DRIVEABILITY COMPLAINTS CAUSED BY EGR VALVE DAMAGE

MODELS AFFECTED: 1987 SKYHAWKS WITH LL8 2.OL OHV ENGINES (VIN CODE 1)

Vehicle driveability symptoms of difficult starting, poor idle, stalling, sag off idle, low-speed surge, low block learn memory (BLM) and closed loop integrator (INT) readings, or idle RPM oscillations of 200-300 RPM can be caused by EGR valve damage.

Verification that the above symptoms are EGR valve damage related are to look for: 1. Obvious tilt of the EGR valve's vertical axis 2. Erratic EGR pintle/stem movement 3. No change in symptoms with disconnected EGR valve vacuum

If observed, replace with the appropriate EGR valve to repair the problem.

Use applicable labor operation.

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.