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.
Where is the glow plug relay on a 6.6 Duramax?
Locate the glow plug controller to the driver side of the turbocharger near the firewall.
Do glow plugs have a relay?
The glow plug control unit uses a glow plug relay to switch the current for the glow plugs on and off. The more glow plugs monitored by a control unit, the higher the current the circuit will need. To reduce the current needed, glow plugs are often distributed across two circuits, with two glow plug relays.
Does a LB7 Duramax have glow plugs?
Be sure you are prepared by having new straps on hand when you are ready to replace your Duramax glow plugs. If you have a 2004 Duramax you will need to verify if it is an LB7 or LLY. If the eighth digit of the VIN is a “1” then you have an LB7 and these dual coil glow plugs will fit.
What causes glow plug relay failure?
Most Common Cause of Glow Plug Relay Failure Like most other car parts, the glow plug relay can wear out naturally over time. Exposure to extreme temperatures as well as fluctuating electrical currents and misfiring injectors can also play a part in accelerating the process.
How do you test a glow plug module LB7?
grab a test light unhook one of the leads to one of the glow plugs. hook one end of the test light to the lead and have some one turn the key one now with the key on touch the glow plug with the test light it should light the light.
How do I test my LB7 glow plugs?
take the rail off of them and get a test light, hook it to the pos side of the battery and touch the tip of each glowplug. if it lights up the glowplug is bad.
Is there a fuse for glow plugs?
The high current side of the glow plug system does not have a replaceable fuse from the factory. The stock system uses fusible links. Check for power at the battery side of the glow plug relay. If you have no power there you’ve got a blown fusible link.
Where are the glow plugs on a LB7 Duramax?
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What is glow plug relay?
Glow plugs relays are a part of the ignition system in diesel cars. When you turn the key in the ignition, the glow plug control unit analyses input from the ECU to determine the timings and currents required by the plugs in order to start the car.
