Hi
I swapped the old engine with new stocked 17 year old engine, NEVER been used, NEVER tried on any car, bought from FORD dealer.
Upon starting the engine, there is rattling noise, especially after RBM change/raise, which seem to be VVT sprockets noise.
Engine Info: 4.6L 3V 8 cylinder SOHC 2006 FORD Explorer
What is the cause? and why?
Due to 17 year old storage, is it due to stuck sprockets lock spring? Solenoid? Actuators?
what to do?
Thank you
Well you never know they might just be worn out and that's one of the reasons you got that engine in the previous owner didn't like the noise and got rid of it. But if you're lucky it could be from sitting and there's a rust or corrosion or stuck valve somewhere in the system. In that case try a good engine oil flush all the directions on the bottle then change the oil and filter and pray the noise goes away otherwise you will have to take stuff apart
