Whining noise

[sitdownbrad]

straight up im new to diesels but as of tonight theres like a particular whistle/ scratching noise. It doesnt make it at idle just when you are on the pedal at all. It holds boost fine and shifts great still but its hard to catch. Sounds like the turbo is really slow at spooling? idk and it idles fine its just that wierd scratching/whistle noise

[dray8165]

The turbo on a 7.3 is fairly slow to spool up - when you say "shifts great but its hard to catch" - are you talking about trouble getting it in gear on a manual? You could have a throw-out bearing heading south. Let us know exactly what you are driving and maybe we could help more.

[sitdownbrad]

haha no im mean its hard to catch the noise. my truck is an automatic. no throw out bearing. sorry for not being clear. performance is still great though. i think it just might be me being freaked out by not knowing diesels that well yet.

[dray8165]

One thing it might be - the 7.3 has an exhaust back pressure valve that activates in cold weather. Makes the truck sound like a vacuum cleaner until it warms up. Other than that, I've found that you're MPG is the best determinate if everything is running ok. I bought a ScanGauge II, so I can monitor my instant MPG, and with that I've been able to stay above 19 MPG

[roccodart440]

Check your idler pully.