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Old 06-12-2009, 04:57 PM
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Join Date: Jan 2003
Location: Dallas
Posts: 778
126 - Sticking lock knob

The passenger side lock knob on my '91 300SE is hard to pull upward. It pushes down just fine, and the key works fine in both directions. And the vacuum supply seems good; it just can't overcome the resistance when trying to move the knob upward.
As a result, the vacuum actuator has a hard time getting it all the way up, and the alarm sometimes goes off.
You can watch the knob when you hit the remote; it comes up an inch or so, then pauses, then pops another 1/8 inch. All the other locks work fine.

Is this probably the lock mechanism (big bucks!!!!)? Or could it be the vacuum mechanism dragging in the "unlock" direction?

Anyone have this happen; got an easy solution?
I tried spraying lube in the keyhole, and even down the lock knob shaft - silly me, I know I'm gonna have to take the panel off

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Old 06-12-2009, 05:49 PM
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Join Date: Apr 2003
Location: Brandon, Mississippi
Posts: 5,203
You will need to take the door panel off and clean up the linkage that goes to vacuum actuator. After xx years they get gummed up.

PS don't spray stuff in your lock cylinders - the locks do not have pins - they have plates with very slim tolerances.
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Old 06-12-2009, 07:17 PM
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Join Date: Jan 2003
Location: Dallas
Posts: 778
Thanks. Yeah, I guess I'm gonna have to go in there. Seems like just when I forget how I did it the last time, I have to take off another door panel.
Sure hope it's not the lock mechanism, I priced one of those and immediately got depressed.

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