No, diesel engines don't have ignition coil as they work on compression ignition and not on spark ignition as in diesel engines. Glow plugs used in diesel are like small electric heaters which use the mechanism of heating due to resistance during electrification.
Walking pneumonia is generally treated with antibiotics. Mild infections are often not treated because they tend to clear on their own. With treatment, most people begin to feel better within a few days. Many over-the-counter medicines used for colds and flus may not help with complete relief of symptoms of walking pneumonia. It's important to talk with your doctor about any medicines you are taking or planning to take.
There is no simple answer. Pneumonia can be caused by chemicals, viruses and bacteria, by not breathing properly when bedridden, by immune system problems and other causes. The first thing you need to know is the cause of the person's pneumonia. When you know the cause, you can look at treatments. If a normally healthy young person has a pneumonia caused by a bacteria or germ, and if that germ is easily destroyed by ordinary antibiotics, recovery will take a few weeks.