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Strange noise from 04 5.4l

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Old 12-20-2008, 08:07 AM   #1
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Default Strange noise from 04 5.4l

Hello all, just bought my first 150 and love it.

how ever i have a question. i bought this truck right before it got cold and everything ran great. Now that it is cold it is making a strange engine noise. This noise happens at any speed or even if the truck is just sitting there idling. Some times i think there is a pattern after 60m/h but then it will do it at 35m/h. The best way i can discribe the noise is think of what happens when someone gets to close to a microphone, it makes a fast highpitched whistle. This is more of a slower lower pitch tone. it can last anywhere from 5 secs to 3 minutes.

the truck is stock except for k&n air filter.

any help would be greatly appreciated and this is a great site by the way.

thnaks
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Old 12-20-2008, 03:20 PM   #2
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Do a google search for Cam Phaser noise.
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Old 12-20-2008, 06:42 PM   #3
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i watched the mustang video, thats more knocking. the truck doesnt sound anything like that. is the whistling i am hearing part of that somehow?

ta
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Old 12-20-2008, 07:18 PM   #4
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Is the air filter box sealed up good. Sometimes when the K&N filter is installed it does not seal the box up properly. This may be your whislting noise.
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Old 12-21-2008, 09:05 AM   #5
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i will check it out again thankyou
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Old 04-02-2011, 12:01 AM   #6
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have same whistling noise at certain speeds....drives me insane!!!...03 f150n4x4 super crew....completely stock
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Old 04-04-2011, 07:03 PM   #7
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I found a small crack in the pcv tube and taped it up temporarily and haven't heard the whistle since.....
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Old 04-20-2015, 01:08 PM   #8
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f150nuffsaid,
I had the same issue with an 05 King Ranch. I had a K&N cold air intake when I bought her. I dislike K&N air filters. My take on them is if your letting more airflow in, more **** is going to get in too! Anyhow, I went by a local junkyard and picked up a stock air intake tube and air cleaner box for about $70. Cleaned it up and installed it with a regular air filter and the whistle is GONE GONE!

The whistle I had was drivers side, high pitched, and happened whether it was cold, hot, raining, etc. Happened from about 1500-2000 rpm. It was definitely the K&N CAI!
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Old 04-20-2015, 01:08 PM
 
 
 
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