
Originally Posted by
XC700116
As info the typical noise issue is the cam chain guides, tensioner arms and tensioners causing chain slap and throwing the variable timing off. Another usual culprit is the variable timing solenoids.
What causes these problems more than anything, (assuming the oil is changed regularly to begin with) and I hate to even say this because I'd have never believed it if I hadn't learned the hard way, is aftermarket filters that don't have the correct check valve in it. You're time and money ahead to just run the motocraft filter that's made for it. Problem basically comes from over stroking the cam chain tensioners because the pressure isn't held in the system when the motor is shut down. They back off the tension and then have a full stroke to get tension and over time breaks the chain guide from running with the chains loose for a short period of time and slapping on the guide during the first 5 seconds every time the motor is started up.
It's a pain in the ass to do the chain guides and tensioners, but I'd bet money when you pop the front cover off you'll find at least one of them broken.
Also as soon as you pop the valve covers off you can tell if the phasers are bad or not, the spring coil won't be coiled nice and straight when they are good, when they're bad it's pretty obvious cause the plate for the hall effect cam position sensors will be canted off to the side and the spring isn't wound straight anymore.