Kaleb trichell

Mines a 2003 f150 4x4 it does the same but could very well also be tires diffrent roads make noises the way the tire grips it.

KireRendrag

I had a whistling sound that happened when I was on the accelerator. It happened about 1500-2000 rpms and stopped when I took my foot off the gas. I've heard some possible explanations:
Bad rear bearing on alternator (happens when cold outside)
Bad belt tensioner bearing (happens constantly)
Transmission going bad

MY FIX: When I bought my '05 King Ranch used, it had a K&N cold air intake installed. I got a used stock air cleaner and air intake assembly from a junkyard for $70. I cleaned it up, took out that CAI, and installed the stock system, and BLAMMO! NO MORE WHISTLING SOUND! No whistle, not at all, nothing! If you have a Cold Air Intake - this could be the source of the noise.

Now my engine is quiet enough that I can hear my belt tensioner bearing whining ever so slightly. Going to replace that next!

Saltydog316

To all with the whistling noise... I bought my 2006 F150 XLT 4.6 a few years ago and the previous owner kept meticulous maintenance documents from the dealer where he had work done. About 4 months ago on a trip I had what sounded like a whistle, but could also have been described as a high pitch squeal that would change pitch with RPMs. After getting home, I began to search for the noise the next day. At first, the noise wasn't there when I started or revved the truck while in park. I drove it and everything seemed okay until it warmed up all the way. Once the truck reach it's full operating temperature then the whistling or high pitch squeal started again. I changed the belt, replaced the spring tensioner, all pulleys, had the AC system replaced and changed the alternator over the next couple of months while chasing it done in hopes of fixing it. The whistle or squeal never seemed to get worse and didn't seem to affect the operation of the vehicle, but I was concerned that it was systematic of a failure which was about to come. After knowing that it wasn't coming from any of those previously replaced items and I didn't believe it was the power steering or water pump either. So, after admitting defeat, I took it to one of my local Ford Dealerships. They couldn't confirm on the first day they had it what was going on and asked to keep it for a second day to which I agreed and didn't have any problem with. The next day the dealership called me and said that they believed it was the torque converter or pump in the front of the transmission. The price to drop and replace was over $2k. The estimate itself was $130 and the service advisor wrote that the mechanic, who was their tranny guy, "suspected" an issue with the torque converter and/or pump. I paid and left not being sure that it had been properly diagnosed and wanted a second opinion. Luckily, I have a friend who works at a tranny shop who took it in and worked on it for a couple hours and said that he wished he could tell me it was the tranny, but had to say it wasn't. The guys at the tranny shop felt sure that it was coming from the back passenger side of the motor, but didn't have time to dig deeper as they had other jobs to work. I appreciated their opinion and that gave me reason to go back to the Ford Dealership and discuss my dissatisfaction with their efforts in diagnosing my truck since they are supposed to be the experts and how I felt about the word "suspected" being used on my repair estimate. I tried to contact the Service Manager who was out and got to speak with the Operations Manager who understood my concerns and asked me to allow him to try and diagnose it again. I agreed and they kept the truck. The next morning he called me and said that he was also sure it wasn't the tranny and thanked me not having the recommended work done because he and the dealership would have had to eat the work on the bad diagnosis. He felt that the noise was also coming from the motor and thought that it may be a bad follower and/or valve and would have to remove the valve cover to confirm. I agreed and got a call from him about an hour and a half later. He said as they were preparing to remove the valve cover another mechanic asked him if they had checked the plugs. He said that is when they discovered that the back two plugs were just loose enough to be sucking air. I was going to replace all the plugs anyway and had already bought the motorcraft plugs and the MSD coil packs and told them I would bring them the parts if they could replace them all for me. He said that he would also recommend a fuel/motor system cleaning since I had this issue. I agreed to all and he said they would cut me a good price on the service. Later that day I got a call that my truck was fixed and no more whistling or squealing was evident. I paid the bill of $319 + my previous $130 for a total of $449 to replace the plugs and coil packs. I felt like it was expensive, but from all the horror stories I had heard about plug replacement on these trucks I figured it was well worth it. Big thanks to Mark the Operations Manger at Jones Ford in Charleston and all of his mechanics for the great work! What could have been another bad dealership story turned out to be a good one. Hope this helps some of you track down your issues. Sorry of the lack of paragraphing or other grammatical errors. Good luck!

Tommy J

Alternator. Mine went away when I got a new one

Mike Hearne

i have 2005 lariat and i get the same spooling noise what is it

SilverSport

who's air filter did you buy???...when I got my truck it had an aftermarket air filter in it that was a touch too short (small) as well as the foam around the air box looked great but in reality it disintegrated when I touched it...

I couldn't source a Motorcraft air filter quick enough so I went with a Fram and I noticed right away that it fit tight compared to the cheap filter that was in there and replacing the foam around the air box (I used m-d brand window seal 1/4" x 1/2" available at most any hardware store) it fixed the moan/air sucking sound as well as keeping the engine from the occasional bogging down while driving...

Good luck with yours...

Bill

dukedkt442

This is the reason why the factory intake has all those noise-canceling baffles... mine has an Air-raid using the factory filter in factory position (looks like the factory intake without the baffles), and I hate how it sounds. More of a whoosh sound though... but the disintegrated foam seal around the air filter "drawer" would cause the higher pitched "turbo" whistle. I also went with the foam window seal.

isvend

I've got some foam window seal laying around, I'm going to try this tonight. Thanks!

60DRB

Ahhh, the whistling pick-up saga.
My '06 4.6 started doing the "turbo spool" noise several years ago.
* Only when the temperature is lower than about 35F (truck stays outside, so cold soaked).
* Only after start until engine starts to warm up.
* Only at lower RPM range (+/- 900-1800 RPM).

I'm pretty sure it's the alternator bearing, but not concerned enough to replace ...yet. It doesn't stay that cold too long down here in Lower Alabama.

HDfastford

just started, truck warmed up, and is in a cycle. Its quiet then gets louder, and louder, and ear piercing loud, then goes away for several, several, 30-60 maybe, seconds, then the cycle starts up again. at any rpm. Any ideas? 03 SUPERCHARGED HD.