2001 Ford Taurus - won't start. Cranks really good but engine won't start. Tested with good battery, fuel pump, plugs & wires. Car was driven daily. All of a sudden just didn't start no more. I was told it could be the coil or some crankshaft speed sensor. My problem is instalation. Are these difficult to install? Do you need a certified service tech to install? I have done several minor mech jobs. Car is a 2001 Ford Taurus 3.0 DOHC. Thank You very much for your help. -George

The car should start, even with low compression in some cylinders. Since two things are needed for combustion, fuel and spark, you need to figure out which is the problem. Remove a spark plug (or buy a spark tester from harbor freight) and check for spark at the plug. Without a tester, simply attach the plug wire to the plug while removed from the engine and rest the base of the plug on the engine block (grounding it). Have someone turn the engine over with the key and observe if you see a hot spark jumping the gap of the plug.
Recommend you go to the library and borrow a copy of Chilton's for your car model.

crank sensor located off the fly wheel in transmisson

May need this:

That suggests that the problem is in the harness, something in the connector or wiring is causing an open circuit. You will need to have the circuit tested to find the fault. Ford alternators have known connector issues & new aftermarket connectors are readily available at most auto parts stores.

Jiggle the wire connectors going in to the computer under the hood -- first check battery cables/terminal connections at battery -- beleive it or not, connection could SEEM good because you get crank & lights, but if it's faulty, loose, engine won't start - computer requires good solid voltage flow.. next check a fusible link very close to the battery off of the positive cable. check fusible link carefully. this could cause your problem for sure.

have someone check the fuel pump relay ,what type of car is it

Does it crank?If you shut it off and you restart after a few minutes and it cranks but won't start or starts and runs rough the injectors are leaking and flooding the engine. Need better description

possible problems would be fuel regulator problems, bad fuel pump, clogged fuel return line, clogged fuel pickup screen, clogged fuel filter, or clogged or stuck fuel tank breather valve/line/cap. easiest things first. look for a disconnected, lose, or warn vacuum line from the fuel pressure regulator to the intake manifold. next try starting the car without the fuel cap. if that works you probably need to clean or replace your gas cap. next i would check for fuel pressure. u can buy a pressure gauge from autozone for around 30 bucks and some will just do it for you. if youre pressure is good while the ign is on but when the car starts it drops your best bet is something is clogged. if it doesnt drop then you may have dirty injectors, bad spark plugs, or a bad distributor. put some injectory cleaner in there are run the car a few times, replace your plugs and wire, and have your distributor tested at autozone. if all that is fine/doesnt change anything you have an idle problem somewhere. test this by pressing the gas down a little bit while starting the car. if it stays running then you have idle problems. if so just comment and i'll help you out. i hope for your sake your regulator vacuum line is just unplugged or leaking. good luck to ya

Its not the oil, increasing temperature will thin out the oil. If it cranks easily but won't start it could be the spark plugs or the spark plug wires. When they heat up, especially if they are old, they won't perform well. Pull off one of the wires and hold it close to the plug, try to crank the engine and look for a spark. If it sparks them try removing a plug and check to see if it looks wet. If its bone dry it might not be getting fuel.

Have the fuel pressure tested. The check valve in the pressure regulator may be leaking down.