There is a very loun noises coming from inside the engine of my 2004 mitsubushi endeavor. i took it to a mechanic and was told the oil pump fail and it damages some of the metals cos the oil wasnt being circulated round. i replaced the oil pump with the damages metals but its still developing same problem.before this the idling of the car started dropping to about 300rpm and sometimes would go off causing the car to be jerking. there wasnt that initial power the car use to have. what could be the caus eof this problem

never heard of a Rattly Oil Pump.

The exterior drain is on the firewall behind the engine. It's tucked up about midway up the firewall hidden from view. It's a bit tough to get to, but there is a flange like piece of sheet metal that sticks out. If you really look you can see it if you are underneath the vehicle. It took me a while to find it when I owned this vehicle. If I still had the SUV i would post a picture, sorry.

Get a mechanics' stethoscope and see if you can find the source of the noise. If it is loudest when the scope end is on the oil pan, you have a rod bearing problem - which means that you need a new engine.

Check the oil pressure manually with a gauge. Make sure you have oil pressure. Perhaps you need a new oil pump, or new lifters. Get a professional opinion from a non interested party. Save money, get a diagnosis.

mean loosing power. check the coil(s). deffective coil or coils affect engine performance and loose its power. and engine has rough idles. and check TPS.

1st make a quick check, check fluid level on the pump,make sure the pump is not leaking fluid. check the belt make sure it has no cracks,make sure the belt is not slipping, it shoud not have any oil on it,should be tight. are the pulleys making noise,when the engine is running,does it make more noise when you try to turn. the belt could have stretched. if you jack the front end of your truck, turn engine on and turn power steering left and right with out any problem. if the pump is leaking very little, the lines could have air in them, and the leak would have to be eliminated before getting corrected. and there is the possibility of a bad pump. good luck!

I recently purchased a 2004 Ascender with the 4.2l in-line six cylinder motor, and under the 60 day warranty, the fan clutch and water pump had to be replaced. The mechanic told me that the fan clutch wears out causing an out-of-balance condition which puts extra strain on the water pump, which was leaking. Another issue may be that the timing chain needs to be looked at, because the tension wheel/gear for the chain wears out, making the timing chain sloppy. Then the chain flops around inside the housing, making a similar noise to the one you describe. Have your mechanic/technician check it out.

Your oil pump is shot, and possibly your engine. You need to get it towed to a mechanic before you do any more damage.

The oil pump is not getting oil into the top of the engine quick enough on start up

I have a similar problem with a Mazda

Got over it by adding a can of STP Oil treatment to the engine

That coats the surfaces better than the standard oils and cuts down on the noise and the wear factor

like ticking while idling try unplugging eletric fan clutch harness to see if it goes away if it does replace fan clutch and its called a viscuss clutch fan.