INDUCTION ROAR FROM ENGINE CHECK AIR CLEANER NUT TORQUE

MODELS: 1987 S/T TRUCK WITH 2.5L (VIN CODE E) L4 ENGINE

Some 1987 S/T trucks with 2.5L L4 engines may exhibit unsatisfactory levels of engine induction noise due to overtorqued wing nuts on the air cleaner cover. This condition causes the air cleaner cover to become distorted, leaving a small gap between the cover and the air filter element and could also cause the air filter element to become crushed (See Figure No. 1). If this condition is encountered, remove the air cleaner cover and check for damage. Repair the cover if required. Check the air filter element for signs of distortion or crushing (See Figure No. 1). Replace the air filter element if damaged. Reinstall the air cleaner cover and wing nuts. Torque wing nuts to 1.6 - 2.4 Nm (14-21 lb in).

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.