04-06-2012, 06:22 AM
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#1
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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Load banging noise
Just now I was driving, and on a heavy acceleration, when I reached around 70MPH I heard a sort of backfire noise and a loud rattle from the exhaust. I put the car in neutral and stopped at the first place I could. On idle there seems to be a banging noise like some metal parts are hitting against each other, and when I give it some gas on neutral the banging noise keeps the same noise level, only the frequency increases. I am not sure exactly from where the noise is coming, but I can hear it most from underneath the car, so I am not sure if its from the exhaust or from the transmission/engine. Any ideas? Every month something bad is happening!
2004 Boxster S, 60K, just installed new clutch.
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04-06-2012, 06:36 AM
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#2
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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DO NOT DRIVE THE CAR!!!!! Timing chain may have went or IMS could have gone. Unless you can absolutely tell it is exhaust DO NOT DRIVE! Keep us updated.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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04-06-2012, 06:41 AM
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#3
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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Called my mechanic, but he can not make it today (its a holiday over here), and he wants me to record the sound and e-mail it to him. Is it at least safe to start the engine?
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04-06-2012, 07:01 AM
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#4
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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Quote:
Originally Posted by rene525d
Called my mechanic, but he can not make it today (its a holiday over here), and he wants me to record the sound and e-mail it to him. Is it at least safe to start the engine?
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I wouldn't start it. The first thing i would do is take out the oil filter and see if there is any metal in it. If there is any metal, definitely do not start.
__________________
Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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04-06-2012, 07:02 AM
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#5
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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No, don't start it again.
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04-06-2012, 12:30 PM
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#6
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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AN update
Ok... so here goes an update. The mechanic managed to come and see the car and he told me that the noise is something external to the engine.... he is thinking it might be the belt. Will take the car to him tomorrow morning to troubleshoot further.
Last edited by rene525d; 04-06-2012 at 12:41 PM.
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04-06-2012, 02:54 PM
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#7
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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Video
With the mechanic on site, he needed to start the car briefly to identify the noise, so I thought might as well make a video to have it recorder- here you go.. Porsche Boxster S engine noise - YouTube Let me know what you think, you can hear the noise especially when i increase the RPMs.
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04-06-2012, 03:46 PM
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#8
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Registered User
Join Date: Jan 2009
Location: Boston
Posts: 188
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Please keep us posted. I'm thinking about you Man. Hope for the best.
I hate hearing this stuff.
__________________
-May all the roads you travel in life be Speed Trap free.
01 986 Boxster S. Arctic Silver. 6 speed manual. IMSR/RMS.
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04-06-2012, 04:12 PM
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#9
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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heh i wonder if I manage to go to sleep tonight... the fact that the sound is external makes me feel better somehow, but still im dead worried. Its the loudest at the right rear wheel well.
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04-06-2012, 09:48 PM
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#10
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Registered User
Join Date: Nov 2010
Location: Long Island, NY
Posts: 296
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Hm, sounds awful but that the engine idles and you can rev it is, imho, a good sign. I'd open up the engine cover behind the seats, gives you access to the serpentine belt and all that is driven by it. My guess it's one of the components on the serpentine belt that has thrown a bearing.
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04-07-2012, 03:34 AM
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#11
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Registered User
Join Date: Aug 2011
Location: Malta
Posts: 144
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Its the SYNCHRONOUS BELT ! Nothing major.
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04-07-2012, 11:11 AM
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#12
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Moderator
Join Date: Feb 2012
Location: DFW
Posts: 782
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Whew glad to hear. A drop in the bucket of bad things that could happen. 
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04-08-2012, 02:06 PM
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#13
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Registered User
Join Date: Jan 2009
Location: Boston
Posts: 188
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Sweet ! Glad to hear that. 
__________________
-May all the roads you travel in life be Speed Trap free.
01 986 Boxster S. Arctic Silver. 6 speed manual. IMSR/RMS.
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2000 Porsche Boxster
