I have a 2001 5.4 and I’ve been getting this strange sound I’ve replaced battery, Starter, Firewall solenoid, ignition switch but nothing seems to work I’ll attempt to upload a video of it any help is mighty appreciated Thank you

 

When exactly does this sound happen?

 

It’ll start maybe 5-10 minutes after truck is turned on sometimes within a matter of seconds of truck being started while is idling in park

 

Have you looked under the hood when this is happening? does the frequency change if you step on the gas at all?

 

Looked under the hood yes but I haven’t tried giving it gas and seeing if there’s a change I’ll have to give that a try