Testing and Replacing Glow Plugs
The glow plug is one of the most important features of diesel engines. Almost like a first defense against the cold, glow plugs help your diesel engine start in the cold and prevent damage from freezing temperatures. Testing and replacing these little gadgets should be on every diesel owner’s winter prep checklist.
In a nutshell, slow starting, and complete failure to start. Once the vehicle does start, missing, rough idle, hesitation, and lots of white smoke until the engine warms. If you have a four-cylinder, one glow plug bad will cause a slight hard starting and a miss. Two will cause a very hard start and very rough operation. Three bad plugs make the vehicle almost impossible to start and keep running. The same applies to larger engines. If your vehicle starts OK if you plug in the block heater overnight, but will not start if you do not, then you probably have a glowplug issue unless your engine has very low compression.
Step by step test:
Step 9 walkthrough:
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