Quote:
Originally Posted by P.E.Haiges
300TDT,
The GP light doesn't tell if the GP are working or not. Its mainly a timer. But if it blinks after starting, one or more of the GP are open (burned out).
If the GP test OK with the resistance test, they are probably OK. Did U check the fuse in the GP relay?
Do a search for cabin light and U will find out how to do a quick GP test.
P E H
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I second the suggestion about the fuse. My car is pretty much like yours in terms of the GP light, 300TDT. If the light comes on it starts up fine as if all plugs are working. If the light doesn't come on, it's a hard start as if none of them are working. Usually the light will come on if I wait a minute and try again, but yesterday I was having no luck with that and used another vehicle.
I tested the system later in the day yesterday (what do you know, it was working again when I tested it) and everything tests out good. Plugs at 8 ohms, voltage to the relay 12.6 volts, just like the battery, and all the pins giving more than 12 volts to each plug.
At this point I suspect the fuse has some tiny cracks that are, at times, preventing the electricity from getting to the plugs. I hope I'm right as that's the easiest fix.
As a side note, my car may know things that I don't know, because on my way home yesterday I was rear-ended by a Ford Expedition. The damage to the pickup I was driving seems to be very minor. If I was in the lower-sitting Mercedes, though, I might be on the phone yelling at insurance people right now. There was no damage to me, either, which is good.
Edit: By the way, 300TDT, if you don't know all the ins and outs of testing the GP system, check out diesel giant's tutorial on the subject:
http://www.dieselgiant.com/glowplugrepair.htm