It's a 2000 BMW X5 4.4i , loud knocking noise coming from left side of engine, once starting it up and stays with that noise when pushing the gas and gets louder
The lifter rod is out or you cracked your piston mine did the very same
SOURCE: 1998 Ford Mondeo GLX, loud humming sound, front driver side.
Most likely it's a wheel bearing going out.., If you turn to the right, or the left when driving the noise will change pitch. Been there done that.....
SOURCE: 2003 BMW 325i will start but making noise
It might be a faulty power steering pump. Try checking the level of the power steering fluid. It is probably best you have your power steering system checked by a mechanic.
Does the noise occur only when the vehicle is moving?
Try moving the steering wheel from side to side, while stationary (but don't do it too often, or you might damage something). If the noise is still present when the car is stationary, then it probably is the power steering system.
If the noise only occurs while the vehicle is moving, it could be a problem with the differential/final drive, or even wheel bearings.
SOURCE: when i start my 1997 toyota rav 4 it makes a loud
without being there to listen to it then it is going to be hard to say what the problem is......but since my 20 plus yrs working on toyota and lexus and depending on the mileage and whether or not you have ever replaced the timing belt......i would first start by checking the timing belt because when the motor is cold the rubber on the belt gets hard and if the belt is streched when first started it will start flapping and will slap against the timing cover and as it warms up the rubber on the belt softens up and the noise will reduce to a less noticeable sound......i have also the wrist pin bushings and the pins themselves that are connected to the pistons make this noise and also if the oil rings are sticking it will leave the pistons loose in the cylinder wall and as the motor warms up the noise will go away.....i hope that this info will help and if you need anymore info let me know with more detail.....also if you could let me and fixya know if i was able to help you in any way and a comment and a thumbs up would be greatly appreciated....thanks and good luck.......have a blessed day...........
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