For 1990-2009 cars

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

#### VEHICLES AFFECTED: 1982-86 PASSENGER LG4 5.0L (ENGINE CODE H) 1984-86 PASSENGER L69 5.0L (ENGINE CODE G)

THIS BULLETIN IS PENDING PARTS AVAILABILITY, YOU WILL BE ADVISED WHEN PARTS ARE AVATLABLE.

Some vehicles with the above engines may experience a hesitation an a light acceleration. This hesitation is normally seen after an extended idle or a short hot saak in higher ambient temperatures. This candition 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, instalT fuel vapor canister control kit, P/N 10077501 per instruction in kit.

4. Reconnect purge system.

Labour Operation No: T1200

Labour 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.