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    GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

    VACUUM DIAGRAMS

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    See Figures 1 through 45





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    Fig. Fig. 1: 1975-76 Pontiac 350 2bbl

     


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    Fig. Fig. 2: 1975-77 Buick 350 4bbl with A/C

     


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    Fig. Fig. 3: 1975-76 Pontiac 350, 400 4bbl

     


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    Fig. Fig. 4: 1975 Olds 400 4bbl (49 states)

     


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    Fig. Fig. 5: 1975-76 Olds 350, 455 4bbl (49 states)

     


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    Fig. Fig. 6: 1975-76 Pontiac 455 (49 states)

     


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    Fig. Fig. 7: 1975-77 Buick 455

     


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    Fig. Fig. 8: 1977 Pontiac 301 with A/C

     


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    Fig. Fig. 9: 1977 Pontiac 350, 400

     


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    Fig. Fig. 10: 1977 Olds 350, 403 (49 states)

     


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    Fig. Fig. 11: 1978 Olds 231 (49 states)

     


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    Fig. Fig. 12: 1978 Buick 231 Turbo 2bbl

     


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    Fig. Fig. 13: 1978 Buick 231 2bbl

     


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    Fig. Fig. 14: 1978 Buick 231 2bbl (49 states)

     


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    Fig. Fig. 15: 1978 Buick Turbo 4bbl

     


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    Fig. Fig. 16: 1978 Olds 260

     


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    Fig. Fig. 17: 1978 Pontiac 301

     


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    Fig. Fig. 18: 1978 Pontiac 301 4bbl

     


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    Fig. Fig. 19: 1978 Pontiac 400 with A/C

     


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    Fig. Fig. 20: 1979 Pontiac 231 V6

     


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    Fig. Fig. 21: 1979 Buick 231 2bbl

     


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    Fig. Fig. 22: 1979 Pontiac 301 2bbl

     


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    Fig. Fig. 23: 1979 Buick 307 2bbl

     


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    Fig. Fig. 24: 1979 Olds 307

     


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    Fig. Fig. 25: 1979-80 Pontiac 231 with C-4

     


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    Fig. Fig. 26: 1979-80 Buick C-4

     


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    Fig. Fig. 27: 1979 Olds 301

     


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    Fig. Fig. 28: 1979 Buick 350 4bbl

     


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    Fig. Fig. 29: 1979 Pontiac 350, 403 4bbl

     


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    Fig. Fig. 30: 1979-80 Pontiac 350 4bbl

     


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    Fig. Fig. 31: 1979 Olds 350, 403

     


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    Fig. Fig. 32: 1979 Buick 403 4bbl

     


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    Fig. Fig. 33: 1980-84 231

     


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    Fig. Fig. 34: 1980 Pontiac 301

     


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    Fig. Fig. 35: 1980-84 Olds 307 low altitude

     


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    Fig. Fig. 36: 1980-81 Olds 350 4bbl

     


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    Fig. Fig. 37: 1980 350 Diesel

     


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    Fig. Fig. 38: Diesel EGR system up to 1983

     


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    Fig. Fig. 39: California diesel EGR up to 1983

     


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    Fig. Fig. 40: Low altitude diesel EGR 1984 and up (high altitude similar BUT, VRV reduces vacuum when altitude solenoid is DE-ENGERGIZED)

     


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    Fig. Fig. 41: 1981-83 Diesel EGR (California)

     


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    Fig. Fig. 42: 1981-83 Diesel EGR (49 states)

     


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    Fig. Fig. 43: 1985 Buick 231

     


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    Fig. Fig. 44: 1985-87 Olds 307

     


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    Fig. Fig. 45: 1988-90 Olds 307

     

     
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