How do I know if my glow plug module is bad?

What are the symptoms of a defective glow plug control module?

1. White exhaust smoke – a defective glow plug will cause diesel to leak into the exhaust where it burns.
2. Hard to start – this could mean the engine is slow to start in warm weather or fails to start in cold weather.

What happens when glow plugs don’t work?

If the glow plugs malfunction they will not provide the additional heat that aids in diesel combustion, which may cause the engine to experience misfires. The misfires may cause a loss in power, acceleration, and even fuel efficiency.

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.

What should I do if my glow plug is not working?

First, disconnect the wires from each of your glow plugs. Then, hook the clip of your 12 volt test light to the battery POSITIVE terminal. Touch the probe of your test light to the terminal of the glow plug itself (NOT the wiring harness!). Any glow plugs that does not light the test light is bad.

Why does my glow plug light up when I start the engine?

If the test light lights up, the plug is receiving power. Evaluate whether or not the relay is able to supply the power required to start the diesel engine by testing the ohms of the circuit with an ohmmeter. A working relay will produce between 50 and 120 ohms. If the circuit is producing less than 50 ohms, the relay is suspect.

Where is the glow plug controller on a Chevy K20?

Locate the glow plug controller under the dash, its a black box with about leave the blue wire intact and just take it off the terminal on the glow plug relay (so you Chevy K20 4X4 L Suburban w/R4 (CUCV clone project . wire for the card and the TM wiring diagram for its position is WRONG.

Is the glow plug relay on the negative side?

Beginning in , the L diesel utilized a combination glow plug relay and You can therefore test each individual glow plug wire or the supply for each. I have an 86 Chevy Diesel with a L engine. The negative side of the glow plug relay (distributor) will not engage.