![]() ![]() As one glow plug going bad could be a sign that the others will shortly follow, some experts recommend replacing them all at the same time while others suggest keeping a close eye on the remaining glow plugs. There is some discussion about whether you should only replace the glow plugs that have gone bad, or if it is best to replace them all. #7.3 injector driver module feedback signal professional#If the light doesn’t light up, the glow plug is bad and should be replaced.Įasier is to use a professional glow plug tester device. Then disconnect the wires from each of your glow plugs and touch the probe of the test light to the terminal of the glow plug itself (not the wiring harness). To test your glow plugs, simply connect a 12-volt test light to the positive battery terminal. The easiest is to check your glow plugs before testing your glow plug control module. How can you test your glow plug control module?įirst things first, is it a problem with your glow plugs or your glow plug control module? Poor engine power – after a difficult start, bad glow plugs will make it difficult for your car to run properly, due to improper combustion which reduces power and efficiency. ![]() However, this can also be a symptom of a problem in the fuel system or battery.
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