Vehicle & Technical > Discovery

Testing Glow Plugs

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RichardM:
See my other post here in the thread about using Veg Oil http://forums.mud-club.com/viewtopic.php?t=46953&start=120
How do I test my glow plugs?  I assume that checking they are getting 12v when they should is not enough, do I have to check their resitance? If so what should it be?

hairyasswelder:
are they 12v? If they are, take them out and put power to them... The tip will glow. If anything but the tip glows it has a short and needs replacing

Steve

clbarclay:
Not sure what TDIs are like but on the VM its a pain to remove all the glow plugs so I just remove the connections to them and check resistance of each individal plug with a multimeter, which should only be a few ohms at most. If theres a lot of resistance or no resistance then its probably scrap.

andyb:
Disconnect the wire to all the glow plugs. Then with the igintion on use a length of wire to 'briefly' connect each glow plug in turn to the positive terminal of the battery. A short spark indicates that the glow plug is drawing current and should be working. You only need to then remove and replace (or further test) those that don't 'spark' :)

HTH

clbarclay:
The one trouble with that method is that it won't show up plugs that have either short circuited or like one of the plugs I've changed it was about twice the resistance so would still have sparked though didn't get as hot as it should have done.

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