Fuel System (Carburetor)
The Rochester E4MC carburetor is used only on the 5.0L (VIN Y) engines. Carburetor number is stamped vertically on float bowl, near secondary throttle. See Fig 1 . This number must be used for ordering replacement components and performing adjustments. Carburetor identification number must be transferred onto new float bowl if float bowl is replaced.
These carburetors are equipped with a computer control feedback system. This is indicated by the first letter "E" of identification number. The last letter of identification number indicates type of choke used. Letter "C" indicates a hot air type choke.