Lifters can take time to pump up at first when starting....but worn main bearings can knock also
well it could bet a bent push rod or a lifter could be bad
well a couple things could be wrong depending on what year. if it is a hydraulic lifter then the oil pressure might not be high enough for the oil to reach the lifter causing a knock. another problem could be that your rod and main bearings could be worn out causing a knock and low oil pressure.
no
If it's just one or two windows it could be the motors ate sticking, take the door panel off, locate the motor, and jive it a good squirt of WD40, also any moving parts.
The Doctor has a sister that is a World Champion weight lifter.
could be a lifter sticking
If a Mercedes-Benz 380SL is experiencing jerking, it could be due to several issues, including problems with the fuel delivery system (such as a clogged fuel filter or failing fuel pump), ignition system malfunctions (like bad spark plugs or ignition coils), or transmission issues. Additionally, vacuum leaks or a malfunctioning throttle position sensor can also cause erratic behavior. It's best to diagnose the problem with a professional mechanic to pinpoint the exact cause.
A noisy valve lifter can be a sign of insufficient oil flow or low oil pressure, which may cause the lifter to not function properly. The noise often diminishes as the engine warms up and oil circulates more effectively, reducing friction and allowing the lifter to operate smoothly. However, if the noise persists or occurs frequently, it could indicate a more significant issue that may require professional inspection. Regular maintenance and using the correct oil viscosity can help prevent lifter noise.
The modulator valve is located on the LH side of the tranny and has a vacuum line going to. After replacing you have to set the modulator pressure by connecting a gauge to the tranny, removing the cover from the modulator valve and turning adjustment bar underneath. With out pictures its hard to show how the gauge is connected. To be quite honest if you really have done the tests required to diagnose the modulator than setting the pressure should be the easy. If you have more specific questions feel free to add answers and I will do my best to help. Sorry my answer could not be more complete.
Stuck hydraulic lifter.
Vacuum lifters are usually rented. To purchase a vacuum lifter, one could look for a manufacturer or ask a rental company if they can order one in to sell.
Why yes. Loss of compression in that cylinder that has noisy lifter.