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      09-29-2013, 10:15 PM   #1
NikosBM
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Carbon Build up... affect turbos?

Hi everyone,

So I've been having some misfire issues with my 2009 335 (67,000km). After changing the plugs the car still ran rough. My mechanic then looked at it and said that the carbon build up in the intake valves was pretty bad because of bad fuel from the previous owner and that why's it is running rough. He showed me pics and they were similar to this:

http://desmond.imageshack.us/Himg52/...jpg&res=medium

So, now that I have discovered this, should I worry about my turbos because of the bad fuel and carbon build up in the intake valves?? I LOVE this car, however if it is going to cost $6000 to replace a turbo, then forget about it.

I am leaning towards trading it in for something that isn't direct injection...

What are you thoughts, should i be worried?
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      09-29-2013, 11:00 PM   #2
Dan_335
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Carbon build up on the valves is a common problem with this car, it is not a result of dirty fuel.

Typically people get them cleaned every 50,000 to 100,000kms.

I would suggest replacing your mechanic before your car. The intake build up isn't going to damage your turbos...
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      09-29-2013, 11:05 PM   #3
NikosBM
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Quote:
Originally Posted by Dan_335 View Post
Carbon build up on the valves is a common problem with this car, it is not a result of dirty fuel.

Typically people get them cleaned every 50,000 to 100,000kms.

I would suggest replacing your mechanic before your car. The intake build up isn't going to damage your turbos...
Well, he didn't really confirm or deny it. So i should NOT be worried about my turbos?
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      09-29-2013, 11:56 PM   #4
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Why not have your intake valves cleaned? Car will definitely run better.
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      09-30-2013, 12:50 AM   #5
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What are you worried about? Turbos have nothing to do with fuel delivery.
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      09-30-2013, 01:03 AM   #6
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The intake valves are at the wrong end of your turbo system to have a direct effect on damaging them, if it was something pre-turbo, ie intake side then sure carbon there, if it could exist would then have a chance of blowing through your turbo and damaging it.
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      09-30-2013, 01:52 AM   #7
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Carbon build up in the Intake is common for DI cars

Carbon build up in the Intake is common for DI cars.
All the BMW Turbo Direct Injection cars suffer from this.
Its not a problem with gas . You need to get the Intake
Valves cleaned or clean them yourself. Look up threads on
Walnut Blasting or the DIY's on Intake valve cleaning.
Needs to be done every 50 to 100k.
Turbo's wear out because they turn at super high speeds
and high temperatures.
If you buy a turbo car its likly you will have to replace them
at least once in the lifetime of the car if you keep it along time.
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      09-30-2013, 10:29 AM   #8
NikosBM
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Thank you folks... glad I don't have to worry about the turbos!

Last edited by NikosBM; 09-30-2013 at 10:36 AM.
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      10-01-2013, 12:56 PM   #9
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Has anyone performed the walnut blasting? Is it worth attempting or should I not bother with it and bring it to my mechanic?
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      10-03-2013, 10:29 PM   #10
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Quote:
Originally Posted by pk_ View Post
Has anyone performed the walnut blasting? Is it worth attempting or should I not bother with it and bring it to my mechanic?
Dealer did it to my car 2 days before CPO expires and it ran so much better. It's going to be a normal maintenance thing with direct injection.
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      10-04-2013, 08:07 AM   #11
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I've only heard of it sometimes happening with diesels .
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      10-08-2013, 11:26 AM   #12
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Got a 2007 E90 335i.
Had 100km or 60k miles on it.

Miss fire was there but no code.
Finally day before scheduled visit at dealer, I went into limp mode and had a code.... (I was happy)
Lol

Instead of guess like you are now, I knew where to start.

Code was for intake solenoid.
Well that was not my issue.

Here is what I did to fix my miss fire issue.

1) dealer did a walnut blast... No warranty here. Paid too much... But well worth it.
Think of a intake port cleaning as one of those regular services that must be done..... Regardless.
Be thank full it is every 40-60k miles.

But soon as I picked up the car, wow, what a performance difference.

2) I changed my Solenoids, both intake and exhaust.
My old ones are very clean.
That did not do anything.

Still miss firing....

Changed my plugs..... That did little.
Very little.

Then changed my coils week later.
No more miss fire.

The only miss fire I get now is at cold start initial start when rpm is dropping down to 600 from 1100.

Also, regarding damage to your turbos..... I read that your turbos get the most damage at cold starts.
I don't push my car much until temp is about 120 or higher.

In short the problem was intake ports, plug(s) and coil(s).

Ohhh also 2 cans of BG44k back to back on 2 tanks of gas.
Didn't notice any change.

Hope this helps.
DN
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