Carbon Build Up Question.

[whoop_ass]

All new Gen VAG cars have actually addressed this issue with port and DI

still don't know how BMW has not jumped onto that as well

[Ian1973]

Originally Posted by GBPackerfan1963

Most of the time if you drive the car like you stole it, carbon build-up will be a non-issue.

I assume your emoticon is because you know that is not the correct answer. Your driving will NOT effect carbon build up on a DI engine.

In theory this engine would have the same issues any DI engine would, but I read somewhere it has work arounds that prevent it. Hard to know until more get higher mileage. I'm at 45,000 miles and I'm noticing some stumbling and stuff I never had before, which could be build up.

[Ian1973]

Originally Posted by Jockey

Speaking of, I need to get my valves cleaned but my local dealer quoted me $1400

Another dealer quoted me half that which is still high. I don't understand how one dealer is 2x the price of the other. You would think it would be a standard price. Time to find an indy shop that will do it.

500 bucks for my N54 335i at the local BMW dealership. I noticed rough running and hesitation and threw a code.

[Ian1973]

Originally Posted by voodoogeek

I had this after 4 years on a October 2008 335 coupé. first the fuel injection pump caused problems every 10k miles, until they eventually changed the parts after the fifth occurence. then 1 year later they tell me that there's a massive carbon buildup and they had to replace half of the engine. my luck I was under extended warranty, the parts alone were 11k swiss francs... sold it a couple of months later, to order the M4

How exactly do you replace half the engine? How would carbon build up cause any type of failure? It just causes hesitation and rough running and will throw a code.

[Powerslide]

Originally Posted by Ian1973

I assume your emoticon is because you know that is not the correct answer. Your driving will NOT effect carbon build up on a DI engine.

In theory this engine would have the same issues any DI engine would, but I read somewhere it has work arounds that prevent it. Hard to know until more get higher mileage. I'm at 45,000 miles and I'm noticing some stumbling and stuff I never had before, which could be build up.

Originally Posted by Ian1973

I assume your emoticon is because you know that is not the correct answer. Your driving will NOT effect carbon build up on a DI engine.

In theory this engine would have the same issues any DI engine would, but I read somewhere it has work arounds that prevent it. Hard to know until more get higher mileage. I'm at 45,000 miles and I'm noticing some stumbling and stuff I never had before, which could be build up.

I doubt the stumbling is due to carbon buildup - I had almost 60k miles on my 2015 F80 before trading it in for my 2018 ZCP F80 - my 2015 felt just as powerful as always right up to the day I traded it...

[DanMpower]

Originally Posted by whoop_ass

All new Gen VAG cars have actually addressed this issue with port and DI

still don't know how BMW has not jumped onto that as well

Well considering Lexus had it figured out back in 2006 with the IS350, both port and DI, I guess both VAG and BMW are late to the party.

[MRV99]

Please do not be fooled into thinking these companies did not know the effects of DI and carbon buildup. These companies were focused on emissions and MPG not the carbon build up after the car has been certified by the Govt.

[Ian1973]

Originally Posted by Powerslide

I doubt the stumbling is due to carbon buildup - I had almost 60k miles on my 2015 F80 before trading it in for my 2018 ZCP F80 - my 2015 felt just as powerful as always right up to the day I traded it...

Sorry should have specified, the stumbling was on my N54 335.

I'd love to know what you got for you car in trade with that many miles as I am racking up the mileage in an alarming fashion as of late and am worried about resale.

[Ian1973]

Originally Posted by MRV99

Please do not be fooled into thinking these companies did not know the effects of DI and carbon buildup. These companies were focused on emissions and MPG not the carbon build up after the car has been certified by the Govt.

And don't forget, they can get extra power out of DI.

[fabulousprofound]

as a past owner of a mk5 fsi gti, is a great relief to see that this engine does not suffer from carbon buildup... i still remember the mechanic calling me into the service bay to show my valves were clogged solid and you couldn't even see the valves anymore, and then gave me a $700cdn estimate to fix. back then they were using a pick to chisel it out. those were dark times for me

from google:

[F32Fleet]

Originally Posted by whoop_ass

All new Gen VAG cars have actually addressed this issue with port and DI

still don't know how BMW has not jumped onto that as well

BMW figured it out by building a better air/oil seperator.

Unlike the N54 high mileage N55's are not suffering from significant buildup.

[HPIA4v2]

Originally Posted by DSTR

The valves were clean as noted in my post. I change at 15000km's. The M235i is driven daily as my M2 is as well. Short and longer durations, city etc. My mechanic is not dealing carbon as an issue with N55 overall.

as far as carbon build up on BMW, it's been documented in N54 and N63 engines.

[corbs09]

I just spoke with my tech (good friend) and he said on the newer n55 and s55 motors this has not been a major issue. He stated he had not had to do a valve cleaning on an s55 car to date.