Question'82 MBZ 300 D turbo.Uneven idling and black smoke at idling and at accelaration/starts up very well,lots of power/.260.000 miles.Also a winning/whistling/sound from somewere of under the car possibly from the rear at speed up to 30 mph,and over 55 mph...Please help !!!
AnswerUneven idling = possible bad rack dampener pin, fouled injectors.
Whining/whistling/sound from somewhere of under the rear of car = possible bad differential.
Suggest good used differential.
Black smoke at idle and acceleration = possible bad turbo seal, excess engine blow by from vent tube, bad injectors, injection pump over fueling (rebuild or replace).
Simple test:
Remove oil fill cap, start engine, describe smoke cloud from hole = little or none, small cloud, heavy puffing, massive black cloud.
For rack dampener pin:
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