There could be many many many causes for this as this is a very general question. Best thing to do would be to go get the code read at your local auto parts store. Now if your not able to repair it yourself you would be better off to take it to a mechanic and get the code read there
Check the engine end of the upper radiator hose
Have vehicle scanned to determine the problem
how to replace starter on 2000 mercury grand marquis
On a 1997 Mercury Grand Marquis : Check the Vehicle Emission Control Information ( VECI ) decal in the front of the engine compartment , for the type of spark plug used and the spark plug gap
The check engine light indicates that the computer has detected a "fault". Use a code scanner to find out what the computer has detected, that is PROBABLY the reason the engine is running poorly.
You can but the check engine light will remain on and it won't pass an emissions test.
The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions. If the check engine light is flashing a misfire has been detected
The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions. If the check engine light is flashing a misfire has been detected
under the hood, passenger side, between the engine and the fire wall. Look down.
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Check to insure that the engine coolant is full and the thermostat is not stuck. Without the heated fluid from the engine the heater will always blow cold air.