[dixy2k]

That's what the shop foreman told me too. There is nothing I can do to avoid the problems. Bad design.

Maybe a different car.

[locolobo]

2009
335d Ecotune remap
40800
28.9 avg MPG
30.8 avg SPEED
5% Biodiesel Blend & Power Service additive - BP franchise. Cetane: 50
Drive type 4
67% City, 33% Highway

No carbon build up issues that I know of.

Bought with 32,300 miles in 4/2013. One previous owner in Texas.

[diaz92376]

Year: 2011
Model: 335d
Miles: 33k
Average mpg: 21.5
Average speed: not sure
Fuel: 76 sometimes chevron
Drive type: 3
Highway/City: 30/70
Carbon build up: Yes
Additional info: Bought the the at 9k was a dealer loaner and had build up at 26k I believe

[FormerRotor]

for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?

[335dFan]

Originally Posted by FormerRotor

for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?

I assumed it was the latter, but I suppose the OP needs to define it.

[chau]

Originally Posted by FormerRotor

for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?

My carbon build up was confirmed by the dealer while replacing my injectors.

[dixy2k]

I was told by the shop foreman that my car was all clogged up by soot deposits. I have no other way of knowing/confirming.

[diaz92376]

Originally Posted by chau

My carbon build up was confirmed by the dealer while replacing my injectors.

Same thing with mine and stayed at the dealer for almost 2 weeks.

[ficklerx]

Originally Posted by diaz92376

Same thing with mine and stayed at the dealer for almost 2 weeks.

Mine has exceeded 2 months!!

Anyone know why they choose to replace the intake instead of cleaning? I know it is plastic but disposable?

[dixy2k]

Originally Posted by ficklerx

Mine has exceeded 2 months!!

Anyone know why they choose to replace the intake instead of cleaning? I know it is plastic but disposable?

My guess is that the dealer can make more money through the warranty pay if they replace the "faulty" part, than cleaning it.

[r.carson]

Redesign of the CCV was what I was told...and it's cheaper for BMW to replace the parts...get the old ones, clean themselves and put back in rotation.

Again maybe lines I was fed.

[remi]

Year: 2011 (build date 7/11 - post EGR fix)
Model: 335d
Miles: 45k
Average mpg: 34.5
Average speed: 42 mph
Fuel: Shell diesel
Highway/City: 80/20
Carbon build up: No problem (might be there but no SES)

[Big_Daddy_38]

2011 335d

Almost 50,000 Miles

27.3 mpg, 35 mph (both averages of my typical drive)

Normally fill up at Speedway, don't know cetane

On a scale of 1 to 5 how hard do you drive? 2 or 3 depending on traffic

Highway/City Mix: 50/50

Carbon build up issue yes or no? YES

Additional Info:
Started to get limp mode about 43000 miles. Repair history:
1) thermal sensor was replaced (fall, 2013).
2) Limp mode again Jan 27, got car back Feb 25--REmoved cylinder head and sent out to remove carbon buildup.
3) SES came on 15 miles later, we'll see what they say now...

I'll post the codes when I get the car back.

[Robspages]

Hey everyone.

It's been just over a year since my last carbon-related SES. My 2009 335D is just about to hit 70k miles.

I truly believe my last trip to the dealer for carbon was due to extremely low fuel quality. After my first buildup post, I stopped using convenience store fuels (WaWa here in eastern PA, Cumberland Farms etc. up in New England) and stuck instead with Shell and Sunoco mostly.

Due to some particularly poor planning on my part, I found myself outside of my normal haunts and in need of fuel not once, but twice in a row! First time I grabbed a tank of WaWa diesel and when that ran out, I tried a Volero station. Not 200 miles after the Valero stop I got the SES. The corresponding trip to the Dealer resulted in a new manifold and several sensors. I posted the details of that trip last January (2013).

Since then, I have stuck to my Shell/Sunoco routine. I have also started adding Power Service 03080-60 Cetane Boost and Diesel Cleaner to the tank at fill-ups (http://www.amazon.com/dp/B001JT1FJ6?tag=deadt-20). My Mileage has remained about the same, power feels better and no carbon buildup for a full year of heavy (30k miles) driving.

Hope that helps. Happy motoring.

[BillyG335d]

Model year
2011 335d
33,000 miles
23 mpg Avg.
25 mph Avg.
Shell 40 Cetane
3 to 5
All City

No Carbon build up and no check engine lights! Mixture of Power Service Diesel Kleen Cetane Boost and LUCAS fuel injector cleaner at every fill up. May be switching to Opti-Lube. Co-worker with the same car just ordered it after reading good reviews and will be testing it out.

[Nushibo]

Model: 2011 335d (Build Date: 01/2011)
(EGR Fix at 18,249 Miles) Own for 8,249 miles at that point.
Current Mileage 46k
Average MPG - 30
MIX of everything + Biodiesel or Opti-Lube on most fills
Driving style 4.5
50/50 Highway City

CBU - None

Been good to me for about two years now.

[p27rpy]

2011 (2/2011 build date)
335D
Mileage: 44,600
Just purchased, so I have no information on fuel and driving style.

Carbon build up issue yes or no? Yes.

Additional Info:
I just purchased the car and took it to the dealer with an SES light and the common "red hose" oil leak. They found carbon buildup and are replacing the intake manifold under warranty as we speak. I'll update this post with all the repairs done when I pick the car up.

[335D 4JGB]

'09 335d USA model

Purchased used 71,500 mi.
Current Millage 85,500 mi.

MPG. 26.7
AVG Speed 32

Fuel: Propel Diesel HPR (High Performance Renewable) consists of 98.5% NExBTC renewable diesel

Carbon build up issues: Yes

Current Code reading: 4D01 Exhaust Backpresssure sensor
4CF3 Exhaust Backpressure sensor, Signal
4D03 Exhaust Backpressure sensor

Even with the service engine soon light on the car drive with the above MPG fine.
Current maintenance to turn light off: Replaced DPF,
Had codes read again as SEC light is
still on. One fault code showing.
Replacing Metering Unit with hopes
this resolves issue.

[mefferso]

Year: 2010 335d
Miles: 32,500 @ purchase and currently @ 81,000
Average mpg: 34.1
Fuel: varies
Highway/City: 70/30
Carbon build up: None as of yet. Only a few months left of CPO. So needs to happen soon if going to do it.

[Persian Whisperjet]

I'm at 61K no issues that I know of. Deletes since 50K.

[g335d]

2011, 81,000 miles. 75:25 highway to city ratio and I like to step on it when I can.

Usually fill up with Shell or BP diesel, especially after I had read the advice on the forums regarding high turnover stations with name brand fuel. Having said that, here in the Upper Midwest I think the diesel only comes from a couple of different refineries.

CBU cleaned out of intake per the pertinent SIB last week after SES light came on for MAF and NOx sensors. Got the car back yesterday and drove 65 highway miles home; no further codes for now and got 39 mpg on the trip.

[dokeeffe]

Originally Posted by pjuhlin

2009
335d
62,000 (Extended Warranty AUL)
Mpg 26.5
29 mls +-
Chevron
2.5
Highway 40% / City 60%

Carbon build up issue YES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Additional Info:
Fighting with BMW NA right now to fix problem. BMW NA claims its a maintenance issue but the car has been perfectly maintained through the dealership from day one (with service records to prove it). AUL warranty company will not cover the cost because they claim it is an emission problem. Cost to fix $4,800. BMW NA alongside dealership has only offered to pay a $1,250 towards repairs. This has been a bad deal all together and I have not had my car back for over 60 days!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Once I get this resolved I am selling it and will never buy a BMW again in my life no matter what! Even if I somehow win one in a contest I sell it immediately.

Bottom line: Stay away from 335d. You should not have to drive your car hard to avoid this problem.

I feel your pain! In SF Bay Area carbon cleaning costs 3k for a the diesel carbon and $750 on a gas E90. I commute daily on the freeway ~60miles. I am considering selling it and buying used e90 M3. But I should get Honda on a lease.

2011
335d
79,000
28mpg
60miles per day
Various types of fuel
3 driving style
70highway/30streets
Yes to carbon and emissions problems too