Sounds like your ignition timing is off.
A pebble.
Fan belt slipping
If it is a high pitch noise and the tractor does not start, your battery might be too weak. Check the water level in the battery.
If your tractor cannot start, check your safety switches.
You have to buy it before you start playing.
An acceleration noise from a BMW e46 engine could be caused by several things. Check the belts and pulleys to start with. Look over the engine for any spots that look like they are rubbing. Check for broken motor or transmission mounts.
I am having the same problem with my Ford Explorer 2011. When I accelerate to 60-65 I start smelling the smell. I have had my car in and out of service for the past year about this smell and they finally told me it is the carburator.
You did not define "squeaky" but if there is a shrill noise when you startup or accelerate under engine load then it could be your serpentine belts slipping. Take a look at the 3 belts and see if they are glazed (shiny). If so then it is best to replace them.
I have the same noise. It is very strange, because when I am stopped, the noise disappears, it appears when I start moving, but it does not increase as speed increases (that is what I would expect). It increases the frequency when I accelerate but only while moving. I suspect it could be related to the serpentine belt. or to the belt tensioner.JCT
I would say you either have a rod knocking or lifter knocking. I know in the 3.8 litre motors they are known to knock alittle when you cold start them. Most Grand Ams, Grand Prixs are like this. My sister has a 2002 Grand Am that does this and the noise goes away once it's warmed up. I would also double check and make sure your oil is full. get your car to a garage for a def solution.
start with the spark plugs
the most likely cause would be an improperly tensioned serpentine belt