1990 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mercury Grand Marquis
- Throttle Position Sensors May Fail and Cause Engine Performance Problems
- EVP Sensor Failure May Cause Drivability/Fuel Economy Issues
- Problem With Idle Air Bypass Valve May Cause Engine Performance Problems
- Wear on rear axle shafts may cause excessive play and gear oil leaks
- Battery Light Due to Damaged Alternator Wire Harness Connector
- My 2004 mercury grand marquis has a emission leak it is not the gas what can it
- how to pin point tranny problem
- I have a 88 Merc Grand Marquis and normally it runs good but lately it has been
- Have 1986 Grand Marquis and needs tranmission. Can an newer year trans fit it?
- 1990 Marquis acts like dead battery.Replaced batt & solenoid. No change
1990 Mercury Grand Marquis 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.
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.
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.
1990 Mercury Grand Marquis Questions
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
Tried disconnecting battery & it still wouldn't shut off
1990 Mercury Grand Marquis Recalls
1990 Mercury Grand Marquis Reviews
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.
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...