LOW POWER/BLACK EXHAUST SMOKE (SEAL FENDER OPENING)

SUBJECT: LOW POWER/BLACK EXHAUST SMOKE (SEAL FENDER OPENING AND REPLACE AIR CLEANER ELEMENT)

MODELS: 1992-93 C/K TRUCKS WITH 6.5L TURBO DIESEL ENGINE (RPO L65)

CONDITION

Owners of some 1992-93 C/K trucks equipped with 6.5 diesel engine (RPO L65) may comment that the air cleaner element becomes plugged with dust. The engine may have low power and/or black exhaust smoke on moderate throttle due to a restriction of air flow. This condition occurs primarily when the truck is driven on unpaved roads.

CAUSE

It has been determined that the primary path for dust entering the induction system is through the hole created where the right side inner and outer fender come together next to the soft bumper filler panel.

CORRECTION

To correct this condition, close the hole with silicone caulking, RTV, or any suitable material that will remain flexible and not fall out. Be sure the sealing material is completely cured prior to driving the truck.

A revised air cleaner element (P/N 25099849) with a removable poly-wrap outer foam material has been released. When necessary, the foam can be removed from the element, washed, dried, and reinstalled. If service to the new air cleaner is required, do not use high pressure air to clean the paper element. Lightly tap it on a flat surface to shake loose excess dust prior to carefully reinstalling the poly-wrap cover.

SERVICE PARTS INFORMATION

Part Number Description Quantity/Vehicle ------ ----------- ---------------- 25099849 Air Cleaner Element 1

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Op Description Labor Time -------- ----------- ---------- J5000 Replace Air Cleaner See Applicable Element Labor Time J5020 Seal, Inner Fender Guide Opening

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.