Makes a noise when reach 11mph - 2011 Ford Focus

If the car makes a lot of noise when the air conditioner is engaged there is most likely an issue with the compressor. If I can assist further, reach me at https://www.6ya.com/thericepatch

trans is in limp mode

Maybe catalytic converter shield more info is necessary. If rattling then c.c. plugged up

noise is a 100% HANDS ON, EYES, AND EARS ON JOB.
no net bunny , up here in the cloud can know.
but i do have advice.
open hood, and race engine by hand, in (neutral hand brank set)
and chock the wheels.
can you make it make noise now.

this one idea, makes finding noise 10x more easy, if possible.
finding moving noise is dangerous work, Ill not teach you that.

CHEAP TYRES RESONATE AT CERTAIN SPEEDS

your description is not clear. the throwout and pilot bearing only work when the pedal is depressed. and dont make knocking noises, so rule that out. If the noise is when the car is moving and in gear, the trans maybe bad. makes noise in all gears at 2200 rpm? trans needs to come apart.

simlest answer could be brake dust,...bearings would make the noise all the time,hence the question.noise would go about 10ft into drive...and possibly as soon as you touch brakes after pulling away...

sometimes when warming up motor the oil doesnt reach up there right away so eventually oil reaches causing clatter to stop a lot of vehicles do it even new ones just make sure you have the proper weight of oil in the motor if car has high mileage..this will help with noise

without seeing where you are taling about im guessing it to be noise from air going past the idle ait solenoid at the throttle body, since it will be open farther when cold. if that doesnt make sense, try explaining hte noise a little better. i really dont think its anything to worry abotu if it only does it when cold.

Sounds like a classic motor mount problem. Might want to get the dogbone strut checked as well.