1991 Mercedes 190 starts but cuts out when driving
Have had the fuel pump relay replaced (Could this burn out in two weeks?)
It starts but then drives for 30 secs (or it could be ten minutes or twenty minutes) and cuts out when driving say 20 - 25 miles per hour.
When I try to restart it starts ok but the rev counter drops immediately and it cuts out. This can happen 15 times before the start will be maintained and then it can happen slowing for a traffic light five
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Re: 1991 Mercedes 190 starts but cuts out when driving
You could have a defective fuel pump, when they go bad they can draw enough current to fry the relay contacts, so I would suggest you test how many amps the fuel pump is drawing, I have fixed this very issue of repeated relay replacements, it was always the pump was shot.
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I WOULD CHECK FUEL PUMP RELAY IF FUEL PUMP KICKS ON AND OFF.BUT IF FUEL FILTER HAS NOT BEEN CHANGED.CHANGE THE FUEL FILTER THE FUSE/RELAY IF ALL IS GOOD I WOULD SCAN VECHICLE FIRST BEFORE BUYING FUEL PUMP.
It sounds like a fuel delivery issue. Mercedes recommends replacing the fuel filter every 60k. If it has been longer than thast since the filter change start there. Fuel pump relays are another common problem on this era. They are located behind the battery. Remove the plastic cover and you will se 2 black relays( yours may have a mass relay if it is a 90 model year, it will have a plastic knob on top that you turn to the left to unsecure it) IT will say kickdown on it the climate control is the other relay and it will say klima. Look for signs of corrosion on the solder pins. If your fuel pump(located at the right rear) is very noisy when it operates I wouild recommend replacing it. During this era of Benz about the only way to diagnose this would be to run a bunch of fuel pressure tests and to drive vehicle with a meter on the relay and on the pump to see if the relay cuts out or the pump cuts out. I always recommend to do both pump and relay because they can cause one another to fail. good luck.
Lift the hood. Just below the screen, opposite side from battery, you'll see a plastic cover shielding the engine management, abs control box etc. If you search around there after removing the shield/ cover you will find a relay with a fuse plugged into the top of it. This is the pump / system relay.
My car is a 1.8 - E 190 , 1993 model. The car is in a good condiction and done only 93,000 miles. It never gave me any problems up to now and for that reason I love it. The problem developed last week is that, it is difficult to start and when it starts sometimes it does not rev up and the engine cuts off. The ignition side is OK with new spark plugs, rotor arm and adistributer head. The hi-tension leads seems OK. I sort advise from people with Merc knowledge. There suggestion is perhaps it is the malfunctioning of the fuel pump relay. I have difficulty in locating this part. Can anyone please advice me how to overcome this problem and the location of the fuel pump relay. I am a professional Mecanical Engineer with reasonable knowledge in car mechanics.