Hard starting cranks fine and starts after 20 seconds of cranking, is a sensor out?????

Hi there I am technical mechanical and electronic engineer mechanic it need a new ignition switch or ignition lock n key

check the seal at the tank may be leaking air.

most likely is the crank sensor causing your problem

Map Sensor or Crank Sensor. If you have a code reader the map sensor should throw a code, the crank sensor most often will not. Both will cause the car to start, idle to around 1,000 R's and then die.

replace the crankshaft position sensor

It may be the CRANK SENSOR ,i had a car one time,it started fine,and drove fine one day i drove it about15 miles,stopped ,got back in it, started it, drove about 5 miles ,and cuts of with a little hesitation,it cranks but does not run, i sit there for about 20 minutes,crank it, it starts back ,i drive it back another 15 miles ,and runs great ** the crank sensor gives the signal to the ECM if the ECM ,never get that signal ,it does n't know to crank the car,or what cylinder to start with,check with your saturn ealer ,and get a second opinon

Not uncommon for fuel injected cars to start hard after prolonged storage. I have a 2001 truck for sale and today when I tried to start it - it started really hard, cranked on it for 20 seconds or so then let it rest and cranked again for 15 seconds before it fired
The cause is injected motor have a return line to the gas tank and over time the fuel pressure bleeds off - as long as it starts good 20 minutes after a hard start it is pretty normal

CRANK SENSOR CRANK SENSOR CRANK SENSOR

check crank sensor make sure that the crank is not rubbing the sides of the crank sensor

Check Air Flow meter/Sensor