Repair Pontiac Mid-size 1974-1983 Repair Guide

Vacuum Diagrams

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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 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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Fig. Fig. 1 Vacuum hose routing for the 1979 151 cu. in. VIN 1 engine-California models



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Fig. Fig. 2 Vacuum hose routing for the 1979 151 cu. in. VIN V engine-low altitude models with automatic transmission and A/C



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Fig. Fig. 3 Vacuum hose routing for the 1979 151 cu. in. VIN V engine-low altitude models without A/C



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Fig. Fig. 4 Vacuum hose routing for the 1979 231 cu. in. VIN A engine-low altitude models with manual transmission



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Fig. Fig. 5 Vacuum hose routing for the 1979 231 cu. in. VIN A engine-low altitude models with automatic transmission



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Fig. Fig. 6 Vacuum hose routing for the 1979 231 cu. in. VIN A engine-California models with manual transmission



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Fig. Fig. 7 Vacuum hose routing for the 1979 231 cu. in. VIN A engine-high altitude and California models with automatic transmission



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Fig. Fig. 8 Vacuum hose routing for the 1979 301 cu. in. VIN Y engine-2-bbl. carbureted models with automatic transmission and A/C



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Fig. Fig. 9 Vacuum hose routing for the 1979 301 cu. in. VIN Y engine-2-bbl. models with automatic transmission, but without A/C



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Fig. Fig. 10 Vacuum hose routing for the 1979 301 cu. in. VIN W engine-4-bbl. models with manual transmission



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Fig. Fig. 11 Vacuum hose routing for the 1979 301 cu. in. VIN W engine-4-bbl. models with automatic transmission and A/C



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Fig. Fig. 12 Vacuum hose routing for the 1979 301 cu. in. VIN W engine-4-bbl. models with automatic transmission, but without A/C



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Fig. Fig. 13 Vacuum hose routing for the 1979 305 cu. in. VIN G engine-2-bbl. low altitude models



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Fig. Fig. 14 Vacuum hose routing for the 1979 305 cu. in. VIN G engine-2-bbl. California models



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Fig. Fig. 15 Vacuum hose routing for the 1979 305 cu. in. VIN H and 350 cu. in. VIN L engines-4-bbl. California and high altitude models



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Fig. Fig. 16 Vacuum hose routing for the 1979 350 cu. in. VIN X engine-4-bbl. models



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Fig. Fig. 17 Vacuum hose routing for the 1979 350 cu. in. VIN R engine-4-bbl. California models



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Fig. Fig. 18 Vacuum hose routing for the 1979 350 cu. in. VIN R engine-4-bbl. high altitude models



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Fig. Fig. 19 Vacuum hose routing for the 1979 350 cu. in. VIN R engine-except California and high altitude models



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Fig. Fig. 20 Vacuum hose routing for the 1979 350 cu. in. VIN R engine-California models



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Fig. Fig. 21 Vacuum hose routing for the 1980 231 cu. in. VIN A engine-manual transmission models without C-4



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Fig. Fig. 22 Vacuum hose routing for the 1980 231 cu. in. VIN A engine-automatic transmission models without C-4



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Fig. Fig. 23 Vacuum hose routing for the 1980 265 cu. in. VIN S engine



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Fig. Fig. 24 Vacuum hose routing for the 1980 265 cu. in. VIN S engine-models with lock-up torque converter



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Fig. Fig. 25 Vacuum hose routing for the 1980 301 cu. in. VIN W engine



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Fig. Fig. 26 Vacuum hose routing for the 1980 301 cu. in. VIN W engine-models with lock-up torque converter



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Fig. Fig. 27 Vacuum hose routing for the 1980 305 cu. in. VIN H engine



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Fig. Fig. 28 Vacuum hose routing for the 1980 350 cu. in. diesel engine-low altitude federal models



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Fig. Fig. 29 Vacuum hose routing for the 1980 350 cu. in. diesel engine-California models



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Fig. Fig. 30 Vacuum hose routing for the 1981 231 cu. in. engine-models with automatic transmission



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Fig. Fig. 31 Vacuum hose routing for the 1981 350 cu. in. diesel engine



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Fig. Fig. 32 Vacuum hose routing for the 1982 231 cu. in. engine



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Fig. Fig. 33 Vacuum hose routing for the 1983 231 cu. in. engine-2-bbl. California models with automatic transmission



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Fig. Fig. 34 Vacuum hose routing for the 1983 231 cu. in. engine-2-bbl. federal models with automatic transmission

 
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