Question about Mercedes-Benz 300-Class

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Need diagram of 84 Mercedes 300cd ignition switch. engine does not shut off when key is turned off.

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Sounds like a bad vaccum line at the key barrel... the old mercedes had vaccum accuated key barrels and with no vaccum the engine would stay running... check for the lines near the key hole and follow them and inspect as you go.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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My 1985 Mercedes 300D will not shut off after turning the ignition off and removing the key


vacuum leak.
You can start troubleshooting by finding the thin plastic tube that goes from the engine firewall into the inside of the car. Disconnect that on the engine side and plug it on the engine side with a golf t and tape. If this shuts the engine down with the key, there is a leak in one of your tubes inside of the car (door locks and trunk lock are all vacuum operated).

Jan 15, 2014 | 1985 Mercedes-Benz 300

1 Answer

Could a faulty coolant temp sensor make the glow plugs run all the time on a 1983 Mercedes 300CD?


No the glow plugs circuit is separate. They actually are on a timed delay shut off. Check the glow plug relay module behind the driver side headlamp assembly. If the light on the cluster is staying on all the time it's simply letting you know there is a fault in the glow plug circuit. Doesn't actually mean that the glow plugs are staying on all the time. You might just have a bad glow plug which is breaking the circuit therefor the glow plug light stays on. To check this use a test light and have someone turn on and off the ignition to see which plug doesn't light up.

Oct 11, 2010 | 1983 Mercedes-Benz 300-Class

1 Answer

Hey. 84 mercedes, My sunroof & driver side


I'm no expert, just a tinkerer, but I recently had the same problem with a couple of window switches and emergency flasher. I replaced the switches. It was cheap a easy. I got the switches from autohausAZ for about $30 each (local Benz dealer wanted $180, NAPA wanted $50 but were out). Carefully slip a thin but sturdy blade beneath the tab at one end of the switch (about 1/8inch) and then the same with the other--a bent spring clip holds the switch in. Once you've got the clips loose, the switch pulls right out.

Sep 24, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

84 dodge truck that when i let of the key switch it shuts it off


Change the ignition switch.That will solve the problem.

May 29, 2009 | 1999 Dodge Ram 2500 4WD

2 Answers

Car wont do anything when key is turned on.


magnetic pellet ,doesn't have one . Besides it's not a magnetic pellet . It would be a resistor pellet for the anti- theft system , which your vehicle does have . And it wouldn't be the ignition lock cylinder either if you can turn the key to the start position . Possibly the electrical part of the ignition switch . Viewing a wiring diagram for power flow and checking with a DVOM - digital volt ohm meter would be the proper way to diagnose .Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click electrical distribution ,then under subsystem click on power distribution . Click the search button then the blue links . The light's work because they have seperate power supply ,looking at first diagram you will see this . Thrid diagram down is ignition switch power feed . Top right of the page you will see the letter A , that gets B+ voltage from fusible link B . Finding the ignition switch under the dash on the bottom of the steering column an testing for B+ voltage on the red wire . If B+ voltage is there fusible link is good . Fusible link B is attached at the starter solenoid .B+ stud . If there is B+ power to the ignition switch check for power from the switch .Can you figure that out ? You should also check out some videos on youtube for basic automotive electrical testing .
Electric Testing Techniques You Need to Know

Oct 12, 2017 | Chevrolet Camaro Cars & Trucks

1 Answer

1990 mercedes 300D (diesel)will not shut off


change the switch in the top back of the injector pump ,it has one wire running to it and should be at the back of the pump where the fuel line goes into pump housing

Mar 14, 2009 | 1990 Mercedes-Benz 300 Diesel

1 Answer

Vacuum diagram of Mercedes 190D, 2,2


neto 190D: You are asking about a vacuum diaphragm?
I'm going to take a WAG.. Your engine won't shut
down with the key?
If so, he is the way you find out:
In your injection pump, the vacuum diaphragm which kills the engine is the one which has the fitting pointing parallel to the ground.
The vacuum line which serves it is a brown/blue
To check the system, first check for vacuum in the line. Run the engine for a minute or so. Cap off the brown/blue line.
Turn the ignition switch off and then with hose in hand, uncap it and you should hear a hissing sound. If you have a vacuum guage, obviously, use it for the test, you need a minimum of 10 inches to kill it.
To test the pump diaphragm, you can rig a vacuum line to a known vacuum source close to the main "T". Run the engine and with the line connected to the diaphragm, connect it to the good vacuum source, if it kill the engine, the diaphragm is good. If you have a hand vacuum pump it would be more ideal, because you could check the diaphragm for small leaks.
If the diaphragm is bad, it is easy to replace on the pump.
The shutoff diaphragm lists for $86.00
Is my shot in the dark correct?
Even though I am a Nissan Master tech, I also specialize in Mercedes-Benz and specifically Diesels, so if you need help, I'm here. I went through a few Mercedes Schools and have been swinging Iron in Mercedes since the 70's
I might be a little more informative than the public library.

Mar 05, 2009 | 1985 Mercedes-Benz 190

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