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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20615
Experience:  BEng hons Mech engineering, in auto industry 22 years
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BMW 320D.STARTS OK WHEN COLD AND RUNS OK.STARTING UP BECOMES

Customer Question

BMW 320D.STARTS OK WHEN COLD AND RUNS OK.STARTING UP BECOMES WORSE .THE WARMER IT BECOMES.JUST SERVICED RECENTLY,BUT NO DIFFERENT.I HAVE NOTICED A SLIGHT DIESEL LEAK ON NO2 INJECTOR,COULD THIS BE THE PROBLEM.
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.
Hello a slightly leaking injector can effect starting but not by huge amount, so its well worth rectifying the leak but if this doesn't help thenI'd check that you're getting full power to the glow-plugs, they pull a lot of current so take care when checking but see if the relay is clicking when the ignition is turned on first and also check the fuse if this is OK check to see if the engine earth strap is also OK.If the plugs haven't been changed in the last 20K then they may have to be replaced.You can test the glow-plugs with a multimeter by measuring the resistance across the plug ( between the power connection and the body) it should be around 4-8ohms if its tending to infinity / open circuit the plug is faulty or by using a clip on current clamp, either on the supply wire to glow plugs or onto engine earth, with glow plug light on you should see 15-20amps for each glow plug fitted, 4 cylinders would be approximately 60-80amps. Also its 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 stop at 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 12V

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