When I'm at a complete stop and have all accessories turned off there is a loud whining noise coming from the middle of the dash. I'm guessing that it is actually coming from the engine compartment. Has anyone experienced this on their truck? It's a 98 4x4 with the 4.6. Could I have a vaccume leak somewhere and thats what the noise is?? If I put the engine in park is seems to go away but then it comes back when in drive and not moving. When the engine is under load. Any ideas??

 

Possible vacuum leak going to one of the actuators in the dash.

 

Turn the selector to "vent". Still here it?

If so - The 98 Vacuum lines plug-in is visible and easy to get at under the dash. if you look in the right spot . Sitting in the driving position about 4" above your right ankle to right is a plug-in with 4 or 5 different colored lines. Check that for leaks.

 

Well I took it in to the Ford dealership and they said the noise I'm hearing is normal and that it was coming from the IAC Valve. Normal my A$$. Nothin but crooks!

 

Do you have an after market intake? Well , IAC 's do make noises . But you said a "whine" - The don't whine that I know of.. I take that back , they do whine when its colder than sh^t out side lol.

When they do whine in that circumstance, it almost sounds just like a bad power steering pump lol .


Read This -

https://www.f150online.com/forums/sh...d.php?t=320754

 

Does the whine sound like this? -

http://s131.photobucket.com/albums/p...nt=snowfun.flv

 

No thank god. Mine is more of a whistling sound. Can hear it at a stop light inside the cab, but as soon as I give it gas, it goes away. :o And yes I do have an aftermarket intake.

 

My 97 had pinhole in the lines that run from the engine to just behind the battery. I found them by keeping the engine running and spraying the lined with a squart bottle. When the sound stopped for a second and returned I looked in that area.

 

The dealership said it's the IAC . You do believe them right ?

 

Sweeet, I have this noise and I think you are right about that....It only happens when its around 0'f ive noticed.