stein78

I'd say your video is more in line with what mine sounds like when it makes the noise. Does yours do this all the time? Mine does not. Just randomly when the engine isn't up to operating temp. More often than not, it doesn't make the noise.

PARay5.0

This is about the volume and type of sound it has most of the time when I hear it. It does once in a while get louder though. Like tonight for instance, got home from work didn't hear it. Ran down to the store and back and it was making it ever so slightly. Truck runs great, plenty of power, and I'm averaging like 18mpg. I did just add about a quart of Motorcraft Pre-Diluted Orange Coolant to get back in the cold fill range over the weekend. I believe it may have been low when I bought it though.

papa tiger

Watch the coolant level closely. If the head gasket leaks steam knock can get very loud.

REFINE

Mine is just the opposite of yours. It makes the noise more often than not.

bluefox_gt

On the first one sounds more like a leaking/cracked manifold. Ive have several in the last year 5.0 and 6.2. The noise went away when up to temp. that last one sounds like internal Engine to me. Better get that checked

REFINE

Ugh...not what I wanted to hear. Thank you for the advice.

chef-j

Mine does same but not that loud.

MEZERR

It's not a manifold leak. The sound for a manifold leak is different. It's a high pitched tick, most times with a faster cycle time, and generally goes away after 5-10-20 seconds etc. Sounds like this:

MEZERR

This noise sounds like valve or hydrolic lifter issue.

I want to say stuck lifter, or slightly collapsed hydrolic lifter, but not sure if these engines even have hydrolic lifters anymore.

This noise doesn't sound like a lower engine noise, but an upper valvetrain noise. Fairly common IMO

PARay5.0

Had a chance to get some video after work. This is at low and happens cold and warm.

From Driver Side:


From Passenger Side:


What do you think?