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.
Answers from Eric J. Olson, M.D. Walking pneumonia is an informal term for pneumonia that isn't severe enough to require bed rest or hospitalization. You may feel like you have a cold. The symptoms are generally so mild that you don't feel you need to stay home from work or school, so you are out walking around.