Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISSTARTING AND CHARGINGSTARTING SYSTEMDESCRIPTION AND OPERATIONSYSTEM DESCRIPTION
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
System Description
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION System Description
CRANKING CIRCUIT
The cranking circuit consists of the battery, starter motor, ignition switch, neutral start switch. If it becomes apparent that there is an electrical failure, refer to Starting System Check.
STARTER MOTOR
Two different starter motors are used on these engines.
The PG-260 achieves gear reduction at a ratio of 5:1 through planetary gears. It's relatively small size and light weight and offers improved cranking performance and reduced current requirements for the gasoline engines. Two versions of the PG-260 are used. The PG-260F2 is used on the 4.3L and 5.0L, it can be identified by the white ground wire at the starter solenoid. The PG-260M is used on the 5.7L and 7.4L, it can be identified by the black ground wire at the starter solenoid and has external through bolts.
The 28-MT, used on the 6.5L diesel engine, is a gear reduction starter with an over running roller type clutch and enclosed shift lever. Enclosed shift lever cranking motors have the shift lever mechanism and the solenoid plunger enclosed in the drive housing, protecting them from exposure to dirt, icing conditions, and splash.
Solenoid windings are energized when the ignition switch or engine control switch is in the start position. The resulting plunger and shift lever movement causes the pinion to engage the engine flywheel ring gear, the solenoid main contacts to close, and cranking takes place. When the engine starts, the pinion over running clutch protects the armature from excessive speed until the ignition switch or engine control switch is released, at that time the plunger return spring causes the pinion to disengage. To prevent excessive overrunning, release the ignition switch or engine control switch from the crank position as soon as the engine starts.
The cranking circuit consists of the battery, starter motor, ignition switch, neutral start switch. If it becomes apparent that there is an electrical failure, refer to Starting System Check.
STARTER MOTOR
Two different starter motors are used on these engines.
The PG-260 achieves gear reduction at a ratio of 5:1 through planetary gears. It's relatively small size and light weight and offers improved cranking performance and reduced current requirements for the gasoline engines. Two versions of the PG-260 are used. The PG-260F2 is used on the 4.3L and 5.0L, it can be identified by the white ground wire at the starter solenoid. The PG-260M is used on the 5.7L and 7.4L, it can be identified by the black ground wire at the starter solenoid and has external through bolts.
The 28-MT, used on the 6.5L diesel engine, is a gear reduction starter with an over running roller type clutch and enclosed shift lever. Enclosed shift lever cranking motors have the shift lever mechanism and the solenoid plunger enclosed in the drive housing, protecting them from exposure to dirt, icing conditions, and splash.
Solenoid windings are energized when the ignition switch or engine control switch is in the start position. The resulting plunger and shift lever movement causes the pinion to engage the engine flywheel ring gear, the solenoid main contacts to close, and cranking takes place. When the engine starts, the pinion over running clutch protects the armature from excessive speed until the ignition switch or engine control switch is released, at that time the plunger return spring causes the pinion to disengage. To prevent excessive overrunning, release the ignition switch or engine control switch from the crank position as soon as the engine starts.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.