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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21860
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My car is c220 diesel 2003 reg starts very rough and then

Customer Question

Hi my car is c220 diesel 2003 reg starts very rough and then after 15 seconds stopes , help
Submitted: 1 year ago.
Category: Mercedes
Expert:  Matt replied 1 year ago.
HelloThis sounds like a lack of fuelIts worth checking that the electric pump that feeds the main fuel pump is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If the connections to this are corroded or damaged then the pump could stopat any time. 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 voltage at the pump and check its getting 12VAlso if its not injecting at all then check the connections to the crankshaft sensor, unplug it and check for corroded contacts and broken wiring, and consider fitting a newsensor - do the same for the cam position sensorIf the EGR valve is stuck open then this too can effect starting so try disconnecting it to see ifthis helps or changes anything Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.
Expert:  Matt replied 1 year ago.
Hi
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