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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 06-05-2015, 01:30 PM
bimmerup-sonny bimmerup-sonny is offline
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Location: West Hills, CA
 
Join Date: May 2013
Posts: 17
Mein Auto: BMW 335d
What are the symptoms for 335d carbon buildup?

Hi,

My '11 335d with 59K miles shows some engine stutturing, is this
an early sign of carbon buildup?

I also have the BTD adapter, I will take it out and see if that is the culprit.

In genneral, what are the symptoms for carbon buildup?

thank you
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  #2  
Old 06-05-2015, 01:37 PM
Hoooper Hoooper is offline
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Location: CA
 
Join Date: Jun 2013
Posts: 559
Mein Auto: 335D
rough idle, bad mileage, weak power. Rough idle and lower mileage being the most obvious
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  #3  
Old 06-05-2015, 02:18 PM
bimmerup-sonny bimmerup-sonny is offline
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Location: West Hills, CA
 
Join Date: May 2013
Posts: 17
Mein Auto: BMW 335d
Quote:
Originally Posted by Hoooper View Post
rough idle, bad mileage, weak power. Rough idle and lower mileage being the most obvious
I don't notice the bad mileage, but the rough idle gradually getting
rougher. I also have the JBD installed, will take it out this weekend.

What is the latest news on carbon buildup cleaning?
How much does it cost from dealer, and any shop in Socal that
forum members have used and reccommended for this service?

Thank you
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  #4  
Old 06-05-2015, 08:38 PM
KeithS KeithS is offline
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Location: Central NJ
 
Join Date: Dec 2001
Posts: 1,772
Mein Auto: '11 335d, '00 540iT
Poor mileage is the most prominent effect of CBU. I had zero symptoms of CBU until the SES light came on at 53K miles EXCEPT lower MPG. Then I had some occasional rough idle. Although I had an extended warranty, I believe it was actually covered under the factory warranty. But no dealer will do anything as warranty until the SES is on.

If you get an honest dealer who knows what they are doing, and your paying, it should be in the order of $1500 for cleaning.

For me the improvement in MPG was very noticeable after the cleaning. The diesel growl was a little louder and while improvement in power, it was not that much. My DEF usage also went down a lot due to better MPG plus I believe when they updated the DDE program the parameters were changed to use less DEF. It's been over 16K miles since last filled and no DEF warning yet.
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  #5  
Old 06-06-2015, 08:04 AM
bimmerup-sonny bimmerup-sonny is offline
Registered User
Location: West Hills, CA
 
Join Date: May 2013
Posts: 17
Mein Auto: BMW 335d
Quote:
Originally Posted by KeithS View Post
Poor mileage is the most prominent effect of CBU. I had zero symptoms of CBU until the SES light came on at 53K miles EXCEPT lower MPG. Then I had some occasional rough idle. Although I had an extended warranty, I believe it was actually covered under the factory warranty. But no dealer will do anything as warranty until the SES is on.

If you get an honest dealer who knows what they are doing, and your paying, it should be in the order of $1500 for cleaning.

For me the improvement in MPG was very noticeable after the cleaning. The diesel growl was a little louder and while improvement in power, it was not that much. My DEF usage also went down a lot due to better MPG plus I believe when they updated the DDE program the parameters were changed to use less DEF. It's been over 16K miles since last filled and no DEF warning yet.
I had a hard time maintaining idle when I started the car last night after work.
My SES light just came on as I drove home last night while going up hills

You said it is covered under Factory Warranty but yours was at 53K miles?

I don't see any MPG reduction, so I suspect it was not carbon build up,
so this morning I just took out the JBD... well I started the car right up, and let it idle
for 10 mins, and the rough idle is gone, and the SES light is also gone
after a few minutes.

Will drive it today and see if the symptom is gone completely.
I know the carbon build up will come soon, let's hope not too soon
BTW, minicorsa.com said they can clean it for $600, anyone used them
for this service before? I had my OEM Performance Suspension installed there,
and they did a great job
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  #6  
Old 06-08-2015, 08:00 AM
bimmerup-sonny bimmerup-sonny is offline
Registered User
Location: West Hills, CA
 
Join Date: May 2013
Posts: 17
Mein Auto: BMW 335d
Quote:
Originally Posted by bimmerup-sonny View Post
I had a hard time maintaining idle when I started the car last night after work.
My SES light just came on as I drove home last night while going up hills

You said it is covered under Factory Warranty but yours was at 53K miles?

I don't see any MPG reduction, so I suspect it was not carbon build up,
so this morning I just took out the JBD... well I started the car right up, and let it idle
for 10 mins, and the rough idle is gone, and the SES light is also gone
after a few minutes.

Will drive it today and see if the symptom is gone completely.
I know the carbon build up will come soon, let's hope not too soon
BTW, minicorsa.com said they can clean it for $600, anyone used them
for this service before? I had my OEM Performance Suspension installed there,
and they did a great job
Update:
I put on 80 miles on Sunday, and today my commute is 30 miles,
so after 110 miles, the car is running without any problems.. no more
rough idle nor starting up issue.

I can say with certainty that the JBD was the culprit, I will see if Burger Tuning
want this bad unit back for their R&D department.
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