MK4 ALH - Engine On/Off flutter sound


Veteran Member
Mar 29, 2011
London Ont Canada
2003 Jetta Wagon TDI, 2015 Passat TDI, 2015 Touareg TDI
Hello all, my MK4 alh manual wagon has sat for a year with periodically being turned on/driven and recently I fixed a few issues (steering related) and started driving it daily.

One thing I noticed is that often when turning on the car in the mornings, I get this odd flutter sound.

Sometimes when I turn it off, I can hear it too but for not long.

Audio clip

When the car was parked over a year ago, I cleaned the intake/EGR and also resealed the vacuum pump with the Brm oil filter gasket.

Other than regular maintenance, I haven't replaced anything.

Does this sound like it could be vacuum related?

Anybody experience something like this before?

Turbo is a Mahle unit with about 80k on it.