Carburetor - ROCHESTER M4MEF 4BBL: Description

The M4MEF carburetor is a 4-barrel, two-stage carburetor. There are 3 major sub-assemblies consisting of an air horn, float bowl, and throttle body. The secondary stage is composed of 2 large bores using the air valve principle (fuel is metered in direct proportion to amount of air passing through secondary bores). Vehicles equipped with manual transmission use an Idle Stop Solenoid (ISS). The ISS provides necessary idle speed and prevents dieseling.

A breakdown of model designation for the Rochester carburetor model M4MEF is as follows:

• M) Modified open-loop primary metering system.
• 4M) Quadrajet 4-barrel, two stage carburetor.
• E) Integral electric choke.
• F) Adjustable wide open throttle mixture control.