Mechanics

MERCEDES BENZ 400E FUEL PUMP PROBLEM

1994 Mercedes Benz 400e

1994 400E wont start, battery is good and was running good than next time went to start engine wont spark enough to start

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Averageanna
January 6, 2011.



Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

Rasmataz
Mar 14, 2011.