Consumer Reports has no financial relationship with advertisers on this site. The process of walnut blasting, which entails cleaning the intake manifold and valves of a car’s engine with a high ...

The other day I dropped my car off at a European specialist shop, and while I was there, a technician was working in the engine bay of a Mk7 Golf R, cleaning out carbon deposits off the intake valves.

I have a 2012 VW Tiguan 2.0T with 80k. I just had maintenance done and just one month later the engine light came on. I went to the dealer and they told me my car needs a manual intake decarb, which ...