yeah ive noticed my lmm doing it some also and now that you say that i only usually hear it when its warming up. It almost sounds like its left hand (drivers side) bottom end near the oil pan but never had it looked at though.

 

This may help you.....http://www.dieselplace.com/forum/showthread.php?t=284687&highlight=typewriter+click

 

Dude, good thread!! That's gotta be what it is (the type writter click). I had just changed the oil when I noticed it again and after she's warm, no clickin. Weird stuff man!!

Thanks!

 

i ve noticed my truck makes a chirping squeaking noise when i start it in the morning.it comes from the drivers side and seem to be from the side of the block. it only started doing it this winter and it only does it when the engine is really cold like a over night starts. i live in toronto and some mornings are pretty cold. i plug it in if its really cold but it still does it even when its plugged in. any ideas ??

 

Most likely the belt squeaking. A lot of them do this. Some have switched to the gator belt with good results

 

They all seem to do it??? freaked me out too.

 

Yeah, it's deffinetly what GM is declaring it is. I've never heard of it till this truck. mmmmmm Makes it sound like a piece O sit while it's warming up.