Walnut blasting - intake valve cleaning

What is walnut blasting?

Walnut blasting (cleaning with crushed walnut shells) is a modern and very effective method of mechanically cleaning the intake valves of direct-injection engines. We do it on petrol engines, mainly in Volkswagen Group cars (TSI, TFSI).

Finely crushed shells are blasted under pressure directly onto the intake valves, removing carbon deposits without damaging any metal parts of the engine.

Why is walnut blasting important?

In direct-injection engines, fuel does not wash over the intake valves, so carbon gradually builds up. These deposits can cause:

• rough running
• loss of power
• higher fuel consumption
• hesitation under acceleration
• poor cold starts and fluctuating idle
• engine damage in the long run

Walnut blasting effectively removes these problems and restores the engine's original characteristics.

How does the cleaning work?

1. Removing the intake manifold
2. Setting the valves to the closed position
3. Cleaning the intake valves with walnut shells
4. Thoroughly vacuuming out any remaining material
5. Ultrasonic cleaning of the injectors
6. Cleaning the intake mating surface
7. Reassembly with new gaskets and a final check

The whole process is gentle, safe and chemical-free.

Advantages of walnut blasting at GRUPPO MOTORS

🛠️ Professional, modern equipment

🥜 Optimal shell grit size

💨 Powerful extraction, no residue left in the engine

Indicative prices for intake valve cleaning on TSI/TFSI engines

The price is final and includes the intake and throttle body gaskets, an injector repair kit, the cleaning and all labour. We use ONLY GENUINE PARTS for this process.

We will be happy to quote a price for vehicles of other makes (Hyundai, Kia, Dodge, BMW, Mini, Jeep, ...) on request.