We may receive a commission on purchases made from links. The glow plugs in a diesel are like the spark plugs in a gasoline engine, but they function differently. The only similarities between glow ...

Diesel engines run on fuel that’s much thicker than gas, adding to the difficulty of cold-weather starts. To aid combustion, small electric heaters called glow plugs warm pre-combustion or combustion ...

The odds are pretty good that your car doesn’t have glow plugs. Spark plugs, probably, but glow plugs are pretty much for diesels only—they’re used to introduce heat to the combustion chamber in ...