Normally its less metallic.... but if the vacuumpump has a leak in one of the hoses there is a popping noise...
What you can check and do is this: remove the oil fillercap with running engine.... remove the rubber hose of the vacuumpump (a cilinder on the side of the camshaftscover )and cover the hole airtight with your finger and observe the possible disappearance of the noise (or Not/less) try to record it and post it again.
If it disappears... try to find the leak... enginemounts/brakebooster or if you have a manual gearbox the egr warmup valve (this can be blocked off if its leaking)
Last edited by 5cilinder; Sep 26th, 2021 at 15:41.
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