poor starting!!

[prince_zorro]

i recently experienced a poor starting with my 172...it's needs 2 to 3 times to start in the morning!!!!>...
could it be the injectors????....any idea guys??

 

[16v_jon]

crank sensor mate get the new improved version with 4 pickups and a new loom connector

 

[walkie86]

over here one suggested fix is using BP Ultimate & letting the engine prime before turning the ignition over...