In traditional fuel injection systems, fuel is sprayed into the intake manifold — cleaning the valves as it passes. In Gasoline Direct Injection (GDI) engines, fuel is injected directly into the combustion chamber, leaving the intake valves dry and vulnerable to carbon buildup.

Over time, this buildup restricts airflow and reduces performance. Common symptoms include:

• Rough idle or hesitation
• Loss of power or acceleration lag
• Poor fuel economy
• Misfire or check-engine light (often from intake valve deposits)
• “Cold-start stumble” or reduced turbo efficiency on TGDI engines

Without maintenance, this carbon buildup can severely impact fuel atomization and long-term engine reliability.

At The Garage MKG, we use a two-part strategy to clean and protect your GDI or TGDI engine:

1️⃣ Walnut Shell Blasting (Mechanical Cleaning)

We remove the intake manifold and use fine crushed walnut shells under controlled pressure to safely clean carbon deposits from the intake valves — restoring smooth airflow and combustion efficiency without damaging components.

2️⃣ BG Fuel System Service (Preventive Treatment)

We run a BG GDI chemical service through the fuel system to clean injectors, combustion chambers, and fuel rails while protecting high-pressure pumps from wear.

This process helps:

• Restore lost performance and throttle response
• Improve idle stability and fuel efficiency
• Extend the lifespan of injectors, pumps, and valves
• Prevent carbon buildup from returning prematurely

Direct injection engines benefit from proactive maintenance — not just reactive repairs. We recommend a BG GDI Service every 15,000–20,000 miles to keep the system clean, with walnut blasting every 60,000–80,000 miles (depending on driving style and engine type).

Our technicians evaluate your driving habits, fuel quality, and previous maintenance history to recommend the right service plan for your vehicle. Every procedure is documented in your Complete Vehicle Health Report with photos and technician notes, ensuring full transparency.

If your vehicle is running rough, losing power, or showing signs of carbon buildup, schedule GDI or TGDI service with The Garage MKG today. Call (231) 246-7735, visit 1860 Henry St, Muskegon, MI, or book online anytime.

We’ll assess your system, perform precision cleaning with walnut blasting and BG products, and protect your engine’s performance for miles to come.