hey everyone. this problem has stumped me for a while and i can figure it out. maybe i should probably just take it to a mechanic instead but oh well..

anyways, i put the keys into the ignition and when i turn it to the first position, i can hear this clicking sound. Its very annoying and it used to go away before after i start the car up..but now it continues to keep clicking well after first position on the ignition. The sound is comming from the under part of the air filter housing, really close to the ignition coil that mounted on the side block of the engine. When the car is at go, i can still hear the clicking sound but it seems to go away when i apply breaks. anyone got any clues or had this problem before?

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1986 300E 200K + 2 years broken odometer
1978 300D 280K + 2 years broken odometer