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    GM Firebird 1967-1981 Repair Guide

    VACUUM DIAGRAMS

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    See Figures 1 through 74



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    Fig. Fig. 1: Vacuum hose routing of the dual acting distributor system 1967-69 8-cylinder engines with 2-bbl. carburetors



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    Fig. Fig. 2: Vacuum hose routing of the dual acting distributor system 1967-69 8-cylinder engines with 4-bbl. carburetors



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    Fig. Fig. 3: Vacuum schematic for the dual acting distributor system 1967-69 models



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    Fig. Fig. 4: Vacuum schematic for the dual acting distributor system (continued) 1967-69 models



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    Fig. Fig. 5: Vacuum hose routing for the TCS system 1970 6-cylinder engines



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    Fig. Fig. 6: Vacuum hose routing for the TCS system 1970 8-cylinder engines



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    Fig. Fig. 7: Vacuum hose routing 1970 models



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    Fig. Fig. 8: Vacuum hose routing for the TCS system 1971-72 6-cylinder engines



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    Fig. Fig. 9: Vacuum hose routing 1971 8-cylinder engines (except 455 HO)



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    Fig. Fig. 10: Distributor vacuum hose schematic 1971 455 HO engines



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    Fig. Fig. 11: Vacuum hose routing for the TCS system 1972 8-cylinder engines



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    Fig. Fig. 12: Vacuum hose routing for the TCS system 1973 8-cylinder engines



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    Fig. Fig. 13: Vacuum hose schematic 1975 350 Federal engine with 2-bbl. carburetor and AIR system



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    Fig. Fig. 14: Vacuum hose schematic 1975 350 and 400 Federal engines with 4-bbl. carburetor and manual transmission



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    Fig. Fig. 15: Vacuum hose schematic 1975 350 and 400 Federal engines with 4-bbl. carburetor and automatic transmission



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    Fig. Fig. 16: Vacuum hose schematic 1975 350 and 400 California engines with 4-bbl. carburetor



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    Fig. Fig. 17: Vacuum hose schematic 1975 350 engine with 2-bbl. carburetor and without AIR system



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    Fig. Fig. 18: Vacuum hose schematic 1975 400 Federal engine with 2-bbl. carburetor



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    Fig. Fig. 19: Vacuum hose schematic 1975 455 Federal engine with 4-bbl. carburetor



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    Fig. Fig. 20: Vacuum hose schematic 1976 250 Federal engine with 1-bbl. carburetor



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    Fig. Fig. 21: Vacuum hose schematic 1976 250 California engine with 1-bbl. carburetor



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    Fig. Fig. 22: Vacuum hose schematic 1976 350 and 400 Federal engines with 2-bbl. carburetor



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    Fig. Fig. 23: Vacuum hose schematic 1976 350 and 400 California engines with 4-bbl. carburetor



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    Fig. Fig. 24: Vacuum hose schematic 1976 400 Federal engine with 4-bbl. carburetor and automatic transmission



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    Fig. Fig. 25: Vacuum hose schematic 1976 400 and 455 Federal engines with 4-bbl. carburetor and manual transmission



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    Fig. Fig. 26: Vacuum hose schematic 1976 455 Federal engine with automatic transmission



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    Fig. Fig. 27: Vacuum hose schematic 1976 455 California engine



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    Fig. Fig. 28: Vacuum hose schematic 1977 301 engine with manual transmission



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    Fig. Fig. 29: Vacuum hose schematic 1977 301 engine with automatic transmission and without AC



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    Fig. Fig. 30: Vacuum hose schematic 1977 301 engine with automatic transmission and AC



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    Fig. Fig. 31: Vacuum hose schematic 1977 350 (code P) and 400 engines with automatic transmission



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    Fig. Fig. 32: Vacuum hose schematic 1977 350 (code R) and 403 low altitude engines



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    Fig. Fig. 33: Vacuum hose schematic 1977 350 (code R) and 403 high altitude engines



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    Fig. Fig. 34: Vacuum hose schematic 1977 350 (code R) and 403 California engines



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    Fig. Fig. 35: Vacuum hose schematic 1977 400 engine with manual transmission



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    Fig. Fig. 36: Vacuum hose schematic 1978 231 low altitude engine



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    Fig. Fig. 37: Vacuum hose schematic 1978 231 high altitude engine



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    Fig. Fig. 38: Vacuum hose schematic 1978 231 California engine



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    Fig. Fig. 39: Vacuum hose schematic 1978 301 Federal engine with 2-bbl. carburetor and without AC



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    Fig. Fig. 40: Vacuum hose schematic 1978 301 Federal engine with 2-bbl. carburetor and AC



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    Fig. Fig. 41: Vacuum hose schematic 1978 301 Federal engine with 4-bbl. carburetor and without AC



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    Fig. Fig. 42: Vacuum hose schematic 1978 301 engine with 4-bbl. carburetor and AC



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    Fig. Fig. 43: Vacuum hose schematic 1978 305 low altitude engine with 2-bbl. carburetor



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    Fig. Fig. 44: Vacuum hose schematic 1978 305 California and high altitude engines with 2-bbl. carburetor



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    Fig. Fig. 45: Vacuum hose schematic 1978 350 engine with 4-bbl. carburetor



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    Fig. Fig. 46: Vacuum hose schematic 1978 400 engine with 4-bbl. carburetor and manual transmission



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    Fig. Fig. 47: Vacuum hose schematic 1978 400 engine with 4-bbl. carburetor, automatic transmission and single exhaust



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    Fig. Fig. 48: Vacuum hose schematic 1978 400 engine with 4-bbl. carburetor, automatic transmission and dual exhaust



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    Fig. Fig. 49: Vacuum hose schematic 1979 231 low altitude engine with manual transmission



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    Fig. Fig. 50: Vacuum hose schematic 1979 231 California engine with manual transmission



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    Fig. Fig. 51: Vacuum hose schematic 1979 231 California and high altitude engines with automatic transmission and without A.I.R. system



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    Fig. Fig. 52: Vacuum hose schematic 1979 231 California and high altitude engines with automatic transmission and A.I.R. system



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    Fig. Fig. 53: Vacuum hose schematic 1979 301 engine with manual transmission



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    Fig. Fig. 54: Vacuum hose schematic 1979 301 engine with 2-bbl. carburetor, automatic transmission and without AC



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    Fig. Fig. 55: Vacuum hose schematic 1979 301 engine with 2-bbl. carburetor, automatic transmission and AC



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    Fig. Fig. 56: Vacuum hose schematic 1979 301 engine with 4-bbl. carburetor, automatic transmission and without AC



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    Fig. Fig. 57: Vacuum hose schematic 1979 301 engine with 4-bbl. carburetor, automatic transmission and AC



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    Fig. Fig. 58: Vacuum hose schematic 1979 305 low altitude engine with 2-bbl. carburetor



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    Fig. Fig. 59: Vacuum hose schematic 1979 305 California engine with 2-bbl. carburetor



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    Fig. Fig. 60: Vacuum hose schematic 1979 305 California and high altitude engine with 4-bbl. carburetor



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    Fig. Fig. 61: Vacuum hose schematic 1979 350 low altitude engine with 4-bbl. carburetor



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    Fig. Fig. 62: Vacuum hose schematic 1979 350 California engine with 4-bbl. carburetor



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    Fig. Fig. 63: Vacuum hose schematic 1979 350 and 403 high altitude engines with 4-bbl. carburetor



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    Fig. Fig. 64: Vacuum hose schematic 1979 400 engine with 4-bbl. carburetor and manual transmission



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    Fig. Fig. 65: Vacuum hose schematic 1979 403 low altitude engine with 4-bbl. carburetor



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    Fig. Fig. 66: Vacuum hose schematic 1980 231 engine with manual transmission



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    Fig. Fig. 67: Vacuum hose schematic 1980 231 engine with automatic transmission



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    Fig. Fig. 68: Vacuum hose schematic 1980 265 engine with automatic transmission



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    Fig. Fig. 69: Vacuum hose schematic 1980 301 (code W) engine (except lock-up torque converter automatic transmission models)



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    Fig. Fig. 70: Vacuum hose schematic 1980 301 (code W) engine with lock-up torque converter automatic transmission



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    Fig. Fig. 71: Vacuum hose schematic 1980 301 (code T) engine



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    Fig. Fig. 72: Vacuum hose schematic 1980 305 engine



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    Fig. Fig. 73: Evaporative Emission Control System (EECS) schematic 1981 models with open canister

    Following are vacuum diagrams for most of the engine and emissions package combinations covered by the 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 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.

     
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