1984 MERCURY GRAND MARQUIS CAR STALLS WHEN YOU STOP

  • Tiny
  • 2CarPros-Archives
  • 1984 Mercury Marquis
  • V8
  • 2WD
  • automatic
  • 85,000 miles

1984 Mercury Grand Marquis mileage: 85,000. My problem is the car stalls when you stop or slow down. Any suggestions would be helpful.

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Friday, November 19th, 2010 AT 6:01 PM

3 Replies

  • Tiny
  • 2CarPros-Archives
  • Member

If a major tune-up has not been done recently, this could be the cause of your problem. Replace the spark plugs, plug wires, fuel and air filters, etc. Also, replace the oxygen sensor. In addition, service the fuel injection system. Clean the carbon deposits from the throttle bore and idle passages

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Friday, November 19th, 2010 AT 6:07 PM
  • Tiny
  • rasmataz
  • Member

Could be a problem with the TCC solenoid, EGR valve, IACV, MAF and TPS sensors-

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Friday, November 19th, 2010 AT 6:12 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,286 posts

You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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Friday, November 19th, 2010 AT 6:45 PM

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