Question about 1998 Mercury Mystique

2 Answers

Engine stall I have a 1998 mercury mystique and it is now stalling and sputtering when the car is idling. What could the problem be?

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  • virenaud Jun 25, 2008

    I didn't rate this yet. Just looking at this now. Will let you know when I look into what the problem is.

  • Anonymous Oct 18, 2008

    Same problem i am having ... cam sensor wiring harness is bad. It was recalled. Not sure if last owner had it fixed.

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2 Answers

Cam sensor wiring harnesses have gone bad in these cars. There was a recall.

Posted on Oct 18, 2008

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  • 121 Answers

The fuel injectors may need to be cleaned. Also the issue could be the fuel pump or fuel pressure regulator. You can test this by renting a fuel pressure guage from the auto store and hooking it up to the fuel rail on your engine. The port you hook it to is called a schrader valve and looks similar to a tire stem valve. If the pressure is low the problem could be either the fuel pressure regulator or the fuel pump. Good luck and if you found this solution helpful please rate it.

Thanks - Tech101

Posted on Jun 24, 2008

  • Justin Jun 24, 2008

    Can I ask why I was rated inappropriate? I feel my solution was very helpful. Can you please reconsider this rating?



    Thanks - Tech101

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1 Answer

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3 Answers

My 1998 mercury mystique shuts off when I put it into drive in the morning but when the engine get warm it doesn't turn off anymore...


On fuel injected vehicles, as opposed to those with carburetors, there is no idle-speed adjustment that holds the throttle blade open a little more or a little less. There is no "fast idle" cam operated by a choke — indeed, there is no choke.

Instead, there is a passage that allows air to go around the throttle blade. That passage has an electrically controlled valve that allows more or less air to go through the passage. In conjunction with a tachometer circuit in the Electronic Control Module, the ECM can completely control the idle speed of the engine, speeding it up as necessary when the air conditioner is turned on, if some electrical device is turned on increasing the load of the alternator, or a higher idle speed is needed due to putting the transmission into gear.

It sounds like that feature is the point of trouble. The air passage that is involved can become blocked, the electrical device can cease operating smoothly, etc.

The first thing to do is disassemble and clean that process. Make sure the air passage is clear, the valve is clean and operates, and so on.

Aug 05, 2010 | 1998 Mercury Mystique

2 Answers

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
'
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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1 Answer

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2 Answers

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I am a Ford tech (35 years) and this is the cause of the problem in about 90% of the cars I see with this problem.
Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 29, 2009 | 1998 Mercury Mystique

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