So I've got this "whining" noise that's coming from the tranny when it's under load and really cold outside. At least it sure sounds like it's the tranny and all those conditions have to be met. If it's warm or not under load then it never makes a peep.

Has anyone ever heard of this and is it an issue that I should really be concerned about? Oh and it's something I've heard on and off for the last 3 years or so. It's something I always forget about as it's so uncommon..........

Anyhow, any help would be great, thanks.....

 

are you sure its the tranny? A bad pcv valve can give a whine that you are describing.

 

I'm actually not sure it's the tranny, at first I thought maybe PS pump but I've ruled that out. You think a bad PCV valve can do this? Wouldn't the heat from the motor keep it warm enough to eliminate that possibility?

 

Exactly what I was thinking while reading his post...

 

I agree. They can make all kinds of DIFFERENT noises. Specially those fram valves w/tight margins.

 

A motorcraft PCV Valve won't usually do that because of it's wide margins. UNLESS your getting a ton of blow-by. Blow-by is a cold climate thing usually. Short trips don't allow moisture burn off and it adds up, -cakes everything up and freezes.

Ford uses a cold climate sytem which heats the PCV system for these trucks. BUT, some trucks are without therefore making this problem worse.

 

Mine was going nuts years back, when I first bought the truck used from the ford dealership...

Drove it for quite some time with a slight hum (a month maybe, didn't think much of it cuz the issue didn't arise, it was like that when I bought it) mind you it wasn't loud, and other people thought I was crazy cuz they couldn't hear it...

Until one day I shut the truck down and it sounded like a kazoo after shut down while vacuum subsided... started it up got under the hood and felt around and the pcv valve was vibrating like crazy, so I took the kazoo out and replaced it with a new pcv valve from Ford....

 

This was in the summer by the way... also I don't have the heated system...

Mine was just junk...

No other signs or symptoms... just the humming... and no change after replacing besides the humming stopped...

Glad the guts didn't fall out of it like what happened to another member here recently...

 

Hmm, interesting info. Just hard to diagnose as the truck has to be under load and it has to be dam cold outside in order for the noise to rear it's head. You'd almost have to be sitting in the engine bay during acceleration in order to hear it...

 

Pretty easy to diagnose...

Change the pcv for practically nothing...

If you don't hear it ever again...

Diagnosis complete...