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Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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I have a 1993 Mercedes 190E.

Resolved Question:

I have a 1993 Mercedes 190E. it does not want to start or when you driving and pressed the break it will shot off, on a hill it do the same thing
Submitted: 7 years ago.
Category: Mercedes
Expert:  Stan replied 7 years ago.
Did you mean the engine size as 2.6?
Could you tell me what are the engine rpm when cold and when warm?
How does it change as the engine warms up?
How does engine work while warming up?

Customer: replied 7 years ago.
Yes I mean 2.6 The engine rpm are turns on sometime with no problem and if you let it run for a while it shut down by himself or when you driving it and the engine go off. some people think it is the coil but i dont belive.
Expert:  Stan replied 7 years ago.

Unfortunately it is still unclear to me what exactly is happening to the engine. So i will help the best way i can with the info i have,

First of all the overvoltage protection relay (OVP) must be replaced/resoldered. Very often it causes voltage supply interruptions to the idle speed control valve and many control units. The relay is located behin the battery, in the control unit compartament. You will recognize it by the fuse in it's top lid. It might be located under a plastic cover in front of the engine bay fusebox. I need the VIN to tell exactly.


Another pssibility to check, is the fuel pump relay. Due to cold solder problems inside of it, it interrupts the voltage supply to the fuel pump. It is located near the OVP relay, either in control unit compartment behind the battery, or in front of the fusebox.

It's fault is confirmed if you listen to the fuel pump when you are having problems- it will swithch off during engine running by itself.





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