No, it’s not an April Fools’ Day joke. Walnut shell blasting is a procedure for cleaning vales of the direct injection engines.
Older GDI engines (direct injection engines) were designed to improve fuel economy and power through direct injection – they injected fuel directly into the combustion chamber. Unfortunately, over time this design can cause carbon buildup on the valves. Carbon buildup in turn, can cause poor drivability, hesitation, and can cause the check engine light to be illuminated by the onboard computer. Walnut shell blasting is the solution.
Special equipment uses finely ground walnut shells to “blast” (using air pressure) the dirty valves. Walnut shells are a good abrasive ( and biodegradable too) and they remove carbon particles leaving clean valves for your driving enjoyment. So if you drive a vehicle equipped with a GDI engine – be it a BMW, Volkswagen, Audi, Kia or Mazda, we recommend having it inspected for carbon buildup on the valves. For more information click the link to our Walnut Shell Blasting web page.