Quote:
Originally Posted by Hersbird
My Cummins has one instead of glow plugs like many other diesels. IMO, i'm not sure it even needs it. I'm in Montana and even on the coldest days the thing could be sitting all night and it would fire in a few revolutions ignoring the preheat light with the modern high pressure common rail direct injection. Probably does help with cold emissions which might be why it is there still.
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Apart from the cold emissions issue, even though you may feel like it's redundant, it might lead to a quicker stabilizing of idle which is desirable for the sake of fuel-efficiency too.