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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-26-2013, 07:10 AM
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galahad05 galahad05 is online now
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Walnut shell blasting before and after

Just wanted to show you guys a couple of pictures.









I've had some problems with drivability and the dealership replaced all plugs, coil #2 (cylinder #2 misfire codes + half-engine symbol) and eventually a BMW Corporate good-will replacement of all 6 injectors. Made the problem much better, but didn't go away completely.

Car was in the shop for other reasons, so I had them do a walnut shell blasting.

I should get the car back tomorrow or Thursday, so we'll see how it drives differently.


In any case, I think I'll simply have this done every 3 years (~36k miles) as preventative maintenance.
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  #2  
Old 02-26-2013, 07:14 AM
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furby076 furby076 is online now
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So they blast the inside of the car with walnut shells? Wow, in all my years never heard of that. But it would be a great way to clear out hard to get sludge/debrii.
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  #3  
Old 02-26-2013, 07:51 AM
SuperTerp SuperTerp is offline
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It'll help, trust me. I'd get some weird rumblings/grumblings and now perfect.

Yours do look bad.
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  #4  
Old 02-26-2013, 08:00 AM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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My car just hit 32k miles. I guess I'll be doing it some time this year.

The SES light came on in my car a a few weeks ago with a cylinder #1 misfire code, and after several days at the dealership, they determined it was a bad injector, and a bad coil, so they replaced 3 injectors, 3 coils and 3 spark plugs (everything on bank 1). So far, after about a thousand miles, everything is OK.
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  #5  
Old 02-26-2013, 08:09 AM
jbyron jbyron is offline
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How much does the dealer charge for that service?
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  #6  
Old 02-26-2013, 08:40 AM
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galahad05 galahad05 is online now
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Mine was about $750.
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  #7  
Old 02-26-2013, 08:41 AM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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How much does the dealer charge for that service?
$700 - $800, but a reputable indie shop that has the equipment will *probably* do it for less.
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  #8  
Old 02-26-2013, 08:47 AM
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Walnut shells were used to clean th inside of a jet engine years ago.
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  #9  
Old 02-26-2013, 10:31 AM
BashedBarrique BashedBarrique is offline
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Apparently there is a design flaw with these engines. It is not acceptable that the intake ports should accumulate deposits to that degree in the amount of time listed. I have only been reading the posts here for the last month or so but I have seen this issue come up too many times.

Is this restricted to the 335i model? I have only seen it mentioned by 335i owners.

This would be especially strange since the 335i has direct injection and the only thing that should be flowing through those ports is air.

It could be a crankcase ventilation issue. Oil vapor from the crankcase is recirculated through the intake system in most engines for emissions purposes (PCV Positive Crankcase Ventilation). Perhaps this vapor is condensing in the ports to form this crud.

Also since the 335i is a turbocharged engine it is possible that the elevated pressures and temperatures of the air charge are causing the oil vapor to form these deposits.

I recently rebuilt a 4.2 liter V6 from a 2002 F-150 with 108,000 tough miles. The engine had been badly neglected by the previous owner to the point that the engine spun a rod bearing.

While the lack of oil changes had caused severe oil sludging of the areas of the engine that see oil, the intake manifold and intake ports were MUCH cleaner than the intake ports of these BMW 335i engines with one third the mileage.

Something is very wrong with that picture!
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  #10  
Old 02-26-2013, 11:18 AM
SuperTerp SuperTerp is offline
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Quote:
Originally Posted by BashedBarrique View Post
Apparently there is a design flaw with these engines. It is not acceptable that the intake ports should accumulate deposits to that degree in the amount of time listed. I have only been reading the posts here for the last month or so but I have seen this issue come up too many times.

Is this restricted to the 335i model? I have only seen it mentioned by 335i owners.

This would be especially strange since the 335i has direct injection and the only thing that should be flowing through those ports is air.

It could be a crankcase ventilation issue. Oil vapor from the crankcase is recirculated through the intake system in most engines for emissions purposes (PCV Positive Crankcase Ventilation). Perhaps this vapor is condensing in the ports to form this crud.

Also since the 335i is a turbocharged engine it is possible that the elevated pressures and temperatures of the air charge are causing the oil vapor to form these deposits.

I recently rebuilt a 4.2 liter V6 from a 2002 F-150 with 108,000 tough miles. The engine had been badly neglected by the previous owner to the point that the engine spun a rod bearing.

While the lack of oil changes had caused severe oil sludging of the areas of the engine that see oil, the intake manifold and intake ports were MUCH cleaner than the intake ports of these BMW 335i engines with one third the mileage.

Something is very wrong with that picture!
This is not a BMW issue this is a direct injection issue. You can see gross intakes on lexus forums, mazda, exc.
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  #11  
Old 02-26-2013, 11:23 AM
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thekurgan thekurgan is online now
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Originally Posted by galahad05 View Post


In any case, I think I'll simply have this done every 3 years (~36k miles) as preventative maintenance.
Smart.
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  #12  
Old 02-26-2013, 11:32 AM
BashedBarrique BashedBarrique is offline
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Quote:
Originally Posted by SuperTerp View Post
This is not a BMW issue this is a direct injection issue. You can see gross intakes on lexus forums, mazda, exc.
I wonder what it is about DI that is causing this issue? Maybe since port injected engines have fuel flowing through the ports it keeps the intake ports cleaner?
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  #13  
Old 02-26-2013, 11:36 AM
BashedBarrique BashedBarrique is offline
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Maybe they could develop a crankcase ventilation system that didn't send oil vapor through the intake ports. Perhaps some sort of filtration system to clean it first.

In the old days (pre-emission era) these oil vapors were just vented to the atmosphere.
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  #14  
Old 02-26-2013, 11:46 AM
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Good write up here:

http://www.edmunds.com/autoobserver-...-adopters.html
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  #15  
Old 02-26-2013, 11:52 AM
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Originally Posted by BashedBarrique View Post
I wonder what it is about DI that is causing this issue? Maybe since port injected engines have fuel flowing through the ports it keeps the intake ports cleaner?
Bingo... and over the valves.
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  #16  
Old 02-26-2013, 12:56 PM
BashedBarrique BashedBarrique is offline
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Originally Posted by laser View Post
Great article Laser.

It sounds like the newer DI engines have solved the issue with designs that optimize injection timing events and different combustion chambers designed to prevent carbon build up.

Bummer for the folks that have the older DI engines though. I wonder if some retro-fit can be implemented to solve the problem?
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  #17  
Old 02-26-2013, 01:24 PM
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galahad05 galahad05 is online now
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I've heard about people using a new class of higher-flashpoint motor oils to minimize (eliminate?) this problem. This would be a good start on these older-style motors.
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  #18  
Old 02-26-2013, 02:04 PM
unrealii unrealii is offline
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Originally Posted by BashedBarrique View Post
Bummer for the folks that have the older DI engines though. I wonder if some retro-fit can be implemented to solve the problem?
The best I have seen is adding an oil catch can. That will reduce the carbon, but not eliminate it.
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  #19  
Old 02-26-2013, 03:00 PM
BMWTurboDzl BMWTurboDzl is online now
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Quote:
Originally Posted by galahad05 View Post
I've heard about people using a new class of higher-flashpoint motor oils to minimize (eliminate?) this problem. This would be a good start on these older-style motors.
Lubrizol released a presentation on LowSAPs oils a few years ago and one of the benefits was lower intake deposits. Lubrizol is an additive company.

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  #20  
Old 02-26-2013, 05:47 PM
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Kilgore Trout Kilgore Trout is offline
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What do they do with the actual walnuts afterwards? I like walnuts.
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  #21  
Old 02-26-2013, 07:35 PM
SuperTerp SuperTerp is offline
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What do they do with the actual walnuts afterwards? I like walnuts.
My Indy says they can get two uses out of the shells so he sucks them up with a vac and uses them one more time. The nuts get a burial ceremony.

Last edited by SuperTerp; 02-26-2013 at 07:36 PM.
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  #22  
Old 02-26-2013, 07:36 PM
BashedBarrique BashedBarrique is offline
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Originally Posted by Kilgore Trout View Post
What do they do with the actual walnuts afterwards? I like walnuts.
Hehe, I'm pretty sure that the shells come pre-crushed without the walnuts. But if you find out that some of these repair places are husking walnuts themselves and discarding the walnuts...

...let me know.

I like walnuts too.
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  #23  
Old 02-26-2013, 07:56 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by galahad05 View Post
I've heard about people using a new class of higher-flashpoint motor oils to minimize (eliminate?) this problem. This would be a good start on these older-style motors.

Thanks for reminding me Galahad - have a customer, major mfg of engine oil. Gotta ask 'em about this.

Can't hardly believe all the questions here....ya'll would benefit from a bit o'hunt 'n' peck....massive info available on this issue, just for 335i.

HERE is a walnut shell DIY, an old favorite. Have the equip myself, just itchin' to take mine apart!
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Old 02-26-2013, 07:58 PM
SuperTerp SuperTerp is offline
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HERE is a walnut shell DIY, an old favorite. Have the equip myself, just itchin' to take mine apart!
My hands are too silky smooth for manual labor
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  #25  
Old 02-26-2013, 08:02 PM
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Quote:
Originally Posted by unrealii View Post
The best I have seen is adding an oil catch can. That will reduce the carbon, but not eliminate it.

An impingement filter, should remove nearly all of the liquid phase.

But! There is a gas phase the may be coking on hot valves. Call me nuts, or call me crazy, but shouldn't that be condensable?

How boutcha Texas chemists?
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