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 following diagrams for the same or similar configuration.
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.
See Figure 1
Fig. Fig. 1: The vacuum hose routing label can usually be found under the hood
See Figures 2 through 20
Fig. Fig. 2: Vacuum hose routing-1971 8R-C engines
Fig. Fig. 3: Vacuum hose routing-1972-73 18R-C engines
Fig. Fig. 4: Vacuum hose routing-1975 20R engines
Fig. Fig. 5: Vacuum hose routing-1976-80 20R engines (except California)
Fig. Fig. 6: Vacuum hose routing-1976-80 20R engines (California)
Fig. Fig. 7: Vacuum hose routing-1978-80 20R engines (Federal)
Fig. Fig. 8: Vacuum hose routing-1978-80 20R engines (California)
Fig. Fig. 9: Vacuum hose routing-1978-80 20R engines (Canada)
Fig. Fig. 10: Vacuum hose routing-1981-82 22R engines (except Canada)
Fig. Fig. 11: Vacuum hose routing-1981-82 22R engines (Canada M/T)
Fig. Fig. 12: Vacuum hose routing-1981-82 22R engines (Canada A/T)
Fig. Fig. 13: Vacuum hose routing-1983 22R engines
Fig. Fig. 14: Vacuum hose routing-1983 22RE-C engines
Fig. Fig. 15: Vacuum hose routing-1984-85 22RE-C engines
Fig. Fig. 16: Vacuum hose routing-1979 4M-E engines
Fig. Fig. 17: Vacuum hose routing-1979 4M-E engines
Fig. Fig. 18: Vacuum hose routing-1980 5M-E engines
Fig. Fig. 19: Vacuum hose routing-1981-82 5M-GE engines
Fig. Fig. 20: Vacuum hose routing-1983-85 5M-GE engines
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