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check for fuel rail check for spark you can hear the pump run when key is turned if know sound is heard check fuse,relay,pump. get spark roll over check for spark if no spark pull out mod take to autozone to have tested if good replace crank sensor
i ran into the similar problem it turned out to be the water pump the impeller behind the water pump had come lose and was not forcing the water to rotate the system.
You don't have to replace it but you have to take the belt off to remove the water pump for the extra $30.00 i would recomend changing the belt too, unless the belt has been changed less then 20,000 miles ago .
Hello, jeruel_javil and thank you for asking your question on Fixya!
Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 1998 Mercury Mystique,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation. How to diagnose your overheating 1998 Mercury Mystique
For the 1999 Mercury Mystique Water Pump Belt on 2.5L V6 Engine:
Probable Causes: Belt: worn out, started slipping. Overheating caused by failure of Belt. Lost antifreeze: caused by failure of belt, not turning Water Pump Pulley, not circulating anitfreeze, which resulted in overheating.
I i were you i would check the ignition. it sounds like you are only connecting some of the time. And yes it is very normal to hear the fuel pump kick on when you turn the key to the on position.
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