Posted by JMOR on November 18, 2013 at 09:18:00 from (72.181.173.171):
In Reply to: 4.3L GMC posted by George Marsh on November 18, 2013 at 08:54:04:
I don't know, George, but you tried NAPA & if GM recognized a problem, then I might expect then to get redesigned parts in the pipe before aftermarket. It appears that this isn't a part problem anyway, but a ventilation problem.
Poor Engine Performance-Misfire, Rough
Idle, Stalls, Engine Cranks but Does Not
Run, SES/Check Engine Light On, DTC
P0300 Set (Inspect Distributor
Ignition(DI) System Components, Replace
as Necessary) #03-06-04-041A - (Jan 28,
2005)
Poor Engine Performance - Misfire, Rough Idle, Stalls, Engine Cranks but Does Not Run,
Service Engine Soon/Check Engine Light Illuminated, DTC P0300 Set (Inspect
Distributor Ignition (DI) System Components and Replace As Necessary)
2001-2003 Chevrolet Astro, Blazer, Express, S-10
2001-2003 GMC Jimmy, Safari, Savana, Sonoma
2001 Oldsmobile Bravada
with 4.3L, 5.0L or 5.7L Gas Engine (VINs W, X, M, R -- RPOs L35, LU3, L30, L31)
This bulletin is being revised to delete a model and add information to subject and
inspection of distributor vent screens. Please discard Corporate Bulletin Number 03-06-
04-041 (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment on poor engine performance and the Service Engine
Soon/Check Engine light being illuminated. Upon investigation, the technician may find
DTC P0300 set.
Cause
This condition may be due to high levels of internal corrosion in the distributor, causing
misfire, rough idle, stall and Engine Cranks But Does Not Run. This corrosion is
attributed to a lack of airflow internal to the cap caused by the vent screens being clogged
with debris.
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. 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. 1. Inspect the distributor cap. You may notice a white residue on the cap walls.
For higher mileage occurrences, the interior of the cap may have changed to
medium brown in color
2. 2. Inspect the distributor rotor. 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. 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.
4. 4. Inspect the distributor vent screens (1). 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. 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". 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. See your GM dealer for information on
whether your vehicle may benefit from the information.
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