Started my lincoln mark viii 1995 this morning everything was fine, stopped at store tried to restart car turned ignition key, my hand slipped on the key so the car did not start all the way went to turn key again engine turns but will not catch could it be a fuse or did the computer become jammed some way?

Are you getting spark to the plugs and normal fuel pressure ?

I am trying to find where the heater valve is located on a 1996 Lincoln Mark VIII; I found only one place where it said it was under the dashboard, but I am trying to find more exact information.
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Truck & Heavy Duty Diagnostic tool

If the car jump starts, the coil is fine. Sounds like your battery is not charging. If you have a voltmeter, check voltage at bettery with engine running. Should be 14-15 volts. If you don't have a voltmeter, take the alternator to the parts store to be checked.

go out and sit in your car with the door open turn on the ignition key and when you turn it on you should hear the fuel pump prime in the gas tank, if you hear it prime up then its something else. If you don't its the pump.

Good morning! Un fortunately you are going to have to obtain a replacement key from dealer. They will need vin # and proof of ownership to be able to cut you a new key. In some cases car may need to be towed to dealer for this procedure so additional keys can be programmed at same time.Hope this info helps you!

Save your self the hassle and expence of troubleshooting and replacement parts, install a suspension retrofit kit which changes the rear bags to coil springs and the front to struts. A car this old you might as well start over for less than $500.00......

reostat for the fan is faulty

check the ignition switch and if this be the case it is cheaper to find a salvage yard and have the column same as yours and change the whole thing just take the steering column to a lock smith along with the key and they will rekey it to the new column

try crankshaft position sensor. had one go bad on me

ive tried turning the ignition on and off three times or so....then turning it off completetly for about five secs and then turning the ignition all the way on and most of the time it starts up....but sumtimes i think this car has a mind of its own......