2006 taurus won't start has a new battery and starter
2 Answers
From your description the starting system is working okay, but the motor is not running, and has a knock. That knock will have to investigated, it could be something serious (timing chain, crank, piston or rod bearings), to something slightly less serious (valvetrain noise). If you've replaced plugs and wires recently make sure the plugs are back on in the proper firing order.
My car doesn't start in the morning and have to try 4 time before it start act like it out of gas