Emissions - Reduced Performance Or Sag

Number 85-6(Gasoline)-26 Date 5/85
Subject: REDUCTION IN PERFORMANCE ON ENGINE WARM-UP OR FROM A HOT ENGINE

1983 THRU 1985 FIREBIRD
Some 1983 thru 1985 Firebirds may experience a reduction in engine performance or sag under normal acceleration. This condition occurs during engine warm-up or occurs with a hot engine.

To repair the condition, check for proper THERMAC operation as shown in Section 6E1 of the Pontiac Service Manual. If proper performance of the THERMAC is confirmed, refer to Bulletin 84-6 (Gasoline)-54 for the fuel vapor lock kit in Step #7.