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Carbon Cleaning / Walnut Blasting cost
Carbon Cleaning / Walnut Blasting on a BMW with the N54/N55/N20 engine typically costs $180–$1,300 at an independent shop, $600 at a BMW dealer, or $30–$75 in parts DIY, based on 11 real owner-reported prices.
Last updated · Sources: 11 owner-reported prices from 2 cited threads
Removing intake valve carbon on direct-injection engines. Real prices reported by owners on Reddit and BMW forums, with a link to every one.
Limited data: Two threads now, including one N55 price. Most prices are still N54.
Typical cost
Ranges are the lowest and highest prices in the table below. They are not estimates. Shop prices include parts and labor unless noted.
Every price we found
| Price | Where | Details | Source |
|---|---|---|---|
| $600 | Dealer | Local BMW dealer price (Virginia, 2021) | [1] |
| $1,050 | Indy | Reputable BMW shop quote, Virginia | [1] |
| $1,300 | Indy | Another BMW shop quote, Virginia | [1] |
| $350 | Indy | Paid at an indy (2020) | [1] |
| $425 | Indy | Shop quote, Las Vegas; other shops $700+ | [1] |
| $450 | Indy | "About $450" in an expensive area | [1] |
| $400 | Indy | Shop quote, Vienna VA area | [1] |
| $180 | Indy | Local guy working out of his garage | [1] |
| $75 | DIY | Harbor Freight blaster kit and walnut media, "under $75" | [1] |
| $475 | Indy | Shop quote, 2014 F30 335i (N55), Raleigh NC (2019) | [2] |
| $30 | DIY | Harbor Freight portable blaster ($30), if you already have a compressor | [2] |
- N55 owners report much less carbon than N54 at the same mileage, so many skip it on N55 (source 2).
- Commenters say $300–$450 is a fair indy price; quotes above $1,000 suggest the shop does not want the job.
How long it takes
DIY: "a fairly decent weekend job" if you can pull the intake manifold (source 2).
Which cars are affected
Direct-injection BMWs: 135i/335i/535i (N54/N55), 328i (N20).
Symptoms
- Rough idle, cold-start misfires
- Loss of power or hesitation
- Misfire codes with good plugs and coils
Parts list
| Walnut blasting kit / intake port adapter | ECS TuningPelican PartsAmazon |
| Walnut shell media 18-40 grit | ECS TuningPelican PartsAmazon |
| Intake manifold gaskets | ECS TuningPelican PartsAmazon |
Check fitment for your exact car (VIN) before ordering. Links may become affiliate links in the future.
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Common questions
How much does Carbon Cleaning / Walnut Blasting cost?
Carbon Cleaning / Walnut Blasting on a BMW with the N54/N55/N20 engine typically costs $180–$1,300 at an independent shop, $600 at a BMW dealer, or $30–$75 in parts DIY, based on 11 real owner-reported prices.
How much does Carbon Cleaning / Walnut Blasting cost at a BMW dealer?
Real dealer prices we found ranged $600 (1 data point, median $600).
How much does an independent shop charge for Carbon Cleaning / Walnut Blasting?
Independent shop prices ranged $180 to $1,300 (8 data points, median $438).
Can I do Carbon Cleaning / Walnut Blasting myself?
Owners who did it themselves reported $30 to $75 in parts and tools.
How long does Carbon Cleaning / Walnut Blasting take?
DIY: "a fairly decent weekend job" if you can pull the intake manifold (source 2).
Which BMWs are affected?
Direct-injection BMWs: 135i/335i/535i (N54/N55), 328i (N20).
Related repairs
Sources
- Fair price for a shop to walnut blast a N54 (E90post)
- n55 f30 walnut blast 2019 (F30 Bimmerpost)
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