Quote:
Originally Posted by venturaII
So, not to hijack this thread, but it's sort of related... I recently read in GRM a recommendation from a well established Subaru tuning house that they suggest walnut media blasting to remove carbon buildup from the FA20 intake valves in WRXs every 30K miles (!). Since common symptoms of carbon buildup are lower power, poor idle quality, etc, I wonder how much truth there is to this, and how applicable this would be for us...?
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Less applicable to us, as we have port injection as well as direct. The main reason for the carbon build up is that the WRX is DI only, so there is no washing for the intake valves with fuel.