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Hot!Warm start up clatter

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KC__69
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2021/03/07 18:06:19 (permalink)

Warm start up clatter

Hi all 
After a bit of advice please....
 
I notice when starting my car 991.1 (GTS) after 30min -1hr from switching off after a run (so still warm)  it makes a clatter type noise for a couple of seconds then goes away and then sounds fine  (Chain or lifter?) 
Doesn't seem to do it from a cold start at all 
 
Is this something i need to get checked out ? .... I'm under Porsche warranty but wondered if this was considered fairly normal or needs a look at ....
 
Thanks 

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Dave jones
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Re: Warm start up clatter 2021/03/07 18:14:53 (permalink)
Could be the lifters . How many miles have you done 
KC__69
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Re: Warm start up clatter 2021/03/07 18:17:07 (permalink)
Hi Dave 
33000 
Done 3000 since last oil change ( 18 months ago) 
 
 
Motorhead
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Re: Warm start up clatter 2021/03/07 18:26:32 (permalink)
Hi Kevin,
 
Not a 991.1 but a 987.2 Cayman S with what is essentially the same DFI n-asp engine. My observations over more than 11 years of ownership:
 
  • Start car, let the idle settle and drive it out of the garage - bag of nails. Drive for 20+ miles - quiet as a mouse.
  • Start car, let the idle settle and drive it out of the garage - quiet as a mouse. Drive for 20+ miles - bag of nails.
  • Any combination of the above.
So your guess is as good as mine, but if you’re concerned then certainly it would be wise to let your dealer give the car the once-over, if only for your peace of mind.
 
Jeff

987.2 Cayman S
North Beds (R10 & R24)
KC__69
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Re: Warm start up clatter 2021/03/07 19:00:25 (permalink)
Thanks for your reply Jeff they are quite a rattly engine you right 
 
I wasn't overly concerned as it drives perfect, oil pressure is spot on and generally sounds very sweet
 
I was interested in other owners thoughts just in-case could be a problem brewing or not 
 
Service is due in September but if others felt was a known problem then would get in in to OPC ASAP 
 
Thanks 
 
 
 
Motorhead
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Re: Warm start up clatter 2021/03/07 19:58:13 (permalink)
Apologies for the rather flippant post Kevin but I was just indicating the sort of variation you can get with these F-6 engines. If you’re used to an in-line or V-engine in which the engine is encased  and the radiated sound can be absorbed to some extent, just be aware that the exposed block and heads of the boxer engine lead to radiated sound being reflected from the ground and out the sides, making it a rather noisy configuration.
 
The DFI engines tend to be characterised by tappet noise and an additional high frequency ticking from the fuel injectors. If you’re experiencing more of a short-duration clatter/thrashing noise emanating from the front of the engine (the rear of the car in your case) then it’s possible that one of the timing chain tensioners - of which there are quite a few - is slow to operate, but you’d have thought that would be more prevalent when the engine is cold rather than when it’s reached normal operating temperature.
 
Unless it’s really bothering you I would agree with your plan, while of course keeping a watchful eye on the situation.
 
Jeff

987.2 Cayman S
North Beds (R10 & R24)
Tony Warr
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Re: Warm start up clatter 2021/03/08 07:44:07 (permalink)
I have often noticed (991.1 TT from 24 to 42 K miles) a similar noise that I would describe as a tappet like noise for about 1 second on start up. Not always: maybe 1 in 5 starts. Like others it can be at cold start but more often at warm restart. I have asked at OPC and elsewhere but no diagnosis.
KC__69
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Re: Warm start up clatter 2021/03/08 21:03:46 (permalink)
Thanks Tony that's pretty much the same as I hear I think it's a tappet but seems fairly common 
 
If I turn it off (warm) then restart within minutes there is no noise ... 
 
Thanks for your comments 
mphillips
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Re: Warm start up clatter 2021/03/14 08:06:05 (permalink)
My 34,000 mile 991.2 Carrera S makes noises like you describe. It seems fine. Only recently had a service at an OPC too — so I don’t worry about it. Never have TBH 😃
KC__69
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Re: Warm start up clatter 2021/03/19 17:15:20 (permalink)
Thanks for the info Mark 
Spackers
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Re: Warm start up clatter 2021/03/21 08:52:46 (permalink)
I’ve a 991.2 S. 18000 miles. It clatters sometimes when started from cold. Good to hear others have it too!!  It’s been serviced and nothing found.  
911Time
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Re: Warm start up clatter 2021/03/23 09:50:15 (permalink)
I'm not saying this is the cause of your noise but I've also noticed that the exhaust flaps (with or without PSE) create a fair bit of chatter however, this tends to go away once the engine is up to normal oil temperature at c105-110 Degrees C and some of the operating tolerance has been taken up by expansion.
 
I agree with the general consensus that these are relatively noisy engines - certainly when compared to most modern engines, which tend to be shrouded in plastic and sound deadening.

Mark
Member: 141540
2013 991.1 4S with a few 'Special Bits'
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