Standard procedure for engines with direct injection that are prone to carbon buildup on the intake
valves, is walnut blasting. The process does require a "plug" to seal the inlet port while blasting and
this might be a problem with a port injected engine like the 4AGE that normally would not require
blasting. You could enguire at your local Euro car specialist to see if they can help. They should have
a walnut (ground walnut shells) blasting setup in house.
Cheers... jondee86
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