The only truly effective test for glow plug performance is a visual check:
Remove fuel lines and injectors (for re-installation, use a new heat-insulating gasket).
Using a wire hook or ballpoint pen, remove the heat shield from the injector hole on the cylinder head.
Lead contacts and glow plug wires remain twisted (affiliated).
Turn the ignition key to the pre-glow position.
Through holes in the cylinder head (arrow) observe which candles glow weakly or do not glow at all.
It is advisable to replace defective candles to be sure to replace the entire set.
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