Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi George, can you give me a little more history of the problem? Has the car been running fine and just quit? Do you have a voltmeter?
Ok, can you verify that the fuel pumps are running by listening to them at the right rear of the car while a helper cranks the motor? You may need to actually put your hand on the pumps to feel them working. Do you have that voltmeter?
Ok, spark comes from the coil and goes to the distributor and on to the ignition rotor back out through the cap to the individual spark plugs. If you have weak spark from the coil to the cap the problem could be a bad coil, coil wire or ignition control module. You will need a voltmeter to perform some tests or you will have to have the car diagnosed by a Mercedes technician familiar with the ignition system. I don't recommend replacing anything without proper diagnosis. Let me know if you have any questions.
The first thing I'd like you to do is to turn the key on and test for voltage at each terminal of the ignition coil. Then I'd like you to connect your voltmeter from one terminal to the other and measure the voltage. Let me know what you find.
Ok, if he is correct then the procedure would be to replace the coil wire and then the coil. If he is incorrect I would check the spark at the spark plugs. If no spark is present I would replace the ignition rotor and possibly the distributor cap. I would see if you have spark at the plugs first. Let me know if you have any questions.
Ok George, I'll be around if you need anything.
Hi George, if you have some spark from the coil I would change the rotor first. Let me know what happens.
Ok, at least we know the problem is lack of fuel and not spark. I doubt that the fuel filter could be the problem based on your description earlier but you could give it a try. To diagnose it properly the fuel pressure and flow should be checked. Also make sure the car isn't out of gas. You may have a problem with low fuel pressure or with the fuel distributor. I'm assuming that when he stops spraying the ether that you can't keep the car running.