Why my mercury mystique keep dying i have to keep pushing the gas so would keep going it dye every time at the stop sing
The idle is controlled by the engine computer through the idle air control valve. This valve will be mounted on the throttle body assembly-where the big air boot from air filter attaches. This valve can get deposits built up, restricting idle air flow to the engine. Take it off and clean it, and the air passages it sits over. Be looking also for a vacuum or air leak. Check the ends of the vacuum hoses for splitting or cracks that leak.
SOURCE: 1996 mercury mystique
Check for vacuum leaks.You can spray starting fluid around all parts of the intake.Observe idle as you do.If there is a leak the engine rpm will race higher.Also listen for hissing noise.Is the check engine light on?..If so what codes are stored..Good Luck!!!
SOURCE: My 1997 Mercury Mystique dies
Check the AIS (idle speed motor) the bypass passage may be clogged with crankcase vent sludge. This is a problem I found many vehicles
SOURCE: i have a 95 mercury mystique and it starts but but
THE ENGINES THROTTLE BODY HAS A TPS WICH IS CALLED A THROTTLE POSITIONING SENSOR
It has a built in reostat inside of it which can get a flat spot anywhere in its circuit explaining why your car hesitates or sounds like it is ready to stall out
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I would replace it and have the voltage set at 1.5 volts when set at the idle position
Then it should run fine again
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