Porpoise Hork
Well-Known Member
This sound is fairly common with GDI engines. It's a combination of the cam driven high pressure fuel pump (HPFP) and injectors actuating at idle. The injector solenoids are going to be a tad noisy given they have to handle upwards of 2,000 psi of fuel in some instances.. My 08 GTI made this exact same sound and made you think it was a diesel when idling. Some will be much louder, while others such as my wife's Hyundai Santa Fe 2.0T are virtually silent. My Ranger is fairly quiet and you can only hear it with the hood up.
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