Quote:
Originally Posted by MBeige
With the doors and windows closed you will still hear it faintly from inside the cabin, if you listen hard enough.
That said, I wouldn't put used glow plugs in my car.
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Why not? It's not a critical mechanical part and there is little risk. The worst that can happen is they burn out. I have been using used glow plugs for 20 years and run them till they burn up and put another used one in. It's rare that I bought 5 new glow plugs a few weeks ago (as an experiment to see how long new ones will last). If they burn up in less than a year I am going back to used plugs.
Edit: Forgot to mention when I pulled the old glow plugs, I checked each one again with an ohm meter and this time only 2 plugs are bad. I am certain I did not make a mistake the first time when I found 3 were open. I think it was just a case of an old intermittent glow plug.