Had a tick, on 2006 5.4 3v and the tick turned out to be a spark plug on pass side. Replaced all plugs and the ticking stopped. Thought it was cam phaser, just a loose plug.
Had the same ticking on my 2006 expedition with 115750 miles, had a little miss so I had the spark plugs replace. I have no noise. I first thought it was exhaust or cam phaser. Truck now run smooth, no miss and no tick.
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