Hi Dave, I'm clutching at straws here and bow to your superior knowledge, it's weird and clearly not a common problem, when using the stethoscope there are no obvious noises from anywhere on the engine except from the fuel rail, everything else is fine, dead quiet when cold only kicks in when warm!
I will have a closer look at the lines as they go down toward the back of the car, you can only hear the noise when outside the car from the front left wheel arch and inside the car from the dash so something must be transmitting the pulses there.
All the best.
Myron
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