[W126 Coupe] Ignition vacuum advance question/problem

[Jonathan Hodgman]

Sounds like the weighs aren't moving...I'd take the dist. out and clean 
the pivots up.  Bosch actually makes a distributor lube but 1 tube will 
last about 10 lifetimes!

Jono
Josh Allen wrote:

> Ok all, I have a puzzle for someone.

>

> I was testing out a timing light that I'd just picked up, and using 

> the somewhat newly acquired MB repair manual for the timing specs, dug 

> in to see what my timing was.

>

> At idle, it was supposed to be 6-10* advanced, with the vacuum hose 

> unplugged, and it was near, and easily corrected to be that.

>

> The question comes from the 'vacuum connected' specifications, and my 

> car's apparent inability to reach the stated timing readings.

> Per the manual, at 1500 rpm, it should read 10-13* advanced, and at 

> 3500 rpm, it should be up to 24* advanced. When I revved the engine to 

> ~1500, it made around 8-10*, but further increase in rpm did nothing 

> to advance the timing.

>

> Would this be a sign of stuck centrifugal weights, somehow not getting 

> the correct vacuum signal, or something else entirely?

>

> Anyone have any suggestions to further troubleshoot what this might be 

> caused by?

>

> -Josh Allen

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>



-- 
Jonathan Hodgman
Blue Ridge Mercedes/AMG East
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