Why does a diesel car shake at idle?
1 Answers
Here are the reasons for diesel engine idle shaking: Injector sticking: Sticking or poor atomization of the injector nozzle in one cylinder causes that cylinder to not work or work poorly (blue-white smoke will be emitted from the exhaust). This can be checked using the cylinder cut-off method. Uneven fuel supply from the injection pump: Uneven idle fuel supply from the injection pump leads to inconsistent operation of each cylinder at idle. Low RPM: Improper idle adjustment (RPM too low) can be resolved by adjusting the idle fuel supply screw. Incorrect clearance: Improper valve clearance (due to loose adjustment screws, abnormal wear, or worn valve pushrods) causes the cylinder to not work or work poorly. This can be fixed by adjusting the valve clearance. Poor valve sealing, leading to suboptimal operation. Engine overheating or low oil level (causing poor lubrication) makes mechanical parts difficult to operate.