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Matt
Matt, Engineer
Category: BMW
Satisfied Customers: 20602
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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I HAVE A 1993 BENZ, 400 E, ON A CLOUDY DAY ARE RAIN DAY..THE

Customer Question

HI.I HAVE A 1993 BENZ, 400 E, ON A CLOUDY DAY ARE RAIN DAY..THE CAR START UP OK,AFTER ABOUT 7-10 MIN. CAR START TO RUN ROUGH.AND SOMETIMES HARD TO START, CHANGE WIRES,DIST.CAPS, ROTOR BOTTONS,SPARKPLUGS,GAS FILTER,AIR FILTER,BUT ON A CLEAR DAY NO PROBLEM,,WHAT CAN I DO?.....THANKS WILLIE
Submitted: 11 months ago.
Category: BMW
Expert:  Matt replied 11 months ago.

Hello

This 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.

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Expert:  Matt replied 11 months ago.

Hi

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