GM Firebird 1967-1981 Repair Guide

Air Cleaner

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GENERAL INFORMATION & SERVICE



See Figures 1 through 22

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Fig. Fig. 1: Exploded view of the air cleaner used on 1968-69 OHC 6-cylinder engines



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Fig. Fig. 2: Exploded view of the air cleaner used on 1970 OHV 6-cylinder engines



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Fig. Fig. 3: Exploded view of the air cleaner used on 1968 8-cylinder engines



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Fig. Fig. 4: Exploded view of the air cleaner used on 1969-70 8-cylinder engines



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Fig. Fig. 5: Exploded view of the heated air cleaner used on 1971-72 8-cylinder engines with 2-bbl. carburetors



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Fig. Fig. 6: Exploded view of the heated air cleaner used on 1971-72 8-cylinder engines with 4-bbl. carburetors



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Fig. Fig. 7: Exploded view of the heated air cleaner assembly used on all 1973 engines



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Fig. Fig. 8: Exploded view of the Ram Air filter assembly used on 1969 models



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Fig. Fig. 9: Exploded view of the Ram Air baffle and hood scoop and cable adjustment procedure



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Fig. Fig. 10: Exploded view of the 1970 Trans Am 8-cylinder air cleaner



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Fig. Fig. 11: Exploded view of the Ram Air filter assembly 1970-72 models



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Fig. Fig. 12: For 1970-81 8-cylinder engines, remove the hold-down wing nut



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Fig. Fig. 13: Now lift the lid off of the air cleaner housing ...



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Fig. Fig. 14: ... and remove the air cleaner element



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Fig. Fig. 15: If the entire air cleaner housing is to be removed, detach the air inlet hose ...



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Fig. Fig. 16: ... and the breather hose from the housing, then lift the air cleaner assembly off of the carburetor



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Fig. Fig. 17: Loosen and remove the hold-down wing nut 1967 8-cylinder engine shown



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Fig. Fig. 18: Remove the air cleaner lid ...



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Fig. Fig. 19: ... and the air cleaner element from the bottom plate



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Fig. Fig. 20: When working with fuel or brake lines, always use flare nut wrenches to prevent damaging the lines



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Fig. Fig. 21: Disconnect the fuel supply line at the carburetor note the second wrench used to hold the fitting



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Fig. Fig. 22: Remove the fitting and the fuel filter this filter is made of paper, some are sintered bronze

The air cleaner consists of a metal housing for a replaceable paper filter or permanent polyurethane element and the necessary hoses connecting it to the crankcase ventilation system. The air cleaner cover is held by a wing nut on all models. If your Firebird is equipped with a paper element, it should be replaced once every 12,000 miles (every 15,000 miles for 1975-81 models) or 12 months, whichever comes first. Inspection and replacement should come more often when the car is operated under dusty conditions. To check the effectiveness of your paper element, remove the air cleaner assembly and, if the idle speed increases noticeably, the element is restricting airflow and should be replaced.

High-performance models, or cars equipped with optional air cleaners, use a polyurethane element that must be removed, cleaned, and re-oiled at 12,000 miles (every 15,000 miles for 1975-81 models) or 12 month intervals. Remove the filter and clean it in an appropriate solvent designed for this. Do not use paint thinner or a similar solvent, as it will attack the foam. Soak it in the solvent and squeeze it dry. Allow it to soak in SAE 30 oil and again squeeze it dry using a clean cloth to remove excess oil.

High-performance models equipped with the cold air induction system have a dual stage air cleaner. The inner element is paper and must be replaced every 12,000 miles or 12 months, while the outer element is polyurethane and is cleaned as outlined previously. Clean the inside of the air cleaner housing before reinstalling either type of filter.

 
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