2007 Nissan Sentra SL 2.0L will not start

Question

I have replaced the CAT converter, sensor, and now the fuel pump on my 2007 Nissan Sentra SL 2.0L.  It will turn over but won't start or only run for 3-5 seconds and die.  Please help!

Answer 1

Sound like a alarm kills the engine, If the alarm is not the issue, look at the MAF air duct for any torns or anything missing , If there is enough false air, you would encounter a engine that would just turn on then stall out unless you hold the accelerator pedal to the floor.

​ Tear that is hidden from view on the bottom side can go unnoticed , this would cause false air and stall the engine at idle.

 Here on this Nissan 2.0. there was a missing piece on the MAF air duct this allowed for false air , the engine would start then stall