Can universal joints not properly lubed cause grinding noise ?
Definitely yes! It will present initially as a chirping sound, but if let go too long, it will grind
SOURCE: how do i lube my ballbearing joints in my 94- isuzurodeo 4cil.
I think you mean 'ball-joints,' part of the steering and suspension.
Most modern vehicles, with some exceptions, no longer have the Zerk fittings once found on each ball-joint, but 'lifetime' lubrication packed into the joint and decently sealed to prevent loss of grease and incursion of dirt and moisture.
You may have sealed ball or roller bearings used in your wheels since the cone-type, adjustable bearings are also less common than they once were.
In my experience, these sealed assemblies have become ever more reliable as materials and manufacturing techniques have steadily improved.
Many such assemblies now really do last the usable life of our vehicles.
SOURCE: troubleshoot cause of noise
Its not a CV joint if your getting the noise in neutral.It would have to have something to do with the motor if your hearing it both in neutral & decelerating.Do you by some chance have an oil leak? Possiblly onto a clutch or timing belt?
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