One of the most common causes of hard starting diesel engines, especially in cold weather, is a failed glow plug system. Glow plugs help provide the initial heat necessary for combustion during cold starts and engines with failed glow plugs can often be very hard to start and can exhibit smoky exhaust and poor running after start up. GarageMatch connects you with trusted repair shops where you can get your glow plugs and timer replaced by a qualified mechanic via our service request submission process.