Question about 1998 Mercury Mystique

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1996 mercury mystique stalls when I stop a red light

It seems that when I am at a red light my car idles then it stalls. It started doing this since the weather has been warming up.

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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.

Posted on Apr 29, 2009

  • fbarbara27 Jul 31, 2011

    Thanks alot. Great article. Car is not stalling anymore!

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Have 1996 where is the part located at can't see it from the top is the thou dal valve on top or under car 1996 mastique

Posted on Jun 17, 2014

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FORD: 1995-96 CONTOUR, CROWN VICTORIA, ESCORT, TAURUS, THUNDERBIRD
1996 MUSTANG LINCOLN-MERCURY: 1995-96 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VIII, MYSTIQUE, SABLE, TOWN CAR, TRACER LIGHT TRUCK: 1995-96 AEROSTAR, BRONCO, ECONOLINE, F-150-350 SERIES, RANGER, WINDSTAR
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ACTION: Replace the IAC Valve with a revised IAC Valve if no Diagnostic Trouble Codes (DTCs) are present. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
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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...


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!

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