wierd noise on start up???

[MUDSTROKIN']

when i start my truck when it's cold and sometimes when i start it when the eng temp is under 100* a second or 2 after is starts theres a sound from the engine that sound like a squeak? like an old door hinge when it's opened? if that makes since... what could this be? it only squeaks for a second then stops

[fordmasterdieseltech]

need to have someone start itt while your under the hood, and try to pinpoint the location or possibly the source of the noise. if you can figure out tthe location alteast, we might be able to better assist you.

[VeeDubTDI]

Sounds like the classic 6.0 squeak. Mine did this, and the dealer replaced my alternator under warranty. Two years later, it's squeaking again. *shrug*

[MUDSTROKIN']

So it's the alternator squeeking? that's wierd.... and i wonder why yours is doing it again??? do you know what causes it? does it damage anything or get worse?

[VeeDubTDI]

I don't know what causes it... something about the design of the pulley and/or bearing, I suppose. Most 6.0s that I've heard have this problem, especially when the weather is cool and humid. I suspect that the problem came back for me because the dealer replaced the original alternator with a similar one (that also develops the problem).

[Lucy06]

Was this a constant squeak or only a periodic squeak. I am trying to figure out what is squeaking on my truck. Usually after running on the freeway for a while. It happens after I get off the freeway and am coasting around 30 mph I hear a er er er er sound and when I stop it goes away until I get back to about 30 and let off the throttle.

[VeeDubTDI]

It starts off as a periodic squeak, usually starts in cool humid weather or when it's raining. It develops into a constant squeak over time.

What you're experiencing doesn't seem like it's the same thing. Is yours RPM dependent or vehicle speed dependent?