Quote:
Originally Posted by gmaltz
I think I'm on the right track!
OK, I got the ol meter out and did a simple test. Removed the six prong connector to the GP relay and started checking the GP's through the wires using the ohm meter.
VIOLA
All checked out with no resistance except #3. It measured .9 ohms.
This must be the bad glow plug or wire.
Now the problem with the 603 engine is getting to the plug. Can't get my hands in there.
Anybody out there done this before without removing the intake manifold?  |
On my 240D w/ an OM 616, my 3 good plugs measured 0.3 each between the spot the wire comes into the plug, and the metal valve cover. The bad plug measured like 53.5.
If you're measuring from the wire on the relay plug to the valve cover, I could see it being 0.9 and being good. When you say there's "no resistance" between the other three, do you mean "0", or do you mean the meter couldn't give a value (infinite)? Either one isn't correct, since a glow plug is a resistive heater it should have at least a little bit of resistance. 0 ohms = internal short, it'll never glow...infinite ohms = internal break, it won't pass current.
Quote:
Originally Posted by siral3x
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That's where I came up with the original technique for testing, actually.