what the hell is that sound

ses is for 02 sensor. the truck runs great, oil pressure never goes below 35. is it something electrical? i can hear it in the cab, and not so much when im under the hood. it starts at about 2k and goes all the way up with rpms.

 

It might be the alt bearings making the noise, my used to do that when I revd it up, but I hit it wit crc and it doesn't do it any more..
John

 

you don't have a turbo?

Is that the sound you mean, like a whine?

 

yes, i should have described it, my bust

turbo, man i wish

 

sounds like leafs or something getting sucked or stuck in youre radiatoror fan ,check it out.i only say this cause i here a similar sound when it happens to me.

 

Do you have 918 valvesprings?

 

lol nah my fans were off at the time. thanks for the input though

 

no i have 928's why?

 

no thats stupid of me .lol

 

could be a pulley starting to go