Could be several things, Lifter noise, Valve tapping, maybe even EGR valve tapping from what i read in a previous thread. Thats a tough issue to take to the dealer cause by the time you get there, the tapping will be gone and engine sound as smooth as ever when they check it out.
FYI, there is no EGR (Exhaust Gas Recirculating) valve on the Boxster. Very dated technology that. It was used to re-route exhaust gasses back through the engine until the Catalytic Converter(s) would heat up to operating temperature. The Boxster uses a Secondary Air Pump to add additional oxygen to the exhaust stream for more complete combustion and to heat up the cats...
Thanks for the help it's appreciated.
Hybrid Mode
