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Originally Posted by engatwork
Glo plugs are tested by putting 12v accross them. If they light up they are good  . |
That would mean removal to see it glow. If you are going that far, why not just replace ALL of them instead of SOME of them? They all have the same wear and tear. In my car, if I had to redo glow plugs, I would have to pay for the removal of the intake manifold and the gasket. That would eat up any savings from not doing the remaining ones.