WARM/HOT HESITATION FUEL VAPOR CONTROL KIT (P/N)

MODEL AND YEAR: 1982-86 PASSENGER CARS WITH 5.0L (V.I.N. CODE H) ENGINE 1984-86 PASSENGER CARS WITH 5.0L (V.I.N. CODE G) ENGINE

Some vehicles with the above engines may experience a hesitation on a light acceleration. This hesitation is normally seen after an extended idle or a short hot soak in higher ambient temperatures. This condition could be caused by excessive fuel vapor entering the engine through the canister purge system. To determine if the hesitation is from the purge system the following test should be performed:

1. Vehicle should be at normal operating temperature.

2. On 1982-85 models plug canister purge at Y connector in crankcase vent line. On 1986 models plug canister purge at carburetor.

3. Test Drive Vehicle;

a. Hesitation still present, look for other reasons for hesitation (accelerator pump, timing, etc.).

b. Hesitation no longer present, install fuel vapor canister control kit, P/N 10077501 per instruction in kit.

4. Reconnect purge system.

Labor Operation No: T1200 Labor Time : .5 Hours

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.