Stalling 300E
This happened twice today, once on the way to work, once coming home. Slowing down from about 50 mph to make a left turn, the engine stalled. No warning, it just quit. Restarted easily and ran fine for the rest of the drive.
Here's what I've replaced in the last 14 months and 16,000 miles: Head gasket, O2 sensor, all new copper fuses, voltage regulator, plugs, wires, cap and rotor, fuel injectors and seals, fuel filter and accumulator, OVP relay. The car is my daily driver and has always run great with a normal idle speed and it starts better than when I got it. It now has 152,000 miles. Any ideas what I should check? Edit: I just pulled codes from the diagnostic plug and the only one I got was for the air injection system. I unplugged the air pump about a year ago because it was noisy when cold but it's never thrown a code before and I thought it was only for emissions anyway. |
This happened to me on the '89... dying fuel pump relay. Which for you should be the MAS relay like my '90.
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I once had an 83 380sel that would stall while running - no other symptoms. It would restart easily and I couldn't figure it out. I checked fuel, battery ground and probably some other things I can't remember. It finally died on the interstate and wouldn't restart. Turned out that the coil died.
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Check the fuel cap, on the tank .If its has a faulty seal, its loosing pressure. And as post above from brooktre .Earth points must make a good contact to the body .
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Depending on the year model, the MAS relay *IS* the fuel pump relay. You haven't told us what year your car is.
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Sorry, it's a 1991, and to respond to what someone said, the coil has been replaced.
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If so - my vote is for the road speed sensor |
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The tank has a vent to prevent building pressure and has a valve to prevent vacuum. You can remove the cap and drive around all day and have no impact on how the car runs or drives. On a newer car, you can set a check engine light if the purge valve checks for vacuum at the cap (most cars run very slight vacuum to prevent fumes escaping), but this has absolutely no effect on how the engine runs. All fuel pressure is created by the fuel pump. It doesn't push air in the tank to do this. Not sure where you're getting your information, but I'd check the reliability of your source. |
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Additionally, is the OVP you installed used, or is it brand new? If it's a used one, I'd suggest replacing it with a new one. When they get flaky, they can be maddeningly difficult to troubleshoot. If you're handy with a soldering iron, it may be well worth your time to take the cover off the MAS relay and look for broken solder joints on the pins of the circuit card and the pins of the relays. |
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how to remove the MAS CONTROL RELAY mercedes w124 ?? It looks simple but I am unable to get it pulled.
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