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Carbon buildup in direct injection engines commonly triggers misfire and performance fault codes. We scan for stored codes before the service to baseline your engine health, then confirm the carbon cleaning has resolved them after the job is done.

We carefully remove the intake manifold to expose the intake valves and ports where carbon deposits accumulate. Our mechanics inspect all engine parts during disassembly and flag any additional issues before we proceed with the walnut blasting process.

Finely ground walnut shells are blasted into each intake port under controlled pressure while the piston sits at top dead centre. Walnut shell media removes hardened carbon deposits from the intake valves without damaging the combustion chambers or the engine’s internal components.

Walnut shell media and dislodged carbon are vacuumed out simultaneously throughout the process. This prevents debris from entering the combustion chambers and protects the critical engine components below the intake valves during the carbon cleaning.

After removing carbon deposits from each port, we inspect the intake valves and surrounding engine parts. Any remaining carbon buildup is extracted before reassembly to ensure a clean engine and fully restored airflow through the intake system.

A failed PCV system accelerates carbon buildup in direct injection engines by allowing excess oil vapour into the intake system. We inspect the PCV valve during every walnut blasting service and advise on any faults before starting additional work.

We reinstall the intake manifold using genuine OEM gaskets. Reusing old gaskets risks vacuum leaks that affect the engine’s performance, fuel economy, and efficiency. We never take that shortcut.

Every vehicle is road tested after the carbon cleaning service. We confirm improved acceleration, smoother idle, and restored engine performance before returning your car. Improved performance and restoring power are verified on every job.

A final scan confirms no fault codes remain, and engine health is restored. You receive a written service record for your files and for any manufacturer or fleet warranty requirements.