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Thanks for confirming the humming noise is normal.
Driving is mostly motorway, not afraid to rag it to 5-6k rpm either (it's an auto)
So to be clear, the "pitch" of the injectors is the noise we are all referring to?
From some positions around car it sounds like it could be combustion leak like a loose injector but there are no signs of this around injectors etc.
They are all consistent so can't be anything serious? Just annoying. ..
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