Nissan Repair: 1999 Nissan Maxima hard start, nissan maxima, leaky injector

Question
Hi,i am experiencing hard start when car is cold,after the car warmed up,much easier to start,every time when i step on the gas, it is easier to start as well,I just changed a battery and knock sensor,temperature sensor, checked fuel injector,i took to a work shop to check ,they couldn't find out the problem, what do you think the problem is?Many thanks!!

Answer
Peng,

Have the fuel pressure checked.  A leaky injector can cause a hard start when cold as one or more cylinders are basically flooded.  After the car is driven it is easy to start the car.  So, they could clean the injectors or replace the offending ones.  Have them take the plugs out and if one or more are really black that will give you an indication of the cylinder with the leaky injector.