Re: [diesel_mercedes] Re: Glow plug function not restored

 

Glow plugs have a "regulating" element inside them along with the heating element. The regulating elements can draw enough of a current to look to a simple ohm meter like they are working. But hese glow plugs draw about 10 to 15 amps. Thats less than one ohm of resistance. So you can dangle a magnet on a string above the wires for each one and it should snap into alignment when first energized if they are drawing that much current. You can also use a high intensity light bulb, like the overhead dome lights in these cars, to test the plugs. Put the light in series with each plug and see if it glows brightly. Unplug the harness to the plugs at the timer relay first. Or you could just take each one out and energize it and see if it gets hot. Or, if it's easier for you, pull the injectors and cycle the plugs and look down the injector holes to see them glow. Hope this helps, Bogy. --- On Sun, 3/13/11, Lawrence Rhodes <primobassoon@sbcglobal.net> wrote: I get black smoke if I keep the throttle pedal down when starting.  A sure sign of unburned fuel.  I'm pretty sure the glow plugs are bad although they test good.  A test I didn't do was the voltage drop test at start up.  The battery should sag when the glow plugs engage.  If I just crank and crank with no throttle she will start to cough.  It's then when I can give a little throttle and she will start.  Lawrence Rhodes....

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