2009, 06:58 PM
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#2
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Registered User
Join Date: Dec 2007
Location: Arizona
Posts: 23
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Mine does that exactly as you describe. I think I recall something about vario-cam action at that speed. I do know that mine has made this sound since the day I got it and no ill effects.
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10-17-2009, 08:31 PM
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#3
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Registered User
Join Date: Sep 2009
Location: The City
Posts: 1,084
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i get some chatter at startup sounding similar to what you describe and im not sure the car gets quite up to 3k when i start her but... idk hopefull someone shed some light for ya
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10-17-2009, 09:31 PM
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#4
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,312
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Engine size?
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2001 Boxster, 5 spd, Seal Grey
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10-17-2009, 10:47 PM
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#5
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Registered User
Join Date: Sep 2009
Location: The City
Posts: 1,084
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well i ahve a 2001 2.7 and teh OP im guessing has 3.2 since its a 03 S
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10-18-2009, 01:14 AM
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#6
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Registered User
Join Date: Feb 2009
Location: FL
Posts: 33
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yes, it's a 3.2
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10-18-2009, 05:04 AM
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#7
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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It's most likely to be the engine mount.
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10-18-2009, 01:33 PM
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#8
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,312
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I would have said motor mount too, but for that it's described as pinging/rattling, when I thought motor mount created vibration. I've got the 2.7 and occasionally, not always, get the seat-of-the-pants vibration at around 3100-3200. I'm at 50k miles, so in theory I'm due for the motor mount.
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2001 Boxster, 5 spd, Seal Grey
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10-18-2009, 02:42 PM
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#9
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by clickman
I would have said motor mount too, but for that it's described as pinging/rattling, when I thought motor mount created vibration. I've got the 2.7 and occasionally, not always, get the seat-of-the-pants vibration at around 3100-3200. I'm at 50k miles, so in theory I'm due for the motor mount.
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Symptoms depend on how worn the mount is.
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10-20-2009, 10:05 AM
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#10
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Registered User
Join Date: Feb 2009
Location: FL
Posts: 33
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I don't feel any vibration. I only hear the sound and it is fairly loud.
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10-21-2009, 07:41 AM
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#11
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Registered User
Join Date: Apr 2009
Location: Perth, Australia
Posts: 165
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Could be a number of things. My 2000 S has exhaust resonance at the same rpm, but then I am running no cats and 2" pipe from the after-market headers to the muffler so it is to be expected.
The first thing I would look at is the exhaust. Maybe a part of it is touching the body of the car??
I would not think it is an engine mount, I replaced mine last week and am familiar with symptoms, but I could be wrong.
Good luck with your diagnostics.
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10-21-2009, 03:24 PM
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#12
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Registered User
Join Date: Oct 2008
Location: San Diego
Posts: 434
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3000ish RPM is where our exhaust hits resonant frequency. If you have a loose heat shield or a catalytic converter that is starting to degrade, that's the RPM where you'll hear it rattling/pinging.
If you post up a sound clip, you might get some better guesses. Good luck!
__________________
1999 Carrera 4 • Aero kit • 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
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05-16-2010, 01:21 PM
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#13
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Registered User
Join Date: May 2010
Location: waterloo iowa
Posts: 8
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Quote:
Originally Posted by sd_boxster
3000ish RPM is where our exhaust hits resonant frequency. If you have a loose heat shield or a catalytic converter that is starting to degrade, that's the RPM where you'll hear it rattling/pinging.
If you post up a sound clip, you might get some better guesses. Good luck!
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I have a 2001 boxster with 100,000 miles on it. I hear a rattling from the catalytic converter, I know, because I used a stethoscope to detect where the sound was coming from. Might be an oxygen sensor cap.
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05-16-2010, 04:47 PM
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#14
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Registered User
Join Date: Oct 2009
Location: Vancouver
Posts: 56
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Might sound odd but I had a similar problem and it turned out to be the steel clip the sandwiches on the center of the under body paneling. Didn't have a nut on it so it was just rattling around in there right at 3000 rpm as well, worth taking a look! Just reach under the car with a flashlight or whatever and wack the under panneling and you'll know right away.
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05-16-2010, 10:16 PM
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#15
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Registered User
Join Date: Jun 2005
Location: LA
Posts: 52
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I have a 2.7 2005 same problem
Took it to the dealership numerous times , mechanics on both LA Auto Gallery and Pacific Porsche told me it's nothing to worry about, it's just the fuel injectors. 5 yrs later no problem so far.
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05-17-2010, 01:00 PM
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#16
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Registered User
Join Date: Jun 2007
Location: Unionville, CT
Posts: 442
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If the car has more than 50-60K on it and you plan on having it next year, you might as well do the engine mount now. First there is a good chance that some minor vibration is causing an exhaust rattle. The 3000rpm area is exactly where the problem is most often noticed. And if that wasn't it, you will likely need one by next year anyway. It should be part of the maint schedule at 60K.
__________________
2001 Boxster, GT3 console delete, lower stress bar, RoW M030 suspension package, painted bumperettes.
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