Question about 1997 Mercury Grand Marquis

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Grand Marquis 1997 turns off on slowing down

My car turns off when slowed down on a traffic signal or crossing bump or taking turns . Can't really understand what is happening . what should i change to overcome this problem ?

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Ck all the wiring in and around your front end

Posted on Sep 07, 2009

  • nuckle bustr Sep 07, 2009

    ck all the wiring in and around your front end

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1986 Mercury grand Marquis cutting out when slowing down nearly impossible to start. Oil changed, new air filter, new plugs and wires, new fuel filter...?


I had an experience with a 1984 T-Bird with a 302. The 1986 may have the same system. With that car there was a temperature sensor that affected the idle speed once the car was close to warming up.
With even later models there is a "cold start sequence" which is an electronic way of replacing the ancient choke. The "cold" feature set the fuel mix and the RPM and made starts easier. Now you did not say if the starting problem was when hot or cold or both.

The poor performance when slowing down can be related to the idle rpm being set too low once the thermal switch cuts out. What happens is someone tunes the engine for a rpm that may be correct for the car, but the thermal switch has not dropped the rpm yet. Then when the car really heats up, the idle drops even lower and when you take off your foot from the throttle, the throttle closes too much and the engine cuts out when you are slowing.

Put in a new thermostat. The idle settings can not be set until the thermal switches activate to a run position. Also you may have some vacuum lines crossed which are making the cold and hot cycles reverse. There should be a label with vacuum line routing shown stuck on a part that holds the radiator.

May 31, 2015 | Mercury Cars & Trucks

1 Answer

1987 grand marquis slows down going uphill, why?


A 1987 marquis is a heavy car ur 5.0 engine can only pull so much if the uphill is steep will it well cuz the car to slow down there is nothing wrong with that ..

Mar 20, 2013 | Mercury Grand Marquis Cars & Trucks

2 Answers

I have a humming noise when in park or slowing down at a light


Okay......on the OLDER ones there is a component at the rear of the engine,just down behind a coupla' inches................and they can even sound like a weak horn when they go bad. happens at idle or slow speeds.That might be it. don-ohio

Sep 13, 2011 | 2001 Mercury Grand Marquis

1 Answer

I am having trouble with my 1997 Grand Marquis turn signal-hazard flasher lights I am told I will need to repace the lighting control module at a cost of $750.00 does that sound right to you?


what exactly does your turn signal/flasher light do/not do?
going through a repair shop, I wouldnt doubt they would charge that much!
Good luck

Jan 21, 2011 | 1997 Mercury Grand Marquis

2 Answers

How can i minimize the fuel consumption of my jeep 2000 cherouki laredo 6 cylinders ?


There are several things you can do. Make sure the engine is in good tune, replace the air filter, Air the tires up to 34 pounds air pressure to lessen the rolling resistance, How you drive is most important. Take off from traffic light and stop signs slowly. accelerate steady, don't be in a hurry to reach cruising speed, unless, of course, you are merging with fast traffic. Anticipate stops. Start slowing down sooner when coming to a stop sign or traffic signal. Coast on the downhill streets, and use the cruise control as much as possible. Don't waste gas warming up your vehicle in cold weather. It will warm up quickly while you are driving. Any time spent idling is zero miles per gallon.

Dec 21, 2010 | 2000 Jeep Grand Cherokee

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Suzuki grand vitara vibrates when i step on brake.


check front brake rotors sounds like there warped..or it might be in your drive shafts check for looseness

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Heater blower motor blows normal then slows down 1999 grand marquis


There is a blower resister within the blower fan that is replacable. Most likely this is the problem

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1 Answer

Turn signals don't flash when braking 99 grand marquis


Check all earth wires on all lights.
most lights in cars run in series so if u loose one you loose the other mainly caused by bad earth on globe holders or corrosion where bulb sits.
little sand paper goes a long way.

Mar 07, 2009 | 1997 Mercury Grand Marquis

3 Answers

Turn signal don't work or the flashers?


If you still have flasher problems, I read on Google to spray WD-40 down in and around the hazzard flasher button, then press it up and down several times...and BINGO...all flashers and signals worked again....just had some dirt and dust in the wiring....

Jan 24, 2009 | 1997 Mercury Grand Marquis

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