Truck starts to squeal at 100km/h
 

Why does my truck start to squeal when i start going over 100km/h? Its coming from the passenger front dash area. I have checked everything, nothing is loose. Could it be the computer? I know its right on the firewall under the hood there. What would cause this noise? anyone know? anyone have this happen to them? I had a 93 nissan 1/4ton that did this too! Why?

Also another problem my truck has, is if I dont let it warm up a good five minutes, it will bog bad on the highway and not do over 50, if i try to put it down, it just chugs? What would cause this? If my truck is warmed up, it runs great, no chugging ever. Its a 06 f 150 5.4 fx4 with 170000kms on it. I live on a acreage right off the highway, I always let my truck warm up, but sometimes I leave too soon before it was warm enough I guess, and it kinda sucks going straight to the highway and only getting up to 50kmh with a car behind me doing 100! not too safe! Then when i get over 100, truck starts squeeling! lol

would this cause the squeal too? found this thread https://www.f150forum.com/f4/bog-dow...166431/index2/ anyone have pictures of what foam they are talking about? Mine only bogs on a cold engine though? Within the last ten thousand kms i have replaced the air filter, cleaned the throttle body, maf sensor, and replaced a cam sensor.

This is a "shot" at it, but what's the condition of the rubber ends of the windshield cowls, especially at the passenger side? Mine were dry rotted, and crumbled. I replaced them a few months ago (link here somewhere on a guy that sells them), and an annoying whistle I used to have at highway speeds went away.

mine are in pretty good shape, I will take them off and see what happens. Truck is always parked under a canopy or in garage. My flares havent faded yet lol. I think its something mechanical to due with the truck, because the nissan I had did the exact same thing, go around 100kmh and produced this god awful sound. And both trucks started doing this when I put them to the floor! I was down a straight stretch and just recently changed the plugs on my truck, and decided to put it down on a straight stretch, then around 150kmh this loud squeal started. and ever since then it makes the noise at around 100kmh. The nissan I was going up a steep hill and put it down when the noise first came.

Possibly alternator screaming if it's doing it at high RPM/rev change.

nothing to do with revs, thanks though.