When I unlock the doors using the remote on my 2002 CLK430 the trunk takes about 20 - 30 seconds longer then the doors and then finally unlocks. I disasembled the lock itself and its greased well with white grease and moves freely, is this a vacuum problem or maybe a cracked vacuum cable? The car has almost 45K on it and its in very new condition.

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1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)

Did you check the vacumm line for leaks?

I have traced the problem to where I believe it is the device that locks the fuel door. It seems like it may need lubricated. If I lock/unlock 3 or 4 times the trunk and fuel door start to work ok. If it sits again for 30 minutes in the garage (about 40 degrees) it is then slow to release again.

Does it sound like a vacuum or lubricate issue?

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1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)

Could that small black plastic piston on the back of the trunk lock have a cracked housing ?