Poor Engine Performance-Misfire, Rough

screens being clogged with debris.<br><br> Correction Remove the vent screens and inspect the internal components of the Distributor Ignition System using the procedure listed below. If the distributor base has to be replaced, the vent screens will also have to be removed on the new distributor. If there is evidence of this internal corrosion, replace the affected component.<br><br> Refer to the appropriate procedure in the Engine Controls sub-section of the applicable Service Manual. Important: All of these inspections can be done on-vehicle. 1.<br><br> 1. Inspect the distributor cap. You may notice a white residue on the cap walls.<br><br> For higher mileage occurrences, the interior of the cap may have changed to medium brown in color 2. 2. Inspect the distributor rotor.<br><br> You may notice the presence of black streaks on the plastic surface. More typical evidence would be visible green spots on the copper surface of the rotor segment. 3.<br><br> 3. Inspect the distributor base. You may notice high levels of surface rust on the distributor shaft or surface contamination on the sensor hold down screws.<br><br> 4. 4. Inspect the distributor vent screens (1).<br><br> If the vent screens are present, remove them by using a plastic-handled, long blade awl or pick (2). Insert into the airflow vent screens and pop them out. Refer to the figure for removal procedure.<br><br> If the vent screens have been removed from the base of the distributor, then check the airflow inlets for being clogged with debris. Parts Information Part Number Description 10452458 Cap, Distributor (V6) 10452457 Rotor, Distributor (V6 and V8) 93441559 Distributor (V6) 10452459 Cap, Distributor (V8) 93441558 Distributor (V8) Parts are currently available from GMSPO. Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time J4360 Cap, Distributor - Replace Use published labor operation time J4380 Rotor, Distributor - Replace Use published labor operation time J4530 Distributor Assembly - Replace Use published labor operation time Add To remove Distributor vent screens 0.1 hr GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer".<br><br> They are written to inform these 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.<br><br> See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION © Copyright General Motors Corporation. All Rights Reserved.<br><br>

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