2005 F-150 4 x 4 5.4L is making strange noise during ecceleration. doesn't seem to effect anything ... runs great so far. no engine lights on ... no loss of compression or power ... battery is holding charge ... sound seems to be coming from front drivers side behind tire ... no vibration, no shimmy, ...

drivers side
well it can be ignored
start with anything driven by the serp belt

a tensioner bearing or idler bearing is a probable cause of the noise

how do you see anything in that engine bay

Time for a new clutch jamie,you burnt it up,it happens.

OK. The noise you are hearing is the recirculation flap motor. It could be what is causing the condensation. Easy way to check in after the noise has stopped push the recirculation button on the AC controls to see if the noise happens. If the motor is bad and the flap isn't closing you could be getting moisture from the outside air. As far as the check engine light goes there is no relation. 2 completely different systems. The flap motor would probably run you a couple hundred of dollars. The check engine light could be anything.

Could be the serpentine belt rubbing on something, but is probably a bearing problem in the belt idler pulley. However, it could be the power steering pump, AC compressor clutch or generator. As the water pump is at the opposite end of the engine, it's probably not that.

start with don's post..
inner cv joints will make noise too. but not really popping as you said. more a click click....

Unusual to obtain exactly the same reading from each cylinder during a compression check, however good compression can be misleading when looking for problems.

To achieve it's potential, assuming an engine is in good order, the engine must be able to breathe efficiently and easily. Air and fuel must be able to get into the engine unimpeded and then leave without resistance. You mention a strange noise - might that be the noise of a strangled intake or perhaps a half-blocked exhaust, maybe the CAT is breaking up...

the defroster makes the ac compressur kick on

It sounds like you have a valve or rocker issue, I would run an engine cleaner through the engine. I suggest draining 1 quart of oil, pour in the cleaner and run engine for 5 min. Let engine cool and drain the oil. Pretty much another oil change. This will hopefully clean a sticking valve if this is the issue. But I also would check for anything hitting the pulley's or fans that may have came loose. I've seen this a lot. Good Luck. It may take 2 cleanings for the engine, so don't get disappointed.

could be a manifold leak....while the car is running youll hear air fluttering from the car

change the nock senser