Glow Plug Issue Mercedes 240d 1974 - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 04-24-2012, 06:48 PM Thread Starter
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Glow Plug Issue Mercedes 240d 1974

I replaced the glow plugs on my 240d as it was not starting. New plugs are in, everything is connected, but it seems that only the first plug is working. All 4 plugs test well.

My glow plugs use the old fashioned metal wire to connect from plug to plug. Is it possible that wire is no longer carrying a charge to the other plugs?

Please help.
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post #2 of 4 (permalink) Old 04-24-2012, 06:49 PM Thread Starter
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When I pull the manual switch the salt shaker display heats up VERY quickly within ten seconds. It seems like only the first plug is working but I know all 4 are good.
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post #3 of 4 (permalink) Old 04-25-2012, 05:41 AM
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By "first plug" are you referring to cylinder #1 or the first plug in the power circuit (actually cylinder #4)? If you mean #4 then check the wire loop between #3 and #4. It is easy to have this wire upside down which will make contact to ground completing the circuit on only the #4 glow plug. It only grounds when the accelerator linkage is pressed down so it's easy to install incorrectly since you don't notice it with the linkage at rest.
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post #4 of 4 (permalink) Old 04-25-2012, 11:21 PM Thread Starter
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Problem solved for the moment. I put in a new glow plug system that fires each one independently instead of in sequence. It starts with two and I will get two more tomorrow.
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