[Puerto Rican 335d]

1) e90 Post Handle= Puerto Rican 335d
2) Model Year= 06/2011(Custom Built)
3) Mileage= 36,000
4) SES encounter (i.e. MAF, Misfire, Injector, DEF)= EGR replaced, NOX Sensors(FWD& AFT) Urea Critalization, DEF Tank and PUMP destroyed!!
5) Confirmed Carbon Build Up (Y/N) No, I have as of yet either seen or encountred i use additives alot!!!!

[F32Fleet]

Socom
2010
55,500 miles
No engine related SES
N/A

[Jhayd11]

Originally Posted by mact3333

I voted no also..my 2010 had 49K with no carbon issues...my 2011 has 40K on it and no known issues although I have only owned the car for 2 weeks...guess I shouldn't have voted either.

I think its useful for everyone to vote imho cause I would like to see the %'s no matter how many miles is on the car...werent they only made in 10 and 11' so many of them have a decent amount of miles on them I would think.

MACT, these numbers are helpful as well, however we just want to see the ones that actually have put in the miles to build up the carbon. It looks like this is something that hits at around 60k miles (as SOCOM put, CBU is common in diesels). My hope here is to document how long anyone is lasting.

The guys on this forum all LOVE this car. Including me. I sold mine, but can't stop LOVING it. I am hoping to get everyone paying attention to the issue and making sure we get some legitimate details about when it happens and when we should be having tech's look at our engine.

I now know if anyone has an MAF error, misfire error, or injector error code, they should have this diagnosed, prior to paying out for any replacements. Shops jump to quickly to fixing the sensor that reported the error, then if it comes back actually diagnosing the engine themselves. If you have these error codes and are lucky enough to still be under warranty, demand it be checked prior to you going over.

Again, the point I am trying to push to BMW is not a suit or anything, but we all have a VERY expensive vehicle check up at 55k (out of service warranty) and if you are like me, paid it with out question expecting all systems to be green lit. They need this checked at the 55k mark, and apparently manually as their is no system to help report it.

[dixy2k]

It's really ironic how many of these problems happen almost as soon as the car is out of warranty.

[acewiza]

Originally Posted by dixy2k

It's really ironic how many of these problems happen almost as soon as the car is out of warranty.

I don't understand that statement. Looks like affect bias to me. The vast majority of the extremely small sample of all 335D owners posting in this thread are not reporting the problem. The numbers for warranty aspects are not even given at all.

[dixy2k]

The warranty expires at 50k mile.
The problems we are discussing here tend to happen after the 50k mile mark.

[Jhayd11]

Originally Posted by acewiza

I don't understand that statement. Looks like affect bias to me. The vast majority of the extremely small sample of all 335D owners posting in this thread are not reporting the problem. The numbers for warranty aspects are not even given at all.

I am keeping a very close eye on the "votes" in the poll. 6 of the 17 "No's" do not quality as they have either a non U.S. car, they do not have a 335d (330 drivers) or have only 20-30k miles).

Based on that, we are looking at a near 50/50 poll.

There is only one guy in the "no" category that might have an 09 with considerable miles, but he did not state is MY or his total Miles. Right now the best example of long term driver with no issues is SOCOM, at under 60k. UPDATE: Floyd has actually beat SOCOM, with a 2010 with nearly over 70k and no CBU.

As for the warranty statement, there is a reason manufacturers put time and mileage limits on their warranty. It's expected that things need more support, including phones, cars, computers, and other things. BMW has an excellent option, and for the most part the cars are in near top order at the end of their warranty. I just don't think that is the case with CBU and needs to be checked by the dealerships at regular intervals.

I paid $3k to replace an ENTIRE radiator because a sensor was reporting an issue (on my 328i). That sucks, but is something most BMW owners can swallow.

[Hoooper]

Hoooper
2010
70,000
none (only issues to date, early in its life the nav unit was replaced under warranty at less than 10k miles)
confirmed no real build up

should have included the average speed question and how hard driven question in here for reference.

Ave: 44 MPH
driving style: typically 2, with probably once a week or so back roads and 5 stars for 20-30 mins

[acewiza]

Originally Posted by dixy2k

The warranty expires at 50k mile.
The problems we are discussing here tend to happen after the 50k mile mark.

Problems of all kinds happen with vehicles of all kinds at increasing rates the longer they are driven.

Exactly what makes your statement correlate to a warranty limit WRT this particular problem compared to any other possible mechanical problem that might crop up - not to mention the large number of cars under various extended warranties?

[acewiza]

Originally Posted by Jhayd11

I am keeping a very close eye on the "votes" in the poll. 6 of the 17 "No's" do not quality...

If that's case, there should be a way for you to reject those votes because it makes for a very misleading top line graphic and basically defeats the purpose of getting a "BETTER" poll.

[dixy2k]

On the first page the OP mentioned about 7 other owners with issues on their cars. Maybe those can be added to the poll.

[Jhayd11]

Originally Posted by dixy2k

On the first page the OP mentioned about 7 other owners with issues on their cars. Maybe those can be added to the poll.

Dixy2k, I am taking count of the owners that say yes and not in the poll as well as the posters. Some of the no's are not in our "sample? due to them not being 335d's, US based, and/or way to young.

Ill post an update when I can. I am hoping to get some more "no's" to be honest, because it is much easier to hunt down the "yes's" in the forum base on their cry's for help.

[Hoooper]

Its still obviously going to be very misleading. You would need to actually do a survey of 335D owners across the country including those NOT on the forum. If you pay attention to some join dates it is clear that many sign up to the forum when they have an issue (carbon build up, DEF tank, etc), but those people would have never signed up if they did not have an issue. For this to be accurate you would have to rule out every owner whose sign up date is close to the date they reported carbon build up and only count votes from owners who joined the forum before any issues developed

[acewiza]

Originally Posted by Hoooper

Its still obviously going to be very misleading.

The more I think about it and considering your remarks above I agree 100%.

There's no getting away from "the Internet effect." Even the most carefully controlled poll is still subject to the limits of it's sampled population, and a web forum is a poor substitute for a good sampling of car owners. Hell, you can't even reliably predict what small percentage of the total population is represented by forum members, regardless of their position on the issue in question.

[Jhayd11]

Originally Posted by Hoooper

Its still obviously going to be very misleading. You would need to actually do a survey of 335D owners across the country including those NOT on the forum. If you pay attention to some join dates it is clear that many sign up to the forum when they have an issue (carbon build up, DEF tank, etc), but those people would have never signed up if they did not have an issue. For this to be accurate you would have to rule out every owner whose sign up date is close to the date they reported carbon build up and only count votes from owners who joined the forum before any issues developed

Hooper, and everyone else. This is not a poll to document percentage of failures or have hard evidence of a class action law suit. I shouldn't have put the poll at the top and which I could delete it.

What I am trying to do here, is highlight in this forum how many have had it, when they had it and what was the first signs.

My letter to BMW, which has already been sent, is simply asking for a more proactive approach to catching CBU and suggesting treatment, before it is a car debilitating issue. My last major scheduled maintenance was only 7k miles before the entire car shut down. If I was the only one that had a problem near the 60k mark, fine. But I am not.

I have had Mini'd and BMW's and post on the forums all my issues. The difference here is the consistency of the issues.

Mini had a misfire, $1500
328i had a radiator issue $3000

That sucks but in both issues, when I posted my concern and request for guidance there weren't eight threads with the exact same problem.

Go around to the other threads, tell me if you see one other engine in this forum that is plagued with the same postings as much as this.

Then go to all the other engine forums and see how many of them talk mostly about ECU upgrades, something North America 335D's can't do, but you can with other 335D's. Why is it this issue is so persistant; BMW has no guidance and can't fix it themselves; and is putting unreasonable effort to preventing us from trying to fix it ourselves.

[Hoooper]

Originally Posted by Jhayd11

Go around to the other threads, tell me if you see one other engine in this forum that is plagued with the same postings as much as this.

Then go to all the other engine forums and see how many of them talk mostly about ECU upgrades, something North America 335D's can't do, but you can with other 335D's. Why is it this issue is so persistant; BMW has no guidance and can't fix it themselves; and is putting unreasonable effort to preventing us from trying to fix it ourselves.

nobody is trying to say there isnt a problem, even though it might look that way to you, just that polls like this on the forum dont mean much on the grand scale of the platform.

[Jhayd11]

Especially when half the votes coming in are not reading the OP before voting and skewing the small sample I was attempting to gather.

[17:1]

There is only one guy in the "no" category that might have an 09 with considerable miles, but he did not state is MY or his total Miles. Right now the best example of long term driver with no issues is SOCOM, at under 60k. UPDATE: Floyd has actually beat SOCOM, with a 2010 with nearly over 70k and no CBU.

I had them both beat two days ago with 115k without CBU. I did not want to put my name in the hat yet since I don't have a diagnosis for my SES light yet.

[Jhayd11]

17:1, I am inclined to think its not CBU. I am betting you run long enough, considering your miles, to not have an issue.

@ 120k BMW has a lot of long wear items to replace, so I am banking on it being one of those.

[acewiza]

71k - hello?!

[Hoooper]

Originally Posted by 17:1

There is only one guy in the "no" category that might have an 09 with considerable miles, but he did not state is MY or his total Miles. Right now the best example of long term driver with no issues is SOCOM, at under 60k. UPDATE: Floyd has actually beat SOCOM, with a 2010 with nearly over 70k and no CBU.

you didnt read my post then, since I posted 2010, 70k miles, and CONFIRMED no carbon build up.

[17:1]

Originally Posted by Jhayd11

17:1, I am inclined to think its not CBU. I am betting you run long enough, considering your miles, to not have an issue.

@ 120k BMW has a lot of long wear items to replace, so I am banking on it being one of those.

I hope you are correct. I will say that it would be very sudden if it was CBU. I had no prodrome at all.