1990 Mercury Grand Marquis Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Mercury Grand Marquis

Repair Estimates

Never overpay. Check prices with our estimator

1990 Mercury Grand Marquis
$
547
to $
970
1990 Mercury Grand Marquis
$
312
to $
455
1990 Mercury Grand Marquis
$
87
to $
118
1990 Mercury Grand Marquis
$
218
to $
404
1990 Mercury Grand Marquis
$
1,000
to $
1,453

1990 Mercury Grand Marquis Problems

Throttle Position Sensors May Fail and Cause Engine Performance Problems

The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.

Problem With Idle Air Bypass Valve May Cause Engine Performance Problems

If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.

EVP Sensor Failure May Cause Drivability/Fuel Economy Issues

The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel economy can suffer, the Check Engine Light will commonly illuminate.

See More Problems (6)

1990 Mercury Grand Marquis Questions

Why does the horn get stuck on my 1988 Grand Marquis & how do I disconnect it ? (2 answers)

My 2004 mercury grand marquis has a emission leak it is not the gas what can it (1 answer)

how to pin point tranny problem (1 answer)

when i shift from 3rd to 4th(overdrive) tran slips like putting in neutral. i can start off in 4th but when i reach about 45mpg trans slips and i need to put back in 3rd. i have 89 merc grand marquis. ron56

See More Questions (34)

1990 Mercury Grand Marquis Recalls

Recall 90E043001
THREADED INFLATOR COMPONENTS MAY HAVE BEEN DAMAGED DURING ASSEMBLY WHICH MAY ALLOW COMPONENTS TO SEPARATE WHEN INFLATOR RECEIVES A SIGNAL TO DEPLOY THE AIR BAG.

See More Recalls (1)

1990 Mercury Grand Marquis Reviews

Hi i am 15 and this is my first car i paid $500.00 for it. it has a major gas and oil leak and had its tail pipe ripped off but, overall its a nice car. its got a 5.0 liter V8 in it. its extremly quiet for a V8 and with no tail pipe its still quiet. its also got ajustable air shocks. a mini air compresser kicks on when it runs. i think its for the shocks but it could also be for the vacume sys...
I REALLY DIDNT LIKE FORD OR MERCURY BUT THIS IS MY SECOND FORD PRODUCT AND IT RIDES SO SMOOTH IT LOOKS LIKE A LINCOLN RIDES LIKE A LINCOLN HAS ALL THE BELLS AND WHISLES.

See More Reviews (2)