24678923

Can anyone tell me if this sounds like piston slap/bore scoring? 2008 Cayenne GTS, <100k miles. That BaT post has me concerned cause I can't really hear anything notably different from my engine...

brett968

I don't hear any piston slap--certainly nothing like the car in the recent BAT auction. I think you're OK but a video with the camera further away from the engine would make it easier to say that with more confidence. When the mic is too close it's hard to pick out piston slap over all the valve train noise, injector noise, induction noise, etc.

24678923

Thanks a bunch...that periodic toctoctoctoc noise is not piston slap then? Glad to hear it...was reading in the other thread it mostly affects up to 2008s too. I just bought it but without a prepurchase inspection so I'm on the lookout for karmic retribution for that haha. It's been into a Porsche specialist since and was ok'd by them.

TomF

Sounds pretty good to me but I agree with Brett that holding the camera a bit farther from the engine and hold it in place for a few seconds would be helpful. As an experienced Cayenne engine builder once told me, these engines are a bit noisy...and with the normal injector noise on top of it all, it is sometimes hard to discern a problem without a stethescope.

Jfrahm

Also I'm not sure I've heard of scoring in a GTS engine, and I do not think that engine is on the list Porsche provided.

v10rick

Sounds like my GTS...for the past 6 years.

TomF

Hi Joel, I am afraid this is incorrect. I certainly would love it to be the case! Regrettably, there have been cases of the 4.8 NA engine suffering from scoring.

I am not sure what list you are referring to, unless you are speaking of the TSB 25/13 ENU 1010 Jun 20, 2014 that I and others have referenced several times on this board... If that is the one you are referring to, it does include the 4.8 NA engines, although not specifically (but by reference) the GTS iterations.

TRINITONY

And scoring is even showing up in the Pannys, both 6 & 8 cyls, Macans and 958 Peppers...

TangerineT

Volkswagen-ification of Porsche. Very unfortunate for the brand. Just a number of things that likely would have never been an issue with Porsche as a stand-alone company. Any longer it seems it's just another brand that is part of the largest automaker in the world.

Jfrahm

I've seen examples of the 'S' engine listed as having been scored but I'm not aware of a GTS engine. Are you? The TSB does not mention the GTS, which has a different engine number range from the S although both are "Type 4801".

Davebrossi

Yeah, the Volkswagenation of the company is why my 957's my last. Just too many 'that'll do' engineering decisions, from the coolant distributor at the back of the block (we can use epoxy!) to bore-scoring (always user error, even when it's not!) and a million other things that just infuriate because it was hidden under a badge we all generally agree to liking.

24678923

you complain about volkswagenification yet you have a 914 and a Cayenne? lol

Let's not pretend like 'core' Porsche didn't have problems e.g. IMS bearing

Davebrossi

I do have a 914; the Porsche parts on it are great. The Volkswagen pieces, however, are why it's currently dismantled in my garage since I have a space problem I cannot overcome to weld a rotisserie together, mount the body, and properly replace the metal. In general, Volkswagen working with Porsche has led to something....not so great outcomes. Karmann seemed to like to use railroad pig iron in their bodies. The 924 was...a thing (and the 931 is a favorite, even if mine was junk.) Porsche has had weird engineering issues, this is true *cough*chaintensioners*cough* but other than just being German, you could live with the suck because of the rest of what you got. I'm just salty because I'm going through what piston slap translates to, that's all.

Turbodan

Porsche has had engine engineering problems for decades. look at the magnesium blocks that leak through the engine case, look at ....oh tonnes of examples, even including exclusive GT3 engine stop sale replacement. I don't have time to list many now

Davebrossi

One day, the trans-axel on my 987 just went 'aslpode. Never did figure out why. That 957 bit applies to the p!G hopefully after many years on the rebuilt block. As for the company in general, I tried to live without the aggravation for a few years, didn't stick. My 914 -will- get there, albeit with a lot of Restoration Design metal in place. Only Porsche could get me to go to night school to learn to weld for a VW/Porsche cross over that came from the factory rusted. Could be worse...could be an MGB. I already get funny looks describing the tensioning process on the fan belt of an Air Cooled flat six.