20 Most Recent 1990 Mercury Grand Marquis Questions & Answers

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

1990 Mercury... | Answered on Oct 02, 2015

Try several things...

Fuel injector cleaner
New fuel filters
Check for vacuum leaks
New spark plugs and wires

1990 Mercury... | Answered on Jan 17, 2015

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

1990 Mercury... | Answered on Dec 12, 2014

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.

1990 Mercury... | Answered on Dec 07, 2014

It should be in the fuse box

1990 Mercury... | Answered on Nov 25, 2014

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

1990 Mercury... | Answered on Nov 02, 2014

underneath the hood of the car's engine compartment.

1990 Mercury... | Answered on Jul 24, 2014

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

1990 Mercury... | Answered on Jul 24, 2014

There is an ground problem some where

1990 Mercury... | Answered on Sep 05, 2013

by taking the dash apart and installing a new one

1990 Mercury... | Answered on Aug 15, 2013

Head light,sensor,etc?

You solder it in place of the damaged one & heat shrink it

1990 Mercury... | Answered on Feb 12, 2013

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