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Old 08-11-2009, 12:30 PM   #1
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Default 5.4 knock, possible timing chain tensioner

I just bought an 05 SCREW 5.4 4x4 with 107K miles on it. I didn't notice any engine noises when I bought it other than the normal "diesel" sound that most of these trucks make. However, after I had it for a couple of weeks, I noticed a knocking/slapping sound at barely above idle. And I mean barely above idle!!! You give it very much gas and it goes away completely!. Also, it only does it after the engine has reached normal operating temp. I took it to a local mechanic and he said it sounds like the timing chain slapping. He quoted me a very costly repair to replace the chains, tensioners, guides, and gears --> $1300. I changed the oil about a week ago and used Pennzoil 5w20 synthetic with a Motorcraft filter. Ironically, that is about the time I started noticing the noise. Just coincidence???
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Old 08-12-2009, 10:40 AM   #2
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It could be because the place you bought it had used a thicker oil to mask the noise...Could it be cam phasers?
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