A new light on your dashboard? You don’t figure out why it doesn’t turn off… It’s normal, a car is complex and there are multiple causes why a light may occur. In cases where your glow plug light comes on while driving your Mercury Mariner, it may show different problems. In this post, we will do anything we can to support you see things more clearly. First, we will see how the preheating light on your Mercury Mariner operates, and then the different explanations it lights up when you are driving

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What is the purpose of my Mercury Mariner glow plug light?

The main purpose of the engine glow plug light, which is in most cases represented by a yellow coil, is to assure that your glow plugs are working effectively. Indeed, it must light up when you switch on your Mercury Mariner to tell you that they are heating the intake air in your cylinders and must go out after a few minutes when the engine is running. This preheat light is therefore not expected to stay or come on while driving with your automobile. Nevertheless, if it comes on while driving, it may show different troubles, we will try to explain the main ones.

What to do if the glow plug light comes on while driving on my Mercury Mariner?

A glow light that comes on while driving on your Mercury Mariner or at any other time other than when the engine is started is meant to alert you to a problem other than your spark plugs, we will take a look at this now. No matter the reason, connecting your vehicle to the diagnostic tool will allow you to properly translate the motive for the light up of your glow light.

My Mercury Mariner glow light comes on and I’m having a loss of power

The first probability is that you notice that your glow plug light comes on while driving your Mercury Mariner and that you also encounter a loss of power. In this instance, different concerns can demonstrate its lightning. Here is a list of the main causes:

  • Trouble of EGR valve, indeed, if you go through a loss of power, it is possible that your EGR valve is clogged, in this instance, it is obvious that your preheat light comes on while driving on Mercury Mariner because it is one of the problem of which it is intended to warn you. Have the status of your valve looked at
  • Issue linked to the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can cause turbo boost and a perturbation in the operation of the turbo.
  • Issue in connection with the injection, either an injector that has seized up or the injection pump that is damaged by filings or other possible foreign bodies that disrupt its proper performance.
  • Finally, the last issue that could lead to a glow indicator light on your Mercury Mariner coupled with a loss of power, is that your fuel filter is too dirty, you should feel jerks because of a bad fuel flow in the engine.

My glow plug light comes on or is flashing but no difference on the performance of my Mercury Mariner

To finish , we’ll give you the explanations for a glow plug light that comes on on your Mercury Mariner without you feeling any difference in power or automobile behaviour. In most cases, this is an electronic problem:

  • Glow plug relays or fuses to be changed, test and change if necessary.
  • A contactor/potentiometer on one of your pedals (brake, accelerator or clutch) has failed, often a simple de-seizure will be enough to solve the issue.
  • You have a false contact somewhere in your electrical circuit, check the other solutions first because it is not easy to find it alone, we encourage you to go to your mechanic.
  • Faulty injection pressure sensor, ECU error

    • If you need more guides on the Mercury Mariner, go to our Mercury Mariner category.