Nickd683

My first time posting to the forum but I've visited many times. My question has to do with what i would call a plastic flapping or whirring noise coming from the passenger side of the engine compartment. It kind of reminded me of a playing card stuck in a bike wheel. I've read on here about different examples of sounds coming from that corner of the truck but all the ideas referred to 4wd trucks. So, my f-150 is 2wd 5.4liter with 101k miles and no check engine light. The truck runs great, cant complain, this noise doesn't seem to effect performance but would like to correct it. It happens on acceleration and gets louder the harder I accelerate. I dont hear it when idling or when in park or neutral and revving the engine.

redfishtd

I haven't heard about this exact problem Have you looked in that wheel well to see if some rubber or plastic has come lose . I have had sticks in there and a plastic bag .
My front rubber piece below my radiator came loose and I had to add quite a bit of aluminum ,washers etc to get it to stay .
Exhaust leaks are common on these manifolds as well as spark plugs coming loose because they were not torqued to 25-28 psi .

Nickd683

The sound increases with throttle under load not speed but i dont see anything loose are you talking about something hitting the fan while driving ?

BadFish523

Well if it increases with the throttle but not speed then it is not something rubbing on the wheel. Can you make a video, upload it to youtube, then post a link to it on here? Noises are really tough to both describe and diagnose by a description.