20 Most Recent 1990 Mercury Grand Marquis Questions & Answers

All the common hand tools you can think of.

Ok first your tail lighs work of a fues with a test light you can buy cheap at dollar store test all the fuese on the fuese box 1 under the hood the other under the dash under the steering wheel or on the side of the dash board if all fuese r good at night with the lights on check if you have dash light on your instrument panel if no light you have a burn fuse also the tail light work of your headlight switch the only way to check if it's your switch is to remove it n bypass with one wire you'll have a big red wire the will be your 12 volts stick it on that the the other side stick it on the yellow or brown wire if your tail light work u have a bad headlight switch but don't touch any black wire those r growing you'll just burn the fuse those r easy to replace good luck hope I was helpful

Try several things... Fuel injector cleaner New fuel filters Check for vacuum leaks New spark plugs and wires

You will need to disable the air bag system and remove the Steering Wheel. This is not a job for a do it yourselfer.

In a 1990 model auto trans, Castrol recommend "TRANSMAX DOMESTIC MULTI-VEHICLE ATF". This is equivalent to Dexron II or III but not Dexron VI.

It should be in the fuse box

starter may be going bad sounds kinda like a loud metal on metal grinding noise.

underneath the hood of the car's engine compartment.

fuse box lower dash drivers side , lid ,cover should list fuse function

Bad ground

There is an ground problem some where

by taking the dash apart and installing a new one

You can get the lights from the trunk

Head light,sensor,etc?You solder it in place of the damaged one & heat shrink it