Testing glow plugs

Submitted: Sunday, Jun 04, 2006 at 09:24
ThreadID: 34595 Views:9462 Replies:3 FollowUps:3
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Hi, I suspect several of my glow plugs are faulty (1HZ). I have checked power to them (no problem there), anyone know the easiest way to check the plugs individual operation? Cheers Mudness
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Reply By: Barnray - Sunday, Jun 04, 2006 at 10:31

Sunday, Jun 04, 2006 at 10:31
Disconnect the busbar from the plugs and use a test light from the Positive on the battery to the terminal will check for continuity. no light = no glow. Barnray
AnswerID: 176623

Reply By: bmwrider - Sunday, Jun 04, 2006 at 17:27

Sunday, Jun 04, 2006 at 17:27
If you have an Ohmmeter on your Multimeter, positive lead to the glow plug end and negative lead to earth (engine block) and check the readings. The good plugs will read something like 5 k ohms (whatever the specs say). The crook ones will be open circuit (infinity ohms). Some may be below spec (very low ohms).

Garry
AnswerID: 176666

Follow Up By: V8 Troopie - Monday, Jun 05, 2006 at 00:30

Monday, Jun 05, 2006 at 00:30
5K ohms across 12V is not going to do much heating, is it? (0.03 Watt!) Maybe you meant 5 Ohms? Though I would suggest 1 Ohm is closer to the mark.
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Follow Up By: HJ60-2H - Monday, Jun 05, 2006 at 09:16

Monday, Jun 05, 2006 at 09:16
Yep, on my Cruiser the resistance across a good glow plug is 0.7 Ohm. Can make it hard to see if they are good or not when using a cheap Ohm meter.
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Follow Up By: bmwrider - Monday, Jun 05, 2006 at 11:31

Monday, Jun 05, 2006 at 11:31
I stand corrected (I knew someone would - lol) It's been a few years since I had to check some on a Jeep Diesel and I couldn't remember the specifications. As HJ60-2H says it is hard to see the differences, but an open circuit glow plug is clear. Glow plugs can be sourced fairly cheaply (if you do some checking around). If they have been inservice for some time, it might pay to replace them all and keep the best ones for spares.

Garry
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Reply By: gqpat - Sunday, Jun 04, 2006 at 19:55

Sunday, Jun 04, 2006 at 19:55
Disconnect busbar and quickly flash 12v across each plug if it _Affordable_Storage_Drawers.aspx current their ok dont hold the power on as some glow plugs will burn out real quick
AnswerID: 176691

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