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    GM Chevy Mid-Size Cars 1964-1988 Repair Guide

    VACUUM DIAGRAMS

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    Below is a listing of 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 car's original equipment, refer to the diagrams below for the same or similar configuration.

    See Figures 1 through 101





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    Fig. Fig. 1: 1970 vapor control hoses-Chevelle and Monte Carlo

     


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    Fig. Fig. 2: 1970 Vapor control hoses

     


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    Fig. Fig. 3: 1971 6-cylinder engine vacuum hoses

     


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    Fig. Fig. 4: 1971 V8 engine vacuum hoses

     


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    Fig. Fig. 5: 1971 6-cylinder and V8 engine vapor control hoses-Chevelle

     


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    Fig. Fig. 6: 1971 6-cylinder and V8 engine vapor control hoses

     


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    Fig. Fig. 7: 1972 optional engine vapor control hoses- C-60 is 4 season A/C engine, LS-3 is turbo jet 402 V8 engine and L-48 is the turbo fire 350 V8 engine

     


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    Fig. Fig. 8: 1972 V8 engine vapor control hoses- C-60 is 4 season A/C engine, LS-3 is turbo jet 402 V8 engine and LS-5 is the turbo jet 454 V8 engine

     


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    Fig. Fig. 9: 1973 6-cylinder engine vapor control hoses

     


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    Fig. Fig. 10: 1976 6-cylinder EFE vacuum lines

     


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    Fig. Fig. 11: 1976 305 and 350 V8 engine-2bbl

     


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    Fig. Fig. 12: 1976 350 V8 engine-4bbl with EFE and AIR injection systems

     


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    Fig. Fig. 13: 1976 350 and 400 V8 engine-4bbl without EFE or AIR injection systems

     


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    Fig. Fig. 14: 1976 400 V8 engine-4bbl with EFE and AIR injection systems

     


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    Fig. Fig. 15: 1976 454 V8 engine-4bbl with AIR injection system

     


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    Fig. Fig. 16: 1977 305 V8 engine-2bbl altitude

     


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    Fig. Fig. 17: 1977 305 V8 engine-2bbl 49 states

     


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    Fig. Fig. 18: 1977 305 V8 engine-2bbl California

     


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    Fig. Fig. 19: 1977 350 V8 engine-4bbl 49 states

     


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    Fig. Fig. 20: 1977 350 V8 engine-4bbl altitude

     


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    Fig. Fig. 21: 1978 350 V8 engine-49 states

     


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    Fig. Fig. 22: 1978 305 V8 engine-California

     


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    Fig. Fig. 23: 1978 6-cylinder engine-49 states and altitude

     


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    Fig. Fig. 24: 1978 6-cylinder engine-California

     


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    Fig. Fig. 25: 1978 305 V8 engine-California alternate

     


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    Fig. Fig. 26: 1978 350 V8 engine-49 states alternate

     


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    Fig. Fig. 27: 1978 350 V8 engine-California and high altitude

     


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    Fig. Fig. 28: 1978 200 V6 engine-49 states

     


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    Fig. Fig. 29: 1978 6-cylinder engine-49 states and altitude alternate

     


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    Fig. Fig. 30: 1978 231 V6 engine-49 state and automatic transmission

     


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    Fig. Fig. 31: 1978 350 V8 engine-49 state alternate

     


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    Fig. Fig. 32: 1978 305 V8 engine-California alternate

     


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    Fig. Fig. 33: 1978 350 V8 engine-California alternate

     


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    Fig. Fig. 34: 1978 350 V8 engine-49 state alternate

     


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    Fig. Fig. 35: 1978 350 V8 engine-California alternate

     


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    Fig. Fig. 36: 1979 267 V8 engine-federal

     


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    Fig. Fig. 37: 1979 305 V8 engine-federal

     


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    Fig. Fig. 38: 1979 305 V8 engine-California

     


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    Fig. Fig. 39: 1979 305 V8 engine-federal

     


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    Fig. Fig. 40: 1979 305 V8 engine-high altitude

     


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    Fig. Fig. 41: 1979 305 V8 engine-California alternate

     


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    Fig. Fig. 42: 1979 350 V8 engine-federal

     


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    Fig. Fig. 43: 1979 350 V8 engine-California

     


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    Fig. Fig. 44: 1979 305 V8 engine-California alternate

     


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    Fig. Fig. 45: 1979 305 V8 engine-federal alternate

     


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    Fig. Fig. 46: 1979 350 V8 engine-California alternate

     


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    Fig. Fig. 47: 1979 350 V8 engine-high altitude

     


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    Fig. Fig. 48: 1980 3.8L V6 engine-automatic transmission

     


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    Fig. Fig. 49: 1980 4.4L V8 engine-automatic transmission

     


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    Fig. Fig. 50: 1980 5.0L V8 engine-automatic transmission

     


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    Fig. Fig. 51: 1980 5.0L V8 engine-California

     


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    Fig. Fig. 52: 1980 5.7L V8 engine-automatic transmission federal

     


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    Fig. Fig. 53: 1981 267 (4.4L) V8 engine-automatic transmission

     


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    Fig. Fig. 54: 1981 267 (4.4L) V8 engine-automatic transmission alternate

     


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    Fig. Fig. 55: 1981 229 (3.8L) V6 engine-automatic transmission

     


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    Fig. Fig. 56: 1981 229 (3.8L) V6 engine-automatic transmission alternate

     


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    Fig. Fig. 57: 1981 231 (3.8L) V6 turbo engine-automatic transmission

     


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    Fig. Fig. 58: 1981 305 (5.0L) V8 engine-automatic transmission

     


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    Fig. Fig. 59: 1982 231 (3.8L) V6 engine

     


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    Fig. Fig. 60: 1982 267 (4.4L) V8 engine

     


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    Fig. Fig. 61: 1983 229 (3.8L) V6 engine-2bbl with automatic transmission

     


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    Fig. Fig. 62: 1983 229 (3.8L) V6 engine-alternate federal and high altitude 2bbl with automatic transmission

     


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    Fig. Fig. 63: 1983 231 (3.8L) V6 engine-California 2bbl with automatic transmission

     


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    Fig. Fig. 64: 1983 231 (3.8L) V6 engine-federal 2bbl with automatic transmission

     


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    Fig. Fig. 65: 1983 263 (4.3L) V6 diesel engine-federal and high altitude with automatic transmission

     


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    Fig. Fig. 66: 1983 305 (5.0L) V8 engine-California with automatic transmission

     


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    Fig. Fig. 67: 1983 305 (5.0L) V8 engine-except California

     


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    Fig. Fig. 68: 1983 305 (5.0L) V8 engine-automatic transmission

     


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    Fig. Fig. 69: 1984 231 (3.8L) V6 engine-federal 2bbl with automatic transmission alternate

     


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    Fig. Fig. 70: 1984 231 (3.8L) V6 engine-California 2bbl with automatic transmission

     


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    Fig. Fig. 71: 1984 231 (3.8L) V6 engine-Canada 2bbl with automatic transmission

     


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    Fig. Fig. 72: 1984 231 (3.8L) V6 engine-export 2bbl with automatic transmission

     


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    Fig. Fig. 73: 1984 305 (5.0L) V8 engine-California 4bbl with automatic transmission

     


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    Fig. Fig. 74: 1984 305 (5.0L) V8 engine-Canada 4bbl with automatic transmission

     


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    Fig. Fig. 75: 1984 305 (5.0L) V8 engine-export 4bbl with automatic transmission

     


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    Fig. Fig. 76: 1984 305 (5.0L) V8 engine-federal 4bbl with automatic transmission alternate

     


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    Fig. Fig. 77: 1984 305 (5.0L) V8 engine-federal 4bbl with automatic transmission alternate

     


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    Fig. Fig. 78: 1984 305 (5.0L) V8 engine-California 4bbl with manual or automatic transmission

     


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    Fig. Fig. 79: 1984 350 (5.7L) V8 diesel engine-federal low altitude with automatic transmission

     


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    Fig. Fig. 80: 1984 350 (5.7L) V8 diesel engine-federal high altitude with automatic transmission

     


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    Fig. Fig. 81: 1985 262 (4.3L) V6 engine-federal EFI

     


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    Fig. Fig. 82: 1985 262 (4.3L) V6 engine-California EFI

     


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    Fig. Fig. 83: 1985 305 (5.0L) V8 engine-federal

     


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    Fig. Fig. 84: 1985 305 (5.0L) V8 engine-California

     


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    Fig. Fig. 85: 1985 305 (5.0L) V8 engine-Canada

     


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    Fig. Fig. 86: 1985 305 (5.0L) V8 engine-export

     


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    Fig. Fig. 87: 1985 305 (5.0L) V8 engine-federal alternate

     


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    Fig. Fig. 88: 1985 305 (5.0L) V8 engine-California alternate

     


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    Fig. Fig. 89: 1986 262 (4.3L) V6 engine-federal EFI with automatic transmission

     


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    Fig. Fig. 90: 1986 262 (4.3L) V6 engine-federal EFI with automatic transmission alternate

     


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    Fig. Fig. 91: 1986 262 (4.3L) V6 engine-California EFI with automatic transmission

     


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    Fig. Fig. 92: 1986 262 (4.3L) V6 engine-California EFI with automatic transmission alternate

     


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    Fig. Fig. 93: 1986 305 (5.0L) V8 engine-federal with automatic transmission

     


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    Fig. Fig. 94: 1986 305 (5.0L) V8 engine-federal with automatic transmission alternate

     


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    Fig. Fig. 95: 1986 305 (5.0L) V8 engine-federal with automatic transmission alternate

     


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    Fig. Fig. 96: 1986 305 (5.0L) V8 engine-California with automatic transmission

     


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    Fig. Fig. 97: 1986 305 (5.0L) V8 engine-California with automatic transmission alternate

     


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    Fig. Fig. 98: 1986 305 (5.0L) V8 engine-Canada with automatic transmission

     


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    Fig. Fig. 99: 1986 305 (5.0L) V8 engine-Canada with automatic transmission alternate

     


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    Fig. Fig. 100: 1986 305 (5.0L) V8 engine-federal with automatic transmission alternate

     


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    Fig. Fig. 101: 1986 305 (5.0L) V8 engine-California with automatic transmission alternate

     

     
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