Car just started making a high pitch dentist drill noise from engine compartment.
Check the transmission oil level. That sometimes causes a whining sound.
Hope this helps.
I assume that you have a 6cyl engine, noise came from both worned secondary timing chain tenssioner shoes, just replace those two and while you have them all apart, also replace main tenssioner and guide, then all noises will go away. Good luck!
SOURCE: i have an 03 nissan altima engine makes loud clicking noise
1st check the the oil level and the vehicle's oil type.(owners manuel) 5w30-10w30
10w 30 is a thicker oil and could possibly be causing this.(Moves more freely through the engine heats the oil)
SOURCE: nissan altima 2005 noise from engine
i had the same issue had the alternator replaced and their is no longer a noise.
SOURCE: High pitched electronic/dentist drill sound when accelerating.
Probably the front differential, your probably hearing the famous differential gear whine. Change the oil, put Lucas for gears in it. You can get a hand operated oil pump to **** it out through the dip stick if it has one. Then fill it with the recommended amount.
SOURCE: high pitched squealing noise when i start engine
One of the belt should be loose or worn. Make sure they are not worn or cracking before tightening.
SOURCE: High Pitch Noise(fuel pump?)
Do you hear it for a second when you just turn key to on & not start?
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