jeff_the_pilot

Dealer can't hear it. Rode with them and they still can't hear it. I may try to clean the throttle body and see if it does anything.

Dave Goodloe

I have a 2018 5.0 V8, and if it's the same noise that mines experiencing (what sounds like a whistle or whining when the transmission upshifts), when they DO hear it, they will just say that it's normal................which BTW is complete BS.

<-KJP->

Its the new fake turbo noise they are putting on the V8 trucks ;-)

jeff_the_pilot

Dealer service manager said it sounded like his 2015 EcoBoost - I said it was a V8 and he bit his tongue, but seemed eager to help regardless. The tech couldn't hear anything. They said bring it back on Monday and they'll keep trying.

I brought it home and opened the hood and noticed the airbox lid not secured properly. I tried to fix it and noticed it to be fairly difficult to get the male plastic teeth into the female grooves. I think this might be the answer and will confirm tomorrow on my way to work.

Check your air box lids - kinda crazy how difficult it is to properly seat it unless mines defective.

jeff_the_pilot

Drove to work this morning and it still whistles... back to the drawing board and the dealership on Monday.

mountaintruck

I was 'playing' with the whistling noise a bit today. And to be clear, by whistling noise I mean a fairly high pitched noise. Similar to having a rock stuck in the brakes (not it's not that). I put the truck in manual mode so I could hold the RPM right around 1600 - 1700 where I hear the noise. The truck has to be in drive to hear the noise. The second I goto neutral it stops (while still moving and holding the RPMs constant). I had tried this previously, but not while moving.

Next time I will try in 2nd gear vs 3rd gear at 1600 - 1700 RPM.

For the brains on the site I ask this:

If I am working off an air leak theory, either intake or exhaust or other, is there a major difference in the air flow if the truck is in drive VS neutral while holding the exact same low RPM of 1600 - 1700?

mountaintruck

Heard it in both 3rd and 4th over the weekend. The same RPM range 1500 - 2000. Seems to be more pronounced going up a hill.

jeff_the_pilot

I ordered a new throttle body and will install when it arrives to see if that is the issue. I checked for vacuum leaks with carb spray and found nothing. If the new TB doesn't work I'll consider it a normal inherent characteristic. I'll report back in a week or so.

BlueFlame2015

I have a whistle when in neutral. I was going through a drive through and heard it bouncing off the walls. Anyone have this noise in neutral?

jeff_the_pilot

Only while in N? Idle?