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Motorcraft 4100 Carburetor Idle Mixture Screw - 16-28
Motorcraft 4100 Carburetor Idle Mixture Screw 16-28

Motorcraft 4100 Carburetor Idle Mixture Screw - 16-28

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Your Price: $6.95
Motorcraft 4100
Part Number: 16D28
Availability: In Stock

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Motorcraft 4100 carburetor idle mixture screws.  Includes new springs as pictured. Price is for 1 screw and you will need 2.

SPECS:
  • Thread = 10-32
  • Overall length = 1.6"
  • Shaft = .9415"

On the bench the screws are turned out 1 1/2 turns, then adjusted once the engine is warmed up.


Adjusting the Idle Mixture Screws

The idle mixture screws only affects idle. They simply control the amount of fuel and air mixture that is delivered at idle.

First run the screws in all the way until they seat, lightly. Too hard and you will damage the screw. Now back the screw out until the specified rpm is achieved. Turning the idle mixture screws clockwise (in) leans the idle mixture. Turning the idle mixture screws counter clockwise (out) richens the mixture.

Turn the mixture screws, alternating between the two in 1/4 turn at a time until the engine rpm starts to drop, then turn them back out 1/4 of a turn.


When adjusting your idle mixture screws doesn't seem to change the engine rpm much is an indication that there is something wrong and could be an indication of a needed rebuild.

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