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What causes a fuel injector to start clicking in 1997 Mercury Mountaineer?

* Low fuel pressure. If the fuel pressure is too low, the injector will not be able to properly atomize the fuel, which can cause it to click.

* Clogged injector. If the injector is clogged, it will not be able to allow the right amount of fuel to flow through, which can cause it to click.

* Electrical issues. If the injector is not getting the correct electrical signal, it will not be able to open and close properly, which can cause it to click.

* Damaged injector. If the injector is damaged, it will not be able to function properly, which can cause it to click.