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Matt
Matt, Engineer
Category: Mercedes
Satisfied Customers: 20601
Experience:  Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing
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I have a 1985 Mercedes-Benz 190E and it stalls sometimes and

Customer Question

I have a 1985 Mercedes-Benz 190E and it stalls sometimes and I have no power going, it starts for about 5 seconds the dies, if I get it in the right spot in the motor it will run for a couple of weeks or a couple months' but it always dies at some point.
When does die I start it the tech doesn't work, but when I get the sweet spot it does and the car runs fine. Any body ever have that problem? Say "Ok Google" WebShoppingNewsImagesVideosMoreSearch tools Facebook Twitter
Submitted: 1 year ago.
Category: Mercedes
Expert:  Matt replied 1 year ago.

Hello

this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine fuel distributor (should be 5 to 5.8bar) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

If this is OK then remove the rubber intake boot from the fuel distributor and then unscrew on the top of the unit find the central nut , pipe feed into the fuel distributor and push down on the aluminum plate under the rubber boot you should see the main fuel metering pin / needle rise up smoothly as you push down the plate, if its sticky or dirty then its possible this is getting stuck.

If this is OK then remove all the injectors but leave them connected to their fuel lines and put all into a clear container then turn the ignition on and (having replaced the central feed pipe nut) lift up the aluminum plate all the injectors should spray at once and look for ones that aren't spraying as much as the others - and replace or ultrasonically clean as required.

Expert:  Matt replied 1 year ago.

Hi

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