Glow Plug Replacement Cost
If the glow plug relay, injector pump timing, and engine compression are not properly checked, then replacing the glow plugs may not address the original problem.
For best results and to avoid future problems, replace the glow plugs as a complete set. Be sure to verify that the glow plug relay is operating properly.
When the engine is cold, it will be hard, if not impossible, to start. However, the engine will start normally when it is warmed up.