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Old 02-18-2014, 03:16 PM   #1
Raymond Au
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carbon build in engine

Anybody heard of carbon build up in engine?
I have a 2009 335d with <7k. I love the car, it's powerful and save gas. But the dealership is saying I have carbon buildup in my engine. It'll cost >$2k to clean. I was so surprised and asked why this happened. The answer was may be I didn't drive the car enough. I find it hard to believe.

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Old 02-18-2014, 03:43 PM   #2
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you can ususally clean out carbon buildup just by going out and beating on the car for a while. find some teenager who can drive and you trust and let them take the car out for an hour
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Old 02-18-2014, 09:41 PM   #3
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That was gunna be my idea...works for me!
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Originally Posted by propr'one View Post
you can ususally clean out carbon buildup just by going out and beating on the car for a while. find some teenager who can drive and you trust and let them take the car out for an hour
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Old 02-18-2014, 10:10 PM   #4
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Let me guess.... you're getting Check Engine Lights. Besides the carbon build up, the Urea Tank level sensor is messed up....
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Old 02-18-2014, 11:56 PM   #5
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On a more serious note, bwm will do 1 of 2 things, clean via a kit or remove heads completely. For $2k not sure what they are doing, either over charging you for a clean with the kit or what because they would never remove the head and clean it for that price I bet.

We had a M5 in recently and they did the clean via the kit and charged him $1200, problem still existed so next step was heads off!

We also did a cleaning on a 645i. Carbon issue's are very common on the V8's, haven't seen a lot of it personally on the I6 but it is possible.

The best and only true way to clean a real carbon build up issue is head(s) off, period. No seafoam or angled brushes and cleaner will remove the hard spots and valves. The valve train is an issue that we are starting to see more of on the e90's followed by other associated issues that one should set aside $3k for to tackle when buying used should problem arise.

Bottom line, do it right or pay twice.
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Old 02-19-2014, 01:35 AM   #6
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Old 02-19-2014, 07:08 AM   #7
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definitely needs to be taken for a cleansing rip to blast out the cob webs
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Old 02-19-2014, 08:35 AM   #8
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I had suspected carbon build up in the head on my E36 5 years ago and was told the only way to fix it was to to remove and clean. My alternate option was to install a used S50 for about the same price which is what I did I drove the car hard on a regular basis, so slow urban driving wasn't the issue. For your low mileage diesel, you really only have the cleaning option.

Carbon build up seems to be an issue with BMW engines. Esp. with the E39 M5 (one reason why I lusted but never bought one). The last time my E90 335i was in for service, the dealer recommended a cleaning service which was only a few hundred dollars. I didn't get it done, but after hearing this, I'm leaning towards getting it done.


Quote:
Originally Posted by Blackedout95 View Post
On a more serious note, bwm will do 1 of 2 things, clean via a kit or remove heads completely. For $2k not sure what they are doing, either over charging you for a clean with the kit or what because they would never remove the head and clean it for that price I bet.

We had a M5 in recently and they did the clean via the kit and charged him $1200, problem still existed so next step was heads off!

We also did a cleaning on a 645i. Carbon issue's are very common on the V8's, haven't seen a lot of it personally on the I6 but it is possible.

The best and only true way to clean a real carbon build up issue is head(s) off, period. No seafoam or angled brushes and cleaner will remove the hard spots and valves. The valve train is an issue that we are starting to see more of on the e90's followed by other associated issues that one should set aside $3k for to tackle when buying used should problem arise.

Bottom line, do it right or pay twice.
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Old 02-19-2014, 09:02 AM   #9
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Originally Posted by Raymond Au View Post
Anybody heard of carbon build up in engine?
I have a 2009 335d with <7k. I love the car, it's powerful and save gas. But the dealership is saying I have carbon buildup in my engine. It'll cost >$2k to clean. I was so surprised and asked why this happened. The answer was may be I didn't drive the car enough. I find it hard to believe.

Raymond Au
A 2009 diesel with 7k? You just simply bought the wrong car, so yes believe it that you didn't drive enough.

Diesel's are more efficient when they're up to operating temps, but they take (much) longer to get there.

Modern diesels during the warmup cycle use EGR and other technologies to curb emissions but in your case it sounds like you do small/short trips, that's bad enough on a gasoline engine but farrrr worse on a diesel motor.

So you probably have a large build up of soot in your intake and EGR valves.

There is more to just buying a car, you need to understand why the car you bought is a good fit for YOU and your driving habits.
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Old 02-19-2014, 09:49 AM   #10
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^ Soot isn't a big issue these days with ULSD, but the short trips never allow the motor to heat up properly to burn off the blowby. To put your application in perspective, the 2009 X5d in my family already has 120k on it....it does receive an italian tuneup daily though so no carbon issues. Urea tank heater though, that's another can of worms.
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Old 02-19-2014, 10:11 AM   #11
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Originally Posted by kenmar View Post
Carbon build up seems to be an issue with BMW engines. Esp. with the E39 M5 (one reason why I lusted but never bought one). The last time my E90 335i was in for service, the dealer recommended a cleaning service which was only a few hundred dollars. I didn't get it done, but after hearing this, I'm leaning towards getting it done.
Carbon build up is even a bigger issue on the 335i due to direct injection.
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Old 02-19-2014, 12:39 PM   #12
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Originally Posted by Axxe View Post
^ Soot isn't a big issue these days with ULSD, but the short trips never allow the motor to heat up properly to burn off the blowby. To put your application in perspective, the 2009 X5d in my family already has 120k on it....it does receive an italian tuneup daily though so no carbon issues. Urea tank heater though, that's another can of worms.
Soot is absolutely still an issue, not everyone uses good diesel fuel in their cars and ULSD isn't anywhere near the levels like specified in Europe.
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Old 02-19-2014, 02:40 PM   #13
Raymond Au
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Thanks, dealership is willing to share the cost, so after cleaning, I have to start going on hwy more.
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Old 02-19-2014, 03:22 PM   #14
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Carbon build up is even a bigger issue on the 335i due to direct injection.
Yea I was going to say, wait till you learn about walnut blasting and all that...

Hearing those stories makes me happy the S65 doesn't have DI, but then again it probably would be more fuel efficient and make more power if it did.
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Old 02-19-2014, 03:53 PM   #15
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Raymond..... Is that 7,000 km or 70,000 km?
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