Most likeyl cause could be a bad pulley
No
There are a number of causes for a rattling noise that occurs in a car. These include low oil and an engine that is faulty or going out.
Vanos
Many different things can cause a rattling noise in a Mazda tribute. Stark by checking the engine belts and all brackets for anything that could be loose and causing a rattle.
When you here a rattling noise from the engine at idle.
different parts inside the gearbox will have driped dry and make more noise after starting from cold this noise should go away fairly quickly as the running gears move the oil around the gear box
The rattling noise is in there so you can move the head around.
Perhaps heat shield on catalytic converter?
my car engine is on but with a loud knocking noise but when i apply some gas it does not move at all. my car is an automatic civic.
Can be a multitude of things. First see if its from inside the engine bay and occurs while in neutral reving the engine. From there check your headlight assembly.
Not really enough information given - however - if they are badly out of adjustment you might be referring to the sound of the valves tapping - OR - you are hearing the noise of pre-ignition - perhaps the timing of the engine is off badly.
depending on what engine size you have, you may not have to change the timing belt! i went through this delimma with my 04' 4runner. i have the 4.0 V6 Engine and it turns out this engine has a TIMING CHAIN and not a timing belt! my mechanic told me the chain does not need changing unless it is rattling or making noise. i consider this GREAT news and $1,000 richer! if you have the 4.7 liter engine, then you DO have a timing belt and I would recommend buying a timing belt kit from eBay or amazon.com. this will save you big $$ over getting it from the dealership or from your local mechanic. hope this helps. God Bless from Plano, TX depending on what engine size you have, you may not have to change the timing belt! i went through this delimma with my 04' 4runner. i have the 4.0 V6 Engine and it turns out this engine has a TIMING CHAIN and not a timing belt! my mechanic told me the chain does not need changing unless it is rattling or making noise. i consider this GREAT news and $1,000 richer! if you have the 4.7 liter engine, then you DO have a timing belt and I would recommend buying a timing belt kit from eBay or amazon.com. this will save you big $$ over getting it from the dealership or from your local mechanic. hope this helps. God Bless from Plano, TX