[Mrchntmarine]

So here's the latest - left 3 messages for the dealer with no response back. I just called back and here's why they said - they have removed the intake manifold and sent it out to get "boiled and cleaned". I asked if there was anything I can do preventatively now to avoid future problem while the car is apart and was told no, nothing I can do and that the only thing that would help is to take the car out every 3-4 weeks and open it up at 70-80mph for 20-30 minutes.

[floydarogers]

Originally Posted by Mrchntmarine

So here's the latest - left 3 messages for the dealer with no response back. I just called back and here's why they said - they have removed the intake manifold and sent it out to get "boiled and cleaned". I asked if there was anything I can do preventatively now to avoid future problem while the car is apart and was told no, nothing I can do and that the only thing that would help is to take the car out every 3-4 weeks and open it up at 70-80mph for 20-30 minutes.

They (BMW and their service people) keep saying that, but at least some people that do still have CBU problems.

Make sure that, in addition to sending out the manifold, they walnut-blast the intake ports in the head.

[Hoooper]

Originally Posted by Mrchntmarine

So here's the latest - left 3 messages for the dealer with no response back. I just called back and here's why they said - they have removed the intake manifold and sent it out to get "boiled and cleaned". I asked if there was anything I can do preventatively now to avoid future problem while the car is apart and was told no, nothing I can do and that the only thing that would help is to take the car out every 3-4 weeks and open it up at 70-80mph for 20-30 minutes.

The dealership is not telling you the whole truth, and is telling you nonsense as well. You can prevent the soot buildup with an EGR block, and you can make it even better by enhancing the CCVs ability to filter oil before it goes into the intake. The part about driving the car on the highway to help is nonsense. It would maybe help if you did all your driving on the highway because people with highway commutes seem to have less buildup, but adding more miles for buildup to occur doesnt help.

[Mrchntmarine]

Originally Posted by floydarogers

They (BMW and their service people) keep saying that, but at least some people that do still have CBU problems.

Make sure that, in addition to sending out the manifold, they walnut-blast the intake ports in the head.

sorry for the question here, but not sure what you're referring to - the pic below or the part that they removed? Tks!!

[Hoooper]

Originally Posted by Mrchntmarine

sorry for the question here, but not sure what you're referring to - the pic below or the part that they removed? Tks!!

Those are the ports to be walnut blasted. The round ports directly above there also need to be cleaned.

[Mrchntmarine]

Originally Posted by Hoooper

The dealership is not telling you the whole truth, and is telling you nonsense as well. You can prevent the soot buildup with an EGR block, and you can make it even better by enhancing the CCVs ability to filter oil before it goes into the intake. The part about driving the car on the highway to help is nonsense. It would maybe help if you did all your driving on the highway because people with highway commutes seem to have less buildup, but adding more miles for buildup to occur doesnt help.

I agree with you - I have heard both arguments and tend to agree with what you're saying. A simple run on the highway I think will not burn it out, blow it out or make the problem less of an issue. However I can see where mostly highway driving will lessen the issues. BTW, do gasoline engines have this CBU problem? PM me if you don't mind - I don't want to hijack my own post!!

[Smonkey09]

Originally Posted by Mrchntmarine

I agree with you - I have heard both arguments and tend to agree with what you're saying. A simple run on the highway I think will not burn it out, blow it out or make the problem less of an issue. However I can see where mostly highway driving will lessen the issues. BTW, do gasoline engines have this CBU problem? PM me if you don't mind - I don't want to hijack my own post!!

Yes, direct injection BMW engines all have this issue. For gasoline, the issue appears to be because gasoline, which acts like a solvent, no longer passes the intake valves (since the gasoline is now injected directly into the cylinder), thereby it is not able to "wash" the valves.

Diesel CBU is worse because of the intake manifold design. Diesel intakes need to be more complex in order to allow for air turbulence necessary to mix air/fuel in cylinder head (which is why we have both a tangental and swirl port, and flapper valves to control which ports are used at various ratios at different RPMs). In addition, the EGR valve/cooler that is on diesel recycles oily, dirty exhaust gases back to the intake, which builds up carbon over time.

The walnut blasting procedure on a gasser is much, much simpler.

[DWR]

Quite simply, diesels can run with significantly higher ratios of ERG than gas vehicles. To do that requires some pressure. Therefore exhaust gases are taken before the DPF. Low pressure systems, with exhaust taken after the DPF, are much cleaner. But it is the combination of oily vapours from the crankcase ventilation and soot from the exhaust that cause the problem.

[ingenieur]

Originally Posted by Mrchntmarine

So here's the latest - left 3 messages for the dealer with no response back. I just called back and here's why they said - they have removed the intake manifold and sent it out to get "boiled and cleaned". I asked if there was anything I can do preventatively now to avoid future problem while the car is apart and was told no, nothing I can do and that the only thing that would help is to take the car out every 3-4 weeks and open it up at 70-80mph for 20-30 minutes.

Make sure the DDE gets programmed with the latest software so the crankshaft incremental wheel adaptations can be cleared with ISTA.
This allows the zero-mass adaptation to re-calculate correctly and prevents unnecessary injector and DDE replacements due to zero-mass faults which used to set after the CBU repair.

[floydarogers]

Originally Posted by Mrchntmarine

sorry for the question here, but not sure what you're referring to - the pic below or the part that they removed? Tks!!

The intake manifold has two sets of ports on it. What you've shown is the tangential ports that are directly in the head. There is another set of swirl ports that send air to the head cover and then into those ports (or something like that.)

There's a picture of the intake manifold on Page 28 of the "Advanced Diesel with Blue Performance" document - search for it.

[Mrchntmarine]

Originally Posted by floydarogers

The intake manifold has two sets of ports on it. What you've shown is the tangential ports that are directly in the head. There is another set of swirl ports that send air to the head cover and then into those ports (or something like that.)

There's a picture of the intake manifold on Page 28 of the "Advanced Diesel with Blue Performance" document - search for it.

Awesome article - thanks for the tip

[Mrchntmarine]

Originally Posted by ingenieur

Make sure the DDE gets programmed with the latest software so the crankshaft incremental wheel adaptations can be cleared with ISTA.
This allows the zero-mass adaptation to re-calculate correctly and prevents unnecessary injector and DDE replacements due to zero-mass faults which used to set after the CBU repair.

So I asked them about updating the DDE and they told me nothing needs to be updated because they did not replace and modules.

[Mrchntmarine]

update, update - finally got a call form the dealer and now in addition to the cleaning of the intake manifold they are also going to walnut blast the engine but do not have to do and updating of the DDE......

[ingenieur]

Originally Posted by Mrchntmarine

update, update - finally got a call form the dealer and now in addition to the cleaning of the intake manifold they are also going to walnut blast the engine but do not have to do and updating of the DDE......

Well, if they are not aware of the latest or revised Service Bulletins, then you are not getting the level of service expected of a dealer.

[Mrchntmarine]

Originally Posted by ingenieur

Well, if they are not aware of the latest or revised Service Bulletins, then you are not getting the level of service expected of a dealer.

He said they don't need to do any updating/reprogramming of the DDE because I've had all the campaigns due and am current with all applicable updates. Do they have to do an update/reprogram anytime after walnut cleaning? They said no programming necessary as they are not replacing any modules. Tks

[Mrchntmarine]

okay - got some pics back. Comments?? got the intake manifold. not sure about the 3rd pic and can someone tell if the where the blue arrow is pointing to is busted or whether its just not suppose to be a complete circle or if it even matters. Tks

[9mmkungfu]

Maybe it's because I'm on a mobile device, but I don't see any pictures.

[Mrchntmarine]

Originally Posted by 9mmkungfu

Maybe it's because I'm on a mobile device, but I don't see any pictures.

sorry, I posted but got an error and had to shrink them and try again.

[Hoooper]

It looks like the manifold has been cleaned? At least for the two closest ports, the rest I can't see. The blue arrow sure looks like that piece is broken but it is hard to tell. Not sure what significance that would have though. Doesn't look like they did anything on the rest of the engine though

[BB_cuda]

Don't think it's broken. I have a spare intake in the garage mailed from Bodacious. When I first got it and saw this, I thought the same thing. I hunted around on the net and found a photo of another and it had the same feature too. If you aren't sure of what I say, go hunt for yourself and you will find the same. I will post a photo tomorrow.

[Mrchntmarine]

okay, i did do some more hunting around and found a pic of another manifold and the piece looked the same. tks. but I still am not sure what I'm looking at in the 2nd and 3rd pics - the parts are suppose to have been cleaned but they still look dirty to me. Having never seen these clean or dirty, I'm not sure what they are suppose to look like and I can never get the service advisor on the phone easily and they do not respond to my emails very clearly or fully answer my questions. I was told that all the parts are suppose to have been cleaned before these pics were taken but I see soot in the 2nd and 3rd pics. Normal or not???

[Hoooper]

Those are not clean. You need to send them the sib in the this thread, (http://www.e90post.com/forums/showthread.php?t=983574) if they don't clean it per the sib it's most likely not done. All the ports in the head should be clean and look like a brand new casting