A new warning light on your dashboard? You don’t understand why it doesn’t turn off… It’s typical, a vehicle is complicated and there are various factors why a light could occur. In cases where your glow plug light comes on while driving your Mercury Grand Marquis, it might point out several issues. On this page, we will do anything we can to help you see things more clearly. First, we will find out how the preheating light on your Mercury Grand Marquis works, and then the different causes it lights up when you are driving

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What is the goal of my Mercury Grand Marquis glow plug light?

The primary intent of the engine glow plug light, which is most of the time represented by a yellow coil, is to ensure that your glow plugs are working properly. In fact, it must light up when you switch on your Mercury Grand Marquis to tell you that they are heating the intake air in your cylinders and must go out after a few moments when the engine is running. This preheat light is therefore not meant to stay or come on while driving with your vehicle. However, if it turns on while driving, it may indicate several troubles, we will try to summarize the most important ones.

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

A glow light that comes on while driving on your Mercury Grand Marquis or at any other time other than when the engine is started is designed to notify you to a problem other than your spark plugs, we will check out this now. Whatever the case, plug in your car to the diagnostic tool will allow you to carefully translate the explanation for the light up of your glow light.

My Mercury Grand Marquis glow light comes on and I’m suffering from a loss of power

The first probability is that you perceive that your glow plug light comes on while driving your Mercury Grand Marquis and that you also knowledge a loss of power. In this instance, several trouble can explain its presence. Here is a list of the most important factors:

  • Problem of EGR valve, in reality, if you undergo a loss of power, it is possible that your EGR valve is blocked, in this instance, it is obvious that your preheat light comes on while driving on Mercury Grand Marquis because it is one of the failures of which it is meant to notify you. Have the status of your valve examined
  • Trouble associated with the turbo overflow valve, in this situation the ECU can no longer control the turbo intake pressure, which can bring about turbo boost and a disturbance in the operation of the turbo.
  • Trouble related to the injection, either an injector that has seized up or the injection pump that is malfunctioned by filings or other possible foreign bodies that disturb its proper performing.
  • Finally, the last problem that could lead to a glow indicator light on your Mercury Grand Marquis coupled with a loss of power, is that your fuel filter is too dirty, you should experience 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 Grand Marquis

To conclude, we’ll give you the causes for a glow plug light that comes on on your Mercury Grand Marquis without you feeling any difference in power or vehicle behaviour. Ordinarily, this is an electronic problem:

  • Glow plug relays or fuses to be changed, test and replace 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 get rid of the problem.
  • You have a false contact somewhere in your electrical circuit, test the other options first because it is not easy to find it alone, we advise you to go to your auto mechanic.
  • Faulty injection pressure sensor, ECU error

    • If you want more guides on the Mercury Grand Marquis, go to our Mercury Grand Marquis category.