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Old 02-06-2002, 05:43 PM
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Join Date: Nov 2001
Posts: 53
Question adjusting rest stop of air flow plate

I read in the archives about Benzmac's repair reccomendation of adjusting the rest stop on the air flow plate, and I am wanting to see if my car responds to it. Currently my 1990 300E will always take two attempts to start unless it is warm. Benzmac warned that only a certified mechanic should make this adjustment. and if one screws up the adjustment the whole distributor has to come off to go the other way. My problem is this, I have yet to find a good indy here (50 miles north of Grand Rapids,MI) and I asked my local MB dealer if they would do it for me and the service assistant told me I would have at least 1/2 hour of diagnostic time, and the techs would then consider how to move forward.

I would appreciate any feedback you all might have as to wether or not I should attempt this myself, and insight into it if you have done it yourself.



1990 300E (118K)
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Old 02-06-2002, 06:22 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
The whole thing takes less than 1/2 hour, but, if you mess up, you will damage the engine. The reason is fuel will leak into the cylinder in liquid form. Because liquids are not able to be compressed, when you turn the starter, you may bend a rod.

The could only happen if adjusted incorrectly, but I have seen a pro do this the wrong way!
Donnie Drummonds
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Old 02-06-2002, 06:36 PM
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Join Date: Nov 2001
Posts: 53
Thanks for the reply,

What can one do to escape making such a mistake? And how exactly do you measure the 2mm deflection? Thanks again for all the good advice


1990 300E (118K)
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