Quote:
Originally Posted by W12487300D
I've got the same problem with my 87 300D. How do I check the ohm reading for each glow plug at the relay? I've found the relay and I have a good volt meter. . . While the intake manifold is off, is there anything that I should replace in addition to the glow plugs? Also, I see there are two filters for the intake manifold. Do I need both of them and how do I make sure they are OEM?
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1) Remove the large connector from the relay. Set your meter to read ohms. Put one lead to ground (intake manifold will work) and the other lead to one female pin at a time in the connector, check all 6. The readings should be all the same, and under 10 ohms each (remember, there's resistance in the wires, etc so you likely won't see the 0.6 ohms you'd get from a new plug tested on the bench.) Anything that's much higher is probably a bad plug.
2) While the manifold is off, replace all the injector line clips shown in the photo above. I'd also replace the 80A strip fuse in the glow plug relay. These get brittle over time and can fail at the most inconvenient moment. I keep a spare in the fuse box as well.
3) Filters? You mean gaskets? They don't have to be OE but all the OEM gaskets I've seen are plain paper, and the OE gaskets are metal reinforced. I prefer the OE (which you'd have to get from a dealership).
