Darrell111

I have tried to find this air leak but cant seem to locate it. It only whistles while driving. It changes with engine rpm and seems to be constant. Not certain because at higher speeds there is to much wind noise to hear it.
Any ideas for this?

Snoopjonnyjon

It could be one of the vacuum lines that runs into the cab to operate the heater ducts.

It's also possible that Bubb Rubb had access to your vehicle. Wooo wooooo!

Darrell111

its definitely coming from the engine compartment though

coldbrains21379

Check exhaust system for leaks. I had a crack in the y pipe close to the O2 bung and it made my truck whistle like the intro to Andy grifith.

Darrell111

it does have an exhaust leak that quiets down after a few minutes of driving. Never heard one whistle before though

Moose_God

My '86 with the 5.0 used to do this too...sounded like it had a turbo almost. Never did figure it out. Maybe an intake leak?

Darrell111

Maybe the rear of the lower intake. I found new oil leaks, 2 drips spots on the ground. Looks like it rolling around the trans bell. Can't really see back there because of that pipe