Question about 1997 Mercury Mystique

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My 1997 Mercury Mystique dies frequently when stopping at intersections or slowing down to make turns. If sitting still and trying to idle the motor surges and will finally die. Driving without any stop and start seem to be OK.

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  • acroffoot Nov 08, 2008

    My 97 Mercury Mystique dont die but chugs when slowing down at intersections, stop lights, or turning

  • risksmart Jan 18, 2009

    My mother's car dies without warning after she has stopped. She goes to the store,parks, shops, comes out and the car won't start. She has had it towed twice in the past month. Each time they find nothing wrong and miraculously it starts again.

  • drlasher Mar 28, 2009

    1997 Mercury Mystique runs fine while driving. Once engine reaches normal operating temperature the car dies when idling in gear. With no load on the engine(Neutral) the car still idles low but doesn't die. I have found that turning on the A/C(full disclosure: the A/C doesn't work) fools the computer into idling higher so the engine doesn't die.

    I'm going to try first to clean the MAF sensor but I also want to try to read the trouble codes. I can't for the life of me find the ECC plug. Haynes says it should be behind the driver side strut by the firewall but I'm not seeing it. Could someone send a picture if possible?


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Check the AIS (idle speed motor) the bypass passage may be clogged with crankcase vent sludge. This is a problem I found many vehicles

Posted on Apr 04, 2009

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I have a 97 too, got it used and have had it for 6 years. Mine has over 120,000 miles on it. transmission has been replaced, now the alternator just went out. My car did this "cugging" and trying to stall for the longest time before the alternator went.
You should check all the hoses for sludge build up (especially if you let the gas get below 1/4 tank), then check the battery and altanator. These seemed to be the major problem with the car. Although now the electrical system in the car is going.
To make alternator repairs at a shop is just under $400.00 or you can do it yourself for parts and about 30mins of work for $170.00.
You can have the battery and alternator checked at Advanced auto parts or Discount auto parts for free.

Hope this helps! Other than that save your money and get out of that car!

Posted on Dec 16, 2008

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Have a 98 mystique 2.5 liter with the same problem. You have to change the throttle position sensor $40-$50. Fixed my problem instantly

Posted on Feb 23, 2011

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