I own 1992 grand marquis. Time after time my engine performance is getting lower and the car fuel consumption gets up.. i cant keep up with speed even if i put my foot on pedal badly... i change fuel.. change TPS, change air cleaner and spark plugs.. cleaned the MAF with a cleaner but my performance remains the same :(

The car began to make a whining noise when I accelerate, no noticeable noise when coasting in gear, and a winding down noise when I apply the brakes. After about a week of virtually no driving I had to drive 13 miles, sounded like something broke or fell off under car, some rattling noises, then began making clunking noise and felt jerky/locking up. No visual broken parts under car. Could it be the rear differential? What might be the most likely culprit, the place to begin my process of elimination?

I have done everything under the sun but still get only warm. Thinking or going to change control valve to get more heat. The A/C condenser is white cold. I know it's to be cold but so cold it is frosted over?

flushed heater core seems to flow normal. Cannot get warm air at any time, unless drive 50 miles. then get a little heat "HELP"

After installing the lock and cylinder can not get the key into the lock position.

wondering where I can find a diagram pictures instructions of door latch assembly, how to install, it is also hooked up to keypad entry

can get tank off

Hi please can you assist me with the cylinder head torque specs for a lincoln mercury grand marquis ls thanks

a tried to change from floor to defrost. airflow still will not change

Just want more HP

When I called the auto parts store there were several types of sensors for this year/make/model available. How do I know which one to replace? This car only has 90,000 miles on it and is in imaculate condition. I cannot afford to play process of elimination.