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
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Check the engine end of the upper radiator hose
Have vehicle scanned to determine the problem
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
You can but the check engine light will remain on and it won't pass an emissions test.
check the fuse
I have a 1998 ford grand Marquis- and the problem is the air suspension light stays on- how to fix this problem
under the hood, passenger side, between the engine and the fire wall. Look down.
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.
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.
First check spark, if you have, then check the fuel pump for pressure.
check the bottom of the steering column