1997 Grand Marquis wont start

check for spark, check fuel pressure at intake, if all else fails try to replace ECM.

If the code reader is reading error, make sure the code reader is functioning properly if so then I'd suspect the ECM in your vehicle may be shorted out. That would explain why there is no spark and a read error. I would check the wiring to the ignition coil and ECM before changing it, those old fords where bad for wire corrosion, specially if the vehicle is from the coastal regions or areas with snow/salted roads. You may have to unplug the main harness connections sometimes the corrosion happens inside the plug (pins) will look green or rusted.

I know this is an old question but for new readers I would drop the fueltank and flush it out. Gasoline goes bad after only a short time and turns into mollasses. Letting a car sit vacant for several months will make fresh gas look like glue and it's ignite-ability goes away too. Cleanout the fuel tank and add some fresh fuel and your problems will be solved. That is if you didn't keep cranking on it, also change the oil, If you kept cranking, you probably washed down the cylinder walls of all remaining oil loosing all or most of it's compression. Without compression, the motor will never start. Fresh oil and fresh gas is the answer everytime when a vehicle sits for long periods of time. MrBlueOval / Kenny.

Normally when there is a communication issue between the scanner and ECM, you need to check for power and ground to the ECM. Easy thing to look at, is the ECM fuse/relay. Its not uncommon for an ECM to go bad, especially in older vehicles. So, that may very well be the issue. I have replaced a few, due to shorts.

I have a 1996 grand marquis i just put motor in from another car it ran good now i can't get it to crank it just turn over i change the crankshaft sensor

Did the crankshaft sensor work