Following are vacuum diagrams for most of the engine and emissions package combinations covered by this guide. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar conguration.
See Figure 1 through 11
Fig. Fig. 1: View of a common vacuum hose routing label-4A-F engine shown
If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.
Fig. Fig. 2: Emission control system-1988-89 4A-F Federal and Canada
Fig. Fig. 3: Emission control system-1988-89 4A-F California
Fig. Fig. 4: Emission control system-1988-89 4A-GE
Fig. Fig. 5: Emission control system-1990-92 4A-FE 2WD California and 4WD
Fig. Fig. 6: Emission control system-1990-92 4A-FE 2WD Federal and Canada
Fig. Fig. 7: Emission control system-1990-91 4A-GE
Fig. Fig. 8: Emission control system-1993-95 4A-FE Federal and Canada
Fig. Fig. 9: Emission control system-1993-95 4A-FE California
Fig. Fig. 10: Emission control system-1993-95 7A-FE
Fig. Fig. 11: Emission control system-1996-97 4A-FE and 7A-FE