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Chevrolet Silverado / GMC Sierra. Manual - part 2135
5. If the pintle of the CMP magnet is binding or does not move within the proper range of
travel, replace the CMP magnet as an assembly.
CAMSHAFT POSITION ACTUATOR SOLENOID VALVE INSPECTION (ON-VEHICLE)
Fig. 81: View Of Proper Valve Spool Position
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not use the camshaft position (CMP) actuator solenoid
valve again. Install a NEW valve during assembly. The
inspection procedure below is provided for on-vehicle
diagnostic purposes only.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
1. With the CMP magnet removed, inspect for a sticking valve spool or broken valve spool
spring.
2. Depress the valve spool into the housing. The valve should move freely with no binding or
sticking and minimal resistance inward. When released, the valve spring should return the
spool to the proper extended position (1) of 6.08-6.12 mm (0.239-0.241 in).
CAMSHAFT POSITION ACTUATOR SOLENOID VALVE INSPECTION (OFF-VEHICLE)
Fig. 82: View Of CMP Inspection Points
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not use the camshaft position (CMP) actuator solenoid
valve again. Install a NEW valve during assembly. The
inspection procedure below is provided for off-vehicle
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
1. Inspect the CMP valve for the following conditions:
Dirt, debris, or restrictions within the oil passages (1)
Damaged threads (2)
If the threads of the valve are damaged, also inspect the threads in the front of the
camshaft for damage.
Dirt, debris, or restrictions within the oil inlet check valve (3)
If debris is detected, the engine assembly should be inspected to determine the source
of contamination.
diagnostic purposes only.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 83: View Of Proper Valve Spool Position
Courtesy of GENERAL MOTORS CORP.
2. Inspect for a sticking valve spool or broken valve spool spring.
3. Depress the valve spool into the housing. The valve should move freely with no binding or
sticking and minimal resistance inward. When released, the valve spring should return the
spool to the proper extended position (1) of 6.08-6.12 mm (0.239-0.241 in).
VALVE ROCKER ARM AND PUSH ROD CLEANING AND INSPECTION
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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