2003 GMC Envoy Camsahft Position Sensor Location?
- Thread starter SoDone
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Molson02536
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You mentioned a new camshaft position sensor, Don't forget to remove and clean the camshaft position solenoid.
908 is the sensor 421 is the Solonoid.
The one on the front of the block is easy to replace and the cam position sensor actuator solenoid is on the side. To replace the one on the side, where you may also find oil in the electrical connector, the serpentine belt must come off and the power streering pump must be loosened by inserting a socket through the holes in the pulley where there are three bolts.
When reinstalling the new cam sensor, the only alignment is to be sure you don't cross thread the bolts. The sensor can be found at either a GMC dealer or Chevy and it seems to be a bit cheaper if that like you and don't be shy on to asking a tech there on how long it's going to take you to replace the sensor.
Camshaft position actuator solenoid, and you can see the Camshaft sensor just in front of the head under where you add your engine oil.
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Note:
The cam position actuator solenoid has several oil passages passing through the middle of it, covered by a fine mesh screen. If your oil is old, sludge can build up here. If you are not sure of the oil change history, you may want to look at flushing the crankcase at the next oil change. If you don't know the last time it was done, do it now and reset the oil life monitor.
You can trust the oil life monitor instead of going by fixed mileage numbers, so if you have access to a service record and oil changes were done every 6000 to 12,000 miles, depending on the severity of the service, it was probably changed regularly when indicated. (Don't forget this engine takes 7 litres of oil, so longer change intervals are normal.)
If you have no service record, take the VIN to any GM dealer and they can run a history on it if it has ever been serviced by a GM dealer.
If you suspect the oil may not have been changed regularly, dump one can of Seafoam in the crankcase just before the next oil change. Run it for 100 miles or so and then change the oil. (Don't run Seafoam in the crankcase for longer than 100 miles or so.) Also, consider switching to synthetic oil and be sure that only the recommended 5W-30 is put in the crankcase.