Rattle when I feather throttle?
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New User
Joined: Sep 2009
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Rattle when I feather throttle?
Wondering if someone can help me. I have a 2005 f-150 with the 5.4L and there is a rattle in the top passenger side of the engine when I feather the throttle. That is the only time it does it consistently. I have also heard a very loud knocking while the truck is under strain while in drive and reverse. It sounds like a hammer on sheet metal. Any ideas?
Elder User
Joined: Jul 2008
Posts: 554
Likes: 1
From: Newport, Wa.
The rattle from the passenger side sounds like the old cam phaser noise these engines have. But the loud knocking while under a strain? Where does it sound like it's comming form? engine or underneath?
Senior User
Joined: Mar 2008
Posts: 444
Likes: 1
From: Vermont
It may be an exhaust manifold leak. I had a ticking noise coming from the passenger side wheel well that I had under strain and it was there constantly but more prominent in overdrive. I thought it was the cam phaser but I brought it in and turns out it was the exhaust leak. Sounds fine now!
Junior User
Joined: Sep 2003
Posts: 64
Likes: 0
From: up state VT
Something to try. Get some crankcase flush and flush your oil system. Do this twice if you have the time and $$$$$. Do both the oil and filter. Add some top shelf synthetic oil and a new Motocraft filter and check the noise again. Pay close attention to your filters and run your oil through a screen when you drain it. Look for pieces of metal and rubber(from a bad filter).
I just trashed a 05 5.4 by using an aftermarket filter. The upper end on the passenger side was rapping loudly due to a plugged oil port. I flushed it and the filter was loaded with metal and pieces of rubber. Refilled with Royal Purple and a Motocraft filter and all is quiet.....For now. Running on borrowed time now until the damaged parts give up....
I just trashed a 05 5.4 by using an aftermarket filter. The upper end on the passenger side was rapping loudly due to a plugged oil port. I flushed it and the filter was loaded with metal and pieces of rubber. Refilled with Royal Purple and a Motocraft filter and all is quiet.....For now. Running on borrowed time now until the damaged parts give up....
I will let you know how things go. Thanks
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