The 1999 210 has recently gotten louder @ idle. Neutral or drive makes no difference. Sounds like the engine/trans is under load, or higher idle. Idle speed is about 550 indicated.
Listening under the hood, no discernable/identifible noise to me, but with a stephscope I am getting a ticking sound near the front of the block.

I am wondering if the vac pump is the source. With 250K miles, is this an expected replacement intervial ?? I would perfer to replace, prior to the grenade. Is this a problem with this 606 engine.

Second problem with gearshift not returning to Park postion, still working on this, after removing console, shifter module and removing a small "ball-chain" key ring from within.

__________________
Gary
Experience is something you get, Just after you needed it....
'99 E300 295K, '83 300D 220K, '75 240D 185K sold
'80 MCI Bus Conv DD 6V92TA, w/4 cyl. Kubota diesel GenSet 12.5KW