Motor not starting up

Your welcome thats what were here for.

My 04 sentra is giving me some grief when the engine is cold its hard to start and when it does it idles very rough almost to the point of stall. Once it warms up it stops. I get a code the camshaft position sensor I replaced it and the spark plugs and still have the issue I'm at a dead end from my knowledge wondering if anyone else has any idea as to what could be causing it

Have you checked the fuel pump pressure to see if it is within the manufacturer's specs?

no i didnt I kept thinking fuel pump but didnt think it would throw a camshaft code

No, it wouldn't throw that code, but since you replaced it and it made no difference, that is where I would start.

so far its starting fine i had to move the sensor a little and it has started without any issues. is it possible that the old oil would cause issues with it reading

No, the oil wouldn't have caused that to happen.

I've replaced the crank shaft,belts, the mass airflow sensor and for years I've had problems starting my car. My mechanic has worked on it several times and every time my check engine light comes on it reads mass air flow sensor or CO2. I do not know what else to do. I've always changed my oil on time and it's been a really good car other than this. Any advice?

was it like this when you bought it?

No, I bought it new. I had it a couple of months before it started having trouble starting and I've had the same problem since. It's never been in an accident and I've replaced all I know of. My mechanic is even at a loss for words.

could be a lemon? some odd abnormal fault not easily detected. for instance, i had a vw gulf with a rough idle stall that i finally and LUCKILY tracked down to a loose contact pin in the computer harness plug!! i even changed the computer with no improvement!! dont know how i saw the loose pin, just luck!!

2004 Nissan Sentra 4 cyl Two Wheel Drive Automatic 100000 miles

my car will not start it sound like the batterie but the batterie is new and when I jump the car it starts right up what am I missing????

Could be the starter, starter relay,transmission position switch and ignition switch assuming the battery and connections are good.

Will not start. It cranks up, but will not turn over for some reason. have changed, ECC/both of them, crank and cam sensor, variable timing chain solenoid, unplugged the battery, checked the timing chain. I tried to check for a spark from the coils, but did not get any spark. Somebody please help me with this one.

try a security system reseet, see link.
https://www.2carpros.com/articles/how-to-reset-a-security-system

Engine Mechanical problem
2004 Nissan Sentra 4 cyl Front Wheel Drive Automatic 75000 miles

The first time I start my car in the morning, it turns over fine, but after driving for about 30 minutes, if I turn off the car, and try and start it again, it cranks for a good 10 seconds, but doesn't turn over. If I try again and hold down the accelerator pedal about half way, it usually starts up fine the second or third time. The problem is worse in summer weather, so I assume one of the causes is the heat. I have replaced the battery recently but haven't done much other work to it other then oil changes. I have checked for codes with a code reader and found nothing. After starting, the car runs fine and the temperature stays normal. Thanks in advance.

So, just an update after researching more, I have come to believe that I need to replace these parts. Search the codes up on google and I have found many people with the same problems as me being fixed after completing this...

Basically, you need to install a full Fuel Pump Repair Kit...

22670-8U70C - REGULATOR ASSY.
17342-01A00 - O-RING SEAL

The car starts and runs fine until it warms up and then it quits all the lights on then dash come on and then it wont start for about 15 mins. It turns over but wont start. Replaced the crankshaft position sensor and still no help.

scan for codes and check fuel pressure with a gauge first. autoparts rent it.

Try to start car just clicks, I have put in spark plugs, battery, starter and checked all fuses what else can I check or replace

Check for a poor ground coonnection from battery to transmission.

I recently changed Crankshaft and Camshaft sensor. But still the starting problem exist.
When I start first time in the morning it starts at the first attempt. If I again start it after 1 hr or so it will start at the second attempt. After keeping it parked for 2/3 hours, it will again start at the first attempt.

What could be the issue?

scan for codes and check fuel pressure with a gauge auto parts rent it

Hi Hmac300,
Thanks a lot for your quick reply.
Now your reply sends shiver down my spine:(
How much could be expected repair cost if there's an issue with the fuel pressure? I live in Houston, Texas.

if it's the pump about $500 but it may not be that . That is why you have to scan for codes and check pressure. it cold be a regulator or something else all together.