I have a BMW 325xi 2001: Makes a loud rattling noise in engine. Sounds like some thing is loose. When I drove faster it sounded like a metal whirl with rattle. I took it to a mech. and was told may be a fallen rocker arm. Decided to take car home and it didn't make the noise. Drove around the block the a few days later and it was not making the noise until I hit a pot hole. Not a constant noise.
SOURCE: My Navigator makes a rattling noise at startup and
if rattling sounds like you have a bad pulley bearings on pulley going out pop hood and look at belt with running see if it is moving correctly not going in a back and forth motion like warped llook at pulleys see if they are displaced
SOURCE: oil consumption, rattle, engine noise
Check under the hood and inspect the valve cover gasket. If it's bad it would explain why you don't see any leaks on the ground because it's probably burning off on the manifold. This ticking you're hearing is a lack of lubrication to the rocker arms. Apart from the valve cover gasket, you should get under the car and inspect the oil pan and oil filter for seepage. Best of luck on your problem.
Greg
SOURCE: 2002 mustang makes rattling sound when accelerating...
Possible bad motor mount(s) --only thumps or rattles when power is going to the wheels.
SOURCE: Rattleing noise between 2500-3500 rpms 01 protege
Just took my car to the shop for the same appearent reason me also thinking it may be lifters. My mechanic said it spounds like a worn wrist pin ...... bad news for you if this is the case .......recomendations rebuild the engine or buy a new or remanufactured one. if the wrist pin lets go then you could throw a rod. If you must drive the car please be gentle
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