Left exhaust tips going black

[JCKST1]

I have a 2005 997 S, in December the engine was re-built this included;

All cylinders re-lined
Pistons 6, 5 & 4 replaced
All piston rings replaced
Oil fed IMS
plus a few more odd jobs

Just last week it had a new coil pack fitted.

However I have noticed the left hand side exhaust is going black on the tips, I know this is commonly due to the bore scoring but surely not after 7 months of use and even this its minimal use, probably 1500 miles. I always make sure the car is up to temp before giving it some stick and never over rev it in 1st gear.

Unfortunately the re-build was done by the previous owner (under warranty from Portiacraft) and it's only valid for him so I cant even take it back to them.

It drives fine and I haven't noticed excessive oil use however I have only had it 3-4 months now.
Should I be worrying??

[JCKST1]

I will give Portiacraft a call and see what they say, it doesn't state where the work was carried out but judging by their website they do majority of it in house as they have two Porsche trained mechanics?

[JCKST1]

I haven't noticed anything, also when it was at the Porsche specialist they gave it a good check over last week and never noticed anything.

I will get a pic of it tomorrow to show you.

[JCKST1]

Portiacraft said all the work was carried out in house and that they have never had any problems with the liners, pistons etc used on the build.

I will keep a close eye on it and hope that its normal...

[JCKST1]

Here is a couple of pics, the car was cleaned last Friday. I intentionally cleaned both exhaust tips so I could monitor them, as you can see the left side has a lot more black on it then the right. This is after approx 100-130 miles use, its my second car so when its out and warmed up it does get some stick.



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[JCKST1]

I will check the oil tomorrow and see whats in at the moment. I have noticed that when starting and you get the oil check gauge on the dash it varies a lot. Sometimes it can show one bar and then the following day 3/4 full?

My local Porsche specialist maybe able to borescope it. I bought the car in March/April and noticed this after about a month however it was when washing I first noticed and it's constantly coming back once cleaned off the exhaust.

[JCKST1]

Sorry for the late reply guys, I have just seen this.

Thanks a lot for the info, really appreciated.
Here is the exhaust after another week or so, the car is still running fine but the black soot continues to build up.

Its going in for a full detail tomorrow so I will monitor it again over a couple of weeks and see if I notice any improvement.
If not what do you think the best stage of attack it?

Possible AOS sensor and oil change?


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[JCKST1]

Thanks guys. I am hoping it is a simple solution, running rich makes sense and did cross my mind.

There is a garage local to me who do re-maps but on a proper level not these £100 job and knock things.
I might try calling them to see if I can get it on their rolling road and see what comes of it.

Is it something what could be altered electronically or is it more of a mechanical thing? sorry for the simple question!

[JCKST1]

harleywilma said:

Get rid its going to blow up ,we all know what soot means on here. Its Doooommmed I telll yeee...

My thoughts exactly