High Pitched Whistle Coming from Engine in Cold Weather?
#16
Went and drove it at lunch (1 degree out) after the truck sitting for about 5 hours outside. I hear the whistle at 1900-2000 RPMs and only for a second. I could only get it to make the whistle under acceleration. It sounds like it is coming from the divers side of the engine compartment up by the dash. Is the PCV in that area?
We did get snow last night, and the previous times i heard this we had snow. Maybe there is some corilation with moisture and temperature?
We did get snow last night, and the previous times i heard this we had snow. Maybe there is some corilation with moisture and temperature?
#17
Originally Posted by Rochester
Frozen PCV Orifice? One of the largest problems in a PCV system is the freezing of the valve. Well on the F-150 there is a long tube that extends into the intake manifold, and there is no valve. It resembles something like a 3/8 diameter straw. The end of the straw can start to freeze over in extremely cold weather. The PCV “valve” is electronically heated, but it takes a few minutes to melt any freeze up. With only a small area not being frozen over this may be causing a whistle. Be careful if you try to remove the PCV valve, there is an “O” ring that you do not want to damage.
Originally Posted by PaleRiderosu
Went and drove it at lunch (1 degree out) after the truck sitting for about 5 hours outside. I hear the whistle at 1900-2000 RPMs and only for a second. I could only get it to make the whistle under acceleration. It sounds like it is coming from the divers side of the engine compartment up by the dash. Is the PCV in that area?
We did get snow last night, and the previous times i heard this we had snow. Maybe there is some corilation with moisture and temperature?
We did get snow last night, and the previous times i heard this we had snow. Maybe there is some corilation with moisture and temperature?
Duke
#18
I've heard the whistling sound on occasion, but I don't think the noise from my truck is quite as bad as the sound you describe. However, I had noticed a knocking/thumping noise that seemed to be getting louder over the last several months. (This noise is best described as similar to the sound made by a distant helicopter.) I only heard this noise under acceleration--if I took my foot off the gas, it disappeared.
Based on information I read in another thread, I checked the air intake tube where it joins the driver's side fenderwell. Although the intake appeared to be securely fastened to the fenderwell, I found that the assembly can be moved somewhat. Also, the plastic circular piece that surrounds the point where the intake enters the fenderwell can be moved as well. I adjusted both the intake and the plastic ring to ensure they were as secure as I could possibly make them.
This morning (temps around 25 degrees), I didn't hear the whistling noise, and the knocking sound I described above was greatly reduced.
It's my guess that the whistling and the knocking/thumping noises are related to the intake connection at the fenderwell. Try adjusting this connection and see if the noise subsides.
Good luck!
Based on information I read in another thread, I checked the air intake tube where it joins the driver's side fenderwell. Although the intake appeared to be securely fastened to the fenderwell, I found that the assembly can be moved somewhat. Also, the plastic circular piece that surrounds the point where the intake enters the fenderwell can be moved as well. I adjusted both the intake and the plastic ring to ensure they were as secure as I could possibly make them.
This morning (temps around 25 degrees), I didn't hear the whistling noise, and the knocking sound I described above was greatly reduced.
It's my guess that the whistling and the knocking/thumping noises are related to the intake connection at the fenderwell. Try adjusting this connection and see if the noise subsides.
Good luck!
#19
#20
Originally Posted by C-17 Pilot
I've heard the whistling sound on occasion, but I don't think the noise from my truck is quite as bad as the sound you describe. However, I had noticed a knocking/thumping noise that seemed to be getting louder over the last several months. (This noise is best described as similar to the sound made by a distant helicopter.) I only heard this noise under acceleration--if I took my foot off the gas, it disappeared.
Based on information I read in another thread, I checked the air intake tube where it joins the driver's side fenderwell. Although the intake appeared to be securely fastened to the fenderwell, I found that the assembly can be moved somewhat. Also, the plastic circular piece that surrounds the point where the intake enters the fenderwell can be moved as well. I adjusted both the intake and the plastic ring to ensure they were as secure as I could possibly make them.
This morning (temps around 25 degrees), I didn't hear the whistling noise, and the knocking sound I described above was greatly reduced.
It's my guess that the whistling and the knocking/thumping noises are related to the intake connection at the fenderwell. Try adjusting this connection and see if the noise subsides.
Good luck!
Based on information I read in another thread, I checked the air intake tube where it joins the driver's side fenderwell. Although the intake appeared to be securely fastened to the fenderwell, I found that the assembly can be moved somewhat. Also, the plastic circular piece that surrounds the point where the intake enters the fenderwell can be moved as well. I adjusted both the intake and the plastic ring to ensure they were as secure as I could possibly make them.
This morning (temps around 25 degrees), I didn't hear the whistling noise, and the knocking sound I described above was greatly reduced.
It's my guess that the whistling and the knocking/thumping noises are related to the intake connection at the fenderwell. Try adjusting this connection and see if the noise subsides.
Good luck!
Duke
#21
#23
Well, I got the squeal last night. It is a very loud high pitched squeal that lasted for about 20 seconds. Once the truck startedw warming up, it disappeared. The temp yesterday never broke above -15 degrees outside. The temp with the wind chill was approaching -40 degrees. DAMN!!! THAT'S COLD!!!
#24
Mine did it this morning as well, squealed EXTREMELY loud for quite awhile. It was not belt related, like someone else posted it was more of a metal sound. I turned the heater off immediately as soon as it started doing it, but it continued making the noise for a couple more minutes with the hvac controls off. The truck was not moved the entire time it did it. I just started it, and then it started making the noise... I about shut it off, because the noise was so loud I figured the neighbors were about to come out... The truck is a bone stock 06' F-150 4x4, with the 5.4. The truck only has 160 total miles on it...
#26
Originally Posted by jdwheels@***.ne
BUMP
Anybody figure this cold air whistle out yet? Mine is doing it again, it has a new belt so I know its not that.
Anybody figure this cold air whistle out yet? Mine is doing it again, it has a new belt so I know its not that.
Duke
#27
I've had a constant high pitched whine for the past year or more. It just started one day and has never stopped since. No mods or anything of the sort at all. Typical oil filters from Motorcraft or Fram and air filter from K&N. Every single time I am giving it gas it makes the noise and doesn't stop until I take my foot off the gas pedal. What it is I've no idea. It the most annoying thing in the world and I cannot wait to get rid of this truck when the '09's come out. It's not like a little annoying rattle or noise here n there (I have those too), this is just horrible. Paying 42k for a truck that does this just isn't right. Time can't go by fast enough for me, I need a new 150 big time, one that doesn't drive me crazy insane with engine whine.
#28
Originally Posted by CometFlash
I've had a constant high pitched whine for the past year or more. It just started one day and has never stopped since. No mods or anything of the sort at all. Typical oil filters from Motorcraft or Fram and air filter from K&N. Every single time I am giving it gas it makes the noise and doesn't stop until I take my foot off the gas pedal. What it is I've no idea. It the most annoying thing in the world and I cannot wait to get rid of this truck when the '09's come out. It's not like a little annoying rattle or noise here n there (I have those too), this is just horrible. Paying 42k for a truck that does this just isn't right. Time can't go by fast enough for me, I need a new 150 big time, one that doesn't drive me crazy insane with engine whine.
I agree though it is a joke. Needless to say my dealer was less then helpful last year. I believe wait till it's warmer was their response. Great I bought a warm weather vehicle only for $42k.
Duke
#29
#30