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rob001
Silverstone


Joined: 13 Jan 2011
Posts: 120



PostPosted: Sat May 04, 2019 3:19 pm    Post subject: In cabin rattling/ metallic noise around 2800 RPM Reply with quote

My friends 997 4s manual is making in any gear but best heard in 3rd around 2800 rpm a rattling, buzzing, metallic noise very noticeable in cabin coming from left side rear. The noise is only under a very light load/ feathering the throttle around 2800 rpm. Putting more load or WOT, no noise

Listening outside and on bridge in neutral impossible to pinpoint location.
Also difficult to say if the noise is internal or external.

Since the noise sounds typical like a loose heat shield, cat, exhaust and to rule out the usual suspects we changed out both exhaust, cats, heat shields, drove without belt, without rear bumper, checked all coolant, AC and fuel lines etc.

Some history to this, engine was dropped to replace coolant and rear break lines, changed plugs etc.

When using PIWIS and actuate the valve lift at around 2800 RPM almost same noise can be reproduced in neutral. Changed the solenoids and did not helped.
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Artic Silver X51 997 2S, manual
Sienna red BMW e46 325i with all M options available
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 04, 2019 3:32 pm    Post subject: Reply with quote

Sound clip if possible by someone sitting in the back of the car and moving the phone around when the nise is there might help .

Couple of things to check ..

Make sure all the cross braces are done up very tight .

check and reposition the engine earth lead .. i remember some bulletin about it causing noises when it touched the cam cover .

Check ALL pipes .. anything touching engine say a metal coolant pipe will transfer noises to the cabin .

i think the 2800 is just the required frequency of this vibration and not really the high lift activation .. that kicks in at about 3k - 3100 .

I assume this started after the engine drop ?
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rob001
Silverstone


Joined: 13 Jan 2011
Posts: 120



PostPosted: Sat May 04, 2019 3:43 pm    Post subject: Reply with quote

Hi DeMort, thanks for fast reply. The noise started a week after the engine drop. Tempting do drop again and double check everything!
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Artic Silver X51 997 2S, manual
Sienna red BMW e46 325i with all M options available
ex Basalt black 996TT K16/24, 5bar FPR, FVD DV, 100 cell Europipe, UMW tune
ex 993 C2 tip Iris Blue
ex 996 C2
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 04, 2019 4:13 pm    Post subject: Reply with quote

Focus on what was removed is what i would do so Any fixing removed .. brace bars etc and Any pipe or cabling .. something is providing a Hard connection from the engine to the body imho.
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Jam911
Albert Park


Joined: 31 Oct 2010
Posts: 1507



PostPosted: Sat May 04, 2019 5:15 pm    Post subject: Reply with quote

Corroded heat shields maybe?
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chowgar
Monza


Joined: 09 Aug 2014
Posts: 240
Location: London


PostPosted: Sun May 05, 2019 7:05 am    Post subject: Reply with quote

It could well be his water pump. I noticed a metal whirring noise a week ago, all of a sudden and coolant started leaking. A new pump and all was back to normal. The bearings in my pump had failed. Remember that a failed unit, doesn't always include the coolant leaking.
 
  
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