Hey Tim , whether an engine "knocks" or "ticks" is a BIG difference!! Valves usually tick. Rods and bearings knock,,, I would consult a qualified professional and get their opinion..make sure you have PLENTY of oil...
SOURCE: Ticking noise
I believe it is called piston slap
read all about it here http://www.pistonslap.com/whatisit.htm
SOURCE: Loud ticking noise on startup
I would have you oil pressure checked. The oil pump or bearings could be going out. The lifter noise on this car usually will go away faster then 5 minutes. I think the noise is lasting a little to long.
SOURCE: Loud Knocking when pressing on gas pedal
What you are describing sounds like you have an engine bearing failing. Do not drive it 'till you have it diagnosed and repaired (most times though it's too late when you hear it.)..... Outside chance it could be the trans flex plate but I doubt it.
SOURCE: when i start my truck
The sound you are hearing is an exhaust leak. Sounds like a ticking noise, goes away when driving, but can be heard when sitting. You probably have a bad manifold gasket, or loose clamp or broken weld on exhaust. Best way to tell is start it up and listen as to find leak. Or take to a muffler shop and have them repair it.
SOURCE: Loud Ticking sound 2004 F150
Check the Alternator / Powersteering belts .
One of them will be damaged and loose.
Hope this helps.
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