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- June 16, 2003
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SOHC guys--nothing for you in here!
Does your explorer-mountaineer have an under hood whine, squeal, chirp, squeak,squeaking, whinning, bird chirp,sqealing, whirring, noise which tests your skills?
Well, it could be the camshaft position sensor drive unit-or cmp synch drive
Remove serpentine belt, run engine briefly, if noise persists with belt off, this is your noise. Camshaft position sensor- CMP synch drive shaft, which is notorious for failure on V-8 engines.
For more detail you can refer to this video . Thanks [MENTION=229411]makuloco2000[/MENTION] for posting it up.
Here is a link for the 1st generation ( 1991-1994) 4.0 OHV engine, also used in some 2nd gen explorers from 1995-up. Yes, even a 91-92 will have a "stub shaft" to drive the oil pump. Some 93, and all 94 models have an electrical sensor on top of the oil pump drive unit.
http://www.explorerforum.com/forums/showthread.php?t=275008
Since the noise is sometimes intermittent, you may want to leave belt off and perform test several times at 10-30 minute intervals, running engine only briefly each time, < 1 minute
If you are satisfied the noise isn't present without belt, rotate each pulley, and idler by hand. This should find any front engine bay, accessory drive, serpentine noise you encounter.
I hope this helps.
Fix it by reading this first
http://www.explorerforum.com/forums/showthread.php?t=89670&highlight=camshaft+position+sensor+tool
More replacement part info
http://www.explorerforum.com/forums/showthread.php?t=260979&highlight=cam+sensor
notice the thinner material used for rolling the pin on the dorman unit. This has been know to cause failure soon after replacement.
Does your explorer-mountaineer have an under hood whine, squeal, chirp, squeak,squeaking, whinning, bird chirp,sqealing, whirring, noise which tests your skills?
Well, it could be the camshaft position sensor drive unit-or cmp synch drive
Remove serpentine belt, run engine briefly, if noise persists with belt off, this is your noise. Camshaft position sensor- CMP synch drive shaft, which is notorious for failure on V-8 engines.
For more detail you can refer to this video . Thanks [MENTION=229411]makuloco2000[/MENTION] for posting it up.
Here is a link for the 1st generation ( 1991-1994) 4.0 OHV engine, also used in some 2nd gen explorers from 1995-up. Yes, even a 91-92 will have a "stub shaft" to drive the oil pump. Some 93, and all 94 models have an electrical sensor on top of the oil pump drive unit.
http://www.explorerforum.com/forums/showthread.php?t=275008
Since the noise is sometimes intermittent, you may want to leave belt off and perform test several times at 10-30 minute intervals, running engine only briefly each time, < 1 minute
If you are satisfied the noise isn't present without belt, rotate each pulley, and idler by hand. This should find any front engine bay, accessory drive, serpentine noise you encounter.
I hope this helps.
Fix it by reading this first
http://www.explorerforum.com/forums/showthread.php?t=89670&highlight=camshaft+position+sensor+tool
More replacement part info
http://www.explorerforum.com/forums/showthread.php?t=260979&highlight=cam+sensor
notice the thinner material used for rolling the pin on the dorman unit. This has been know to cause failure soon after replacement.