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Old 08-09-2011
mj550's Avatar
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4.0 sohc noise (might be normal)

I have an 08 4.0 sohc with 46k miles, and Ive had this noise as long as I can remember and it may be totally normal, it seems to be a very slight rattle coming from the driver side in the wheel well area when it is idling, when you increase rpms the noise seems to fade. Its not loud and the engine seems to sound/run smooth. I usually only really notice it when im in a drive thru next to a wall, or if I stick my head down by the drivers side wheel well. I used to own a 2004 ranger with the 3.0 and it made the same type of noise as well, and noticed it in drive thrus also. The truck has motorcraft 5w30 synthetic blend oil and has been changed every 3k. If anyone has any thoughts please share.

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Old 08-09-2011
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My 07 does the same. SOMETIMES. lol drives me crazy, but when I pop the hood and actually look for it, it never seems to want to do it. I have noticed it seems to do it when I have the AC on though.. IDK.
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Old 08-19-2011
Join Date: May 2011
Location: Canton, Michigan
Posts: 53
Check inside the harmonic dampener the weight can become lose and rattle around at low engine speeds. Happend to me it sounded like a rock being shaken in a metal bowl.
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Old 08-24-2011
Join Date: Aug 2008
Location: Taylor, Michigan
Posts: 96
I've got an 08, 4.0 sohc and can't say I've ever noticed any sounds like that.
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Old 08-24-2011
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Join Date: Mar 2011
Location: Victoria B.C.
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mine makes a sound but only when the ac compressor runs
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Old 09-22-2011
Join Date: Jan 2011
Location: Springfield, VA
Posts: 62
Timing chain, maybe? It's problematic on the 4.0.
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