Fuel Distribution Plate on Startup - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 03-01-2014, 05:47 PM Thread Starter
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Fuel Distribution Plate on Startup

Should this open at start-up? I noticed if it is cracked open manually the car starts but not otherwise.

Might this give me a clue to my intermittent no start problem on the 77 280SE?

Thanks so much.
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post #2 of 4 (permalink) Old 03-02-2014, 09:59 AM
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Negative, the throttle should stay closed at startup (provided you're not pumping the gas pedal). Air supply for start up and idle is the responsibility of this widget here called the auxiliary air valve (aka idle control valve)

W107 SL SLC W116 Mercedes Benz Auxiliary Air Slide Idle Valve 0280140032 | eBay

That one's for a V8, but yours looks similar.

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post #3 of 4 (permalink) Old 03-02-2014, 06:08 PM
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it should go down slightly as you crank , if it does not move , you wont get any fuel . it also depend of the setting of the basic fuel mix at the 3 mm allen screw . see if you crank while stepping on gas pedal it does make the air sensor plate to go down [ slightly ].
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post #4 of 4 (permalink) Old 03-02-2014, 06:19 PM
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remember the air flow will cause this plate to move down , if you have vacuum leaks in the intake system , this will reduce the air flow , and the plate will not move .you can test for this by turning ignition on , and push very slightly on the plate , you will hear the injectors coming on .dont over do it or you flood the engine .you could try adjusting the 3 mm screw clockwise a very small amount to see if this help .you have to push the screw down [ spring loaded ]to connect .,this will rich en the mix . this is very sensitive , i dont like people to play with this , but ???
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