re: F150 code question from check engine light

quote:

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The cam phasers on the 3V 4.6L engines can also tend to be noisy, producing a light knocking sound at idle. This is normal, Ford says. But if the noise is excessive (under 1,200 rpm) or there are cam-related fault codes, the problem may be a bad variable cam timing phaser that needs to be replaced.

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