1999 Mercury Mystique Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Mercury Mystique
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1999 Mercury Mystique ProblemsCheck Engine Light Due to Plugged EGR Passage
The Check Engine Light can illuminate with codes due to the lack of EGR (exhaust gas recirculation) flow caused. This is commonly a result of a clogged passage in the intake manifold. To correct this problem, the EGR valve has to be removed and the passage cleaned thoroughly. Partial restriction of this passage can cause smog test failures for the NOx emissions without causing a drivability symptom.
If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.
1999 Mercury Mystique Questionswhy is steering wheel hard to turn? (1 answer)
I have a 1999 Mercury mystique, it has a very hard to start if it starts it stalls if I am able to keep it running, there is no check engine light noted lights on in the dash, as soon as the thermostat starts to move the engine fan turns on feels like it stays open loop, and no check engine light...