Lincoln LS
 

It is a wonderful car! However, it makes a whining noise thats especially noticable at 3000 rpm or so. Any ideas? It looks like the airbox has been fiddled with.

sometimes cars make a whining noise because the little rubber hose on intake has been taken off or has slipped off...its hard to desribe some cars have a rubber house from the valve cover(i think not sure) back to the intake that can make a whining whistlin howling noise sometimes can sound like an air horn lol

make sure all hoses are in place and that all nipples have a hose or are capped off around the intake and top of the engine

im not even remotly positive that that could be whats happening but its easy enough to check :mrgreen:

Need to be more specific here-- where is the whine coming from--does it slightly oscillate with RPMs? What sort of whine--high pitched (like air), or lower pitched (like a gear).

BTW, back when I was in Dearborn, I got to drive a LS-R prototype, with supercharged V-8, slammed suspension, and full roll-cage interior--that thing was a (large) go-kart!

I drove an LS quite a few times, one think that always annoyed me is that I could never figure out how to start in 1st gear. It seemed like after awhile it would let me shift to first from a dead stop, other times not. What was with that?

id imagine the whine is a a/c pump problem, although it will continue working, they often (when problematic) cause a wine... id have to know more about the noise to make a better judgment. i doubt its just loose blets, or in the air box as it doesnt charge the air at a high enough rate to cause a compression/rarefaction resonance.
hope it helps

That hose from the valve cover is called the PCV (positive crank ventilation) valve.

BTW: alot of times the whine is the actual intake if there isn't a very strong silencer on it it's noticeable more with an aftermarket intake on larger engines.

wow, look at this Noob!

http://img65.imageshack.us/img65/2862/noobhk9.jpg

pwnnnnned!