Do I need to replace all 4 glow plugs if one is broken?

1 Answers
SanAlan
07/30/25 9:46am
Do I need to replace all 4 glow plugs if one is broken? The following is the relevant introduction of glow plugs: 1. The function of glow plugs: Glow plugs are used to preheat the intake air when the diesel engine is started at low temperature. Using glow plugs in winter can shorten the starting time, reduce the current consumption of the battery and reduce the wear of the diesel engine. 2. Cold engine power-on: When the engine is cold, power the glow plugs for 2 minutes, and touch the electrode of each glow plug with your hand. If the heating element of the glow plug is disconnected, the electrode will be cold. This method is simple and easy to implement, but the effect is slightly worse. 3. Single test: Test each glow plug individually, remove each glow plug, ground the outside of the glow plug, connect the live wire to the glow plug terminal F (use 12V power for vehicles with 24V batteries), and conduct a short-cycle test. If the glow plug becomes hot, it means it is intact.
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