What is a good glow plug reading?
The reading should be close to 12.5 Volts when the car is off and close to 13 Volts when the car is running. If this is not the case, check your battery or alternator before proceeding, since they may be the cause of the issue rather than the glow plugs.
How do I know if my glow plugs are bad?
Hard starting A hard starting engine is the most common indicator of damaged glow plugs. In cold conditions, without correctly functioning glow plugs, the combustion chamber may not reach the right temperature to ignite the fuel and start the engine.
How many volts do glow plugs need?
12V
Most glow plugs require 12V, though some use other voltages. Make sure the engine is cold, and the glow plugs are turned off. Disconnect the power cable from the glow plugs. If you don’t do this, your tester will be powering all the glow plugs instead of just one.
How do you diagnose a bad glow plug control module?
What are the symptoms of a defective glow plug control module?
- White exhaust smoke – a defective glow plug will cause diesel to leak into the exhaust where it burns.
- Hard to start – this could mean the engine is slow to start in warm weather or fails to start in cold weather.
How hard is it to change glow plugs in a 6.0 Powerstroke?
Glowplugs in the 6.0 have a very low failure rate. Only replace failed ones, otherwise it’s a waste of time & money. That being said, some are a bit tough to reach but not too bad. Be prepared to replace the harnesses as they usually break when you remove them from the plugs.
What are the symptoms of a p0678 glow plug circuit?
Symptoms 1 The engine management computer (PCM) will set the code P0678. 2 The engine will be hard to start or may not start at all in cold weather or when its been sitting… 3 Lack of power until the engine heats up sufficiently. 4 Engine may miss due to the colder than normal cylinder head temperature. 5 Engine may hesitate when accelerating.
What is the resistance of a glow plug?
Test the wire to the number one glow plug by placing the red lead on the buss bar number one wire and the black lead to the glow plug side. Again, .5 to 2.0 ohms with 2 ohms being the highest resistance.
How to check cylinder # 8 glow plug circuit?
Check the cylinder #8 glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms (verify the measurement for your application by referring to a factory service manual). If it is out of range replace the glow plug.
Is there a problem with the glow plug on my Duramax?
Often, you can verify the problem by wiggling the wires around the injector. If the problem goes away (even momentarily), you’ve identified the affected zone. Glow plug failure was a concern on the 2006 model year LBZ and LLY Duramax models, but the problem should have been long corrected for owners of these years.