20 Most Recent 1998 Mercury Grand Marquis Questions & Answers


Yes, the balancer may be coming apart. Check the rubber between the two pieces to see if it has shifted. Also see if the belt is aligned with all the pulleys

1998 Mercury... | Answered on May 09, 2019


it could be a fuse....since a fuse is use just incase you get an overflow in current...and this prevents damage to gauges......

yeah check it first.....

1998 Mercury... | Answered on Feb 12, 2018


Yes replace your spark plugs first check your wires aswell

1998 Mercury... | Answered on Nov 26, 2017


Going to have to start by checking for fault codes.

1998 Mercury... | Answered on Oct 10, 2017


If you think the problem is the security system. This is for programming with no keys.
Use a scan tool to verify that the numkeys pid value is less than 8.
Use a scan tool to verify that the sparekey pid value is enable or yes.
Insert either the remaing key or a new cut key and turn to run.
Use the sacan tool to navigate to pats system and then choose security access. The scan will count to 10 minutes before the model will allow you in, once in, choose ignition key codes erase.
Did connect scan tool and turn key off. Inset key and turn to run for 3 seconds, then turn the key off and remove. Insert second second key and turn to run for three seconds, then turn key to off and remove.

1998 Mercury... | Answered on Apr 05, 2017


first suggestion is broken timing belt
second is failed crank shaft position sensor
third is failed cam shaft position sensor
forth is failed ignition control module
fifth is faulty ECM or power fuses to the ignition, ecm

1998 Mercury... | Answered on Mar 23, 2017


Some possibilities, battery--battery connections--generator--generator wiring-- too much parasitic drain with everything off.

Here is charging system diagram. I didn't look for mega fuse, I will if you want it. In the diagram, you can see applicable fuses and fusible links.
If battery is down get it charged up, can't do any testing if battery is down. With a charged battery, everything thing off, use digital multimeter across battery posts, the generic spec for a full charge is around 12.6 volts. Then start vehicle, take second reading across battery posts, the second reading should be higher than the first if charging system is working.
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1998 Mercury... | Answered on Oct 15, 2016


Some vehicles may require taking the steering column out, but start by taking covers under the dash off just about anything that you can visualize that has a screw, be sure to unhook the battery cables just so you don't set off anything,unhook airbags when you get to them,take some pictures if you have a phone it will help you to remember, but i would. Only. Take off what is needed to get the job done

1998 Mercury... | Answered on Nov 02, 2015


Inside the gas tank

1998 Mercury... | Answered on Sep 26, 2015


crank sensor needs tested and replaced

1998 Mercury... | Answered on Sep 02, 2015


Check cruise control cable under hood is tight enough to pull throttle arm.
Check brake pedal . see if wires to cruise control are still attached to switch on brake pedal.
Check magnets are still on drive shaft if rear wheel drive.
Check hall effect transducer is still in place to dedect magnets spinning on drive shaft.
Check Vacuum tubing is ok on cruise control it pulls the cable in and out .
Check if ignition sensing that wire is connected that senses ignition pulses ( front wheel Drive)
Check if a speed sender device is used on speedo cable to create pulse (front wheel drive ) sometimes used to sense speed on some cruise controls.
Check wiring around plugs and sockets under bonnet.

1998 Mercury... | Answered on May 27, 2015

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