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Message: <blockquote data-quote="mirageman" data-source="post: 19992" data-attributes="member: 6542"><p>Your cam phaser, one or both, is unlocked. They're supposed to be locked when idling or off. There are a few threads here that go into this, look at them all for timing chain help. It is indeed failed cam phaser(s). You turn the crank and the chain turns, but not locked with the camshaft. You can see it happen if you look at the chain turning and camshaft,  you'll see they're not locked. Then when the phaser spring tension and/or limit overcomes the valvespring tension, the cam spins over the valve and snaps at the chain slack.  There are quite a few pics and lots of info on other threads here.</p></blockquote><p></p>