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Ohm out your glow plugs this will give you an indication if the UVC has come unplugged. Do this at the nine pin plug at the valve cover on the male side.
The pins will be arranged like this:
G - G - I - I - C - I - I - G - G
G = glow plug
I = Injector return
C = Injector common feed
You should measure 1 - 2 ohms between G and ground
You can also unplug one side at a time and see if one makes a difference. If so that is the side you need to look at that side.
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