Vacuum check valves are usually located close to the vacuum source.
how to replace starter on 2000 mercury grand marquis
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
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
Check the engine end of the upper radiator hose
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
Have vehicle scanned to determine the problem
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check your brake lights if they not worhing replace fuse or brake light switch
I have a 1996 Grand Marquis. If one of the brake lights goes out the signal on that side flashes faster. I would check the brake/tail lamps.