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Old 08-08-2013, 01:54 AM
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Join Date: Aug 2013
Posts: 1
after fuel distributor swap, 79 450SEL barely runs

Hi all,

Replaced old frozen cast iron fuel distributor with a light alloy used unit from a donor car.

Problem is, can not get it to run with out a screw driver in place. I have tried to adjust the screw between the fuel distributor and plate, but nothing. Video attached.

Any help / suggestions is greatly appreciated!

79 450SEL - Running problem - YouTube

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Old 08-08-2013, 12:24 PM
cth350's Avatar
Registered User
Join Date: Dec 2000
Location: Long Island, NY
Posts: 3,840
If the distributor needed replacing, probably the WUR and perhaps the pipe between the WUR and the distributor.

Also, there's a an adjustment step for the air plate to perform to get the idle back to spec after the distributor is fiddled with.

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Old 08-14-2013, 09:33 AM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
You could also try richening up the base mixture, 3mm long-arm hex key in the hole in the tower right behind the sensor plate. Push down, turn it right 1/4 turn at a time and see if that helps the starting.

Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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