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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Carbon build-up after 46K
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      09-07-2021, 11:04 AM   #1
capt_slow
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Carbon build-up after 46K

I was interested to see how carbon build up would look like after 46K fully stock miles. So I decided to have a look at the throttle body with an endoscope. It was surprisingly easy to take off the pressure pipe from the throttle body. There is definite carbon build-up especially around the edges of the flap, but probably less than I expected as I can still make out the torx screws holding the flap to the hinge.






I suspect the gang here would be a better judge, how does my build-up look? I was thinking of getting the throttle body and intake manifold cleaned at 60K, but not so sure now. Interestingly, ISTA has a procedure for intake cleaning and its the proper submersion method. I would hope any dealer intake cleanings would use this vs. the spray.
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      09-08-2021, 09:02 AM   #2
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I'd say this is minor enough where a quick intake cleaning procedure with an intake cleaner like the Liqui Moly is enough.

I haven't heard much of dealers doing any actual intake cleaning on 328d at all, and most now are not serviced at the dealers anymore.
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      09-10-2021, 12:47 PM   #3
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@capt_slow I think I posted a while ago on these forums about my intake after 30K miles, it was roughly the same as yours. I will attach a photo to here as well.

I agree with Enabled about Liqui Moly. I have been doing preventative intake cleaning with LM Diesel Intake cleaner every 10,000 miles. It is not a perfect result, but cleans the valve and sooty mess around EGR input. It re-soots within 10,000 miles, but only on surface.

If you cannot find any LM diesel intake cleaners, let me know, I have a few extras. Purchased for the future.
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      09-26-2021, 12:07 PM   #4
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I have high mileage (115k) 318d (EU), and i recently cleaned MAP sensor. It was completely caked in and full of soot. I don't know how it even worked before i cleaned it. TBH i don't see any real world difference after cleaning, but placebo effect makes me happy little bit i guess
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