04-11-2021, 06:48 AM
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#1
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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Air filter failure? Anybody had one?
I noticed a small difference in engine noise at low speeds then when accelerating over 4000 rpm the noise rapidly increased a ton, into a power roar with some kind of "flapping sound". It is not an exhaust noise.
Did my filter fail? If yes, has anybody else experienced this?
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04-11-2021, 09:37 AM
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#2
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Registered User
Join Date: Feb 2017
Location: Stockholm
Posts: 374
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Never happened to me, just open up the engine hatch and check your filter!
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04-11-2021, 10:20 AM
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#3
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Variocam advances can timing substantially at 5500rpm and this significantly accentuates the"intake roar". Vibrational noises, however, are not normal.
Sent from my POCOPHONE F1 using Tapatalk
__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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04-11-2021, 10:53 AM
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#4
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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I've driven Boxsters since 2004 and am very familiar with the sound of the engine over 4000. This is something new and very different.
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04-13-2021, 06:15 AM
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#5
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Registered User
Join Date: Sep 2018
Location: Illinois
Posts: 190
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The only filter I've had fail was one of those foam types. It cost me an engine on a race car. Stock only on everything now.
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A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
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04-13-2021, 06:58 AM
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#6
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550 Anniversary
Join Date: Jul 2012
Location: Surrey, UK
Posts: 747
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I have never seen a good filter fail bit I have on another older car the intake hose collapsing in.
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04-13-2021, 07:44 AM
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#7
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Registered User
Join Date: Jul 2005
Location: MA
Posts: 880
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Are you sure it's not the VTEC kicking in, yo?
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98 Arena Red 986
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04-14-2021, 04:13 AM
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#8
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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I've driven Boxsters since 2004 and am very familiar with the sound of the engine over 4000. This is something new and very different.
And yes I'm familiar with the result of hitting the rev limiter. This is different, you can be sure.
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04-14-2021, 04:37 AM
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#9
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Registered User
Join Date: May 2018
Location: Michigan
Posts: 104
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Did you open the air box and look?
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04-14-2021, 09:20 AM
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#10
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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Good question so I'll share with you about my getting to the engine. First, I had to respect the 20 rule which says the temp. has to be within 20 of my age and since I don't live in CA or FL, that took a few days. I watched a video and got to the engine cover but the Torx bit I had was the wrong size so I researched and went out and bought one marked T40. It didn't work so I researched again and another site says T-30-damned.
Before returning to the store I want to make sure the T-30 is correct. After that, I'll take a look and let you know. :dance:
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04-14-2021, 11:06 AM
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#11
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Accessory belt been changed recently?
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04-14-2021, 11:09 AM
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#12
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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Serpentine belt was changed several years ago.
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04-16-2021, 12:51 PM
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#13
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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Not the air filter
I was able to confirm that it is whole and looks healthy. The hunt continues.
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04-16-2021, 03:44 PM
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#14
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WALDMEISTER
Join Date: Sep 2013
Location: Germany
Posts: 1,337
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I have the IPD plenum, 74mm throttle body, sportfilter and desnorkeled to boot --> 2.7l engine.
Accelerating over 5000 rpm creates such an intoxicating power roar, so massively loud, that you believe you are driving Steve McQueen's 917 in "le mans".
An hour on the autobahn and you are deaf, but still smiling.
So, you are not alone.
P.S.: Forget about sport exhausts
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Original Owner | PORSCHE Boxster 2.7L (MY01) | Seal Gray
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04-20-2021, 03:48 AM
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#15
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Registered User
Join Date: Jan 2011
Location: dedham ,ma
Posts: 72
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Mystery solved
Air filter checked out A-OK so I reinstalled the plastic cover with care.
A high rpm highway test proves that the strange roar with a flapping sound is gone.
I believe the air filter cover was not securely attached at the bottom (two screws attach at the top-2005 S). If all my issues were so easily found and fixed............
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