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Motor not starting up

Tiny
RANDYASEARS
  • MEMBER
  • 7 POSTS
Well they couldn't find anything wrong with it. It started right up for them and it never died for them apparently. It hasn't started right up without having to crank it a couple times in over a year. Now all of a sudden it started right up for them. They did run the computer on it and it came back to a Crankshaft position sensor. That is something other people with this same problem replaced and it didn't fix the issue. So I'm going to replace it but I doubt it's going to fix it. I'm definitely thinking it's a fuel pump. Others are saying that while the car sits, the fuel pressure bleeds out of the pump thus causing it to have to be cranked a couple of times to build the pressure back up to get it started.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Crank and cam shaft sensors are prone to fail due to heat, moisture and vibration. And will heal themselves
So always suspect and often throw no codes but crankshaft sensor did show up. That would be logical next step. Was fuel pressure checked?
Let me know what happens
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
RANDYASEARS
  • MEMBER
  • 7 POSTS
No they did not check the fuel pressure. They said the car was starting and running fine so they found no reason to go any further than running the code that was throwing the check engine light. I guess it's good b/c then I wouldn't be paying them an hour's worth of diagnosis if they aren't going to find anything but who knows, they could have found something. So all they did was run it on the computer. Nothing more. But yes, the check engine light does come on and off periodically. So you're saying it'd probably be a waste to replace that sensor or should I replace it?
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
No if crank sensor came up then replace and see if it is the fix. If it is throwing the code then replace
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
JCORDOVA1
  • MEMBER
  • 3 POSTS
  • 2004 NISSAN SENTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 149,900 MILES
2004 Nissan Sentra 1, 8s, The car will turn over but not start. I replaced the spark plugs and the crankshaft position sensor, after it shut off while driving on friday and would not restart. The car started up fine and ran for about 45 minutes on and off after those parts were replaced. Suddenly it died again and will once again turn over but not start. Might it be the ECM or a fuel system issue?
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
RANDYASEARS
  • MEMBER
  • 7 POSTS
Well I took it out for lunch today and it died on me again. It was running and starting perfectly before that. The mechanic told me to check for spark (as you guys have already told me to do). I'm going to be checking that today after work. If it's sparking then he's thinking it's the fuel pump
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You will have to see if its a fuel or spark problem
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
RANDYASEARS
  • MEMBER
  • 7 POSTS
So would a crankshaft position sensor cause the issues I'm explaining? Would a fuel pressure regulator/fuel pump cause these issues? I know on a honda we had a long time ago it was the same problems and it ended up being the fuel pump. I just don't want to order a $300 fuel pump and that not be the issue. I can change it easily by myself. That's just an expensive guess. Lol So my dilemma is, start with the sensor or just jump in with the fuel pump?
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
JCORDOVA1
  • MEMBER
  • 3 POSTS
I should have added that the fuel pump does turn on. Yesterday I took off the stock air intake and sprayed starting fluid in. The car would still not start right away, but about 30 minutes later it did. It ran idle for about 3 to 4 minutes than shut off again, I had the engine up to 2000 rpms with no problem, fuel flow seemed fine. When it shut down again I noticed that the temperature gauge reading was 1/3 of the way up. After waiting about 5 minutes and respraying some starting fluid, the engine almost turned on again, for a split second.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
I would do the crank sensor. Fuel pump should cause aother symptoms and not start up as quickly. And spark test is only valid if eninge is not starting and your able to determine you have either no spark or no fuel.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
JCORDOVA1
  • MEMBER
  • 3 POSTS
I should have added that the fuel pump does turn on. Yesterday I took off the stock air intake and sprayed starting fluid in. The car would still not start right away, but about 30 minutes later it did. It ran idle for about 3 to 4 minutes than shut off again, I had the engine up to 2000 rpms with no problem, fuel flow seemed fine. When it shut down again I noticed that the temperature gauge reading was 1/3 of the way up. After waiting about 5 minutes and respraying some starting fluid, the engine almost turned on again, for a split second.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
RANDYASEARS
  • MEMBER
  • 7 POSTS
Well it's not starting up quickly at all. It still takes a try or two to get it started. IF it starts on the first try, you have to crank it for 6 or so seconds and then it almost dies out unless you give it some gas to keep it running.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
CITYOFSTEEL
  • MEMBER
  • 1 POST
My car is going through the same issue. I just picked it upfrom the shop and it said Crankshaft Sensor code. I talked to one of my friends who has an altima 2.5L which has the same QR25DE engine as my sentra and he had the same problem and changed his sensor and his car was fixed. Funny that I am now having the same problem. It only cost him $125 to get it fixed at the shop.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
CHELLE147
  • MEMBER
  • 2 POSTS
I am having the same issue you. Did changing the Crankshaft sensor work? Also, is the Crankshaft sensor the same as the camshaft sensor?
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+1
Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
JOHNHARRISON
  • MEMBER
  • 1 POST
  • 2004 NISSAN SENTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 50,000 MILES
Engine Performance problem
2004 Nissan Sentra 4 cyl Front Wheel Drive Automatic 50000 miles

a couple weeks ago my car kep wanting to die at stop signs. I got to my destination, it sat for a while and then it started and was fine. Now it won't start. It turns over but just won't start.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello -

To better assist you I need to know if you have just the Sentra, or the S, SE-R, or the SE-R Spec V. Also, I need to know your engine size in liter.

Next, please go to Auto Zone (AZ) or O'Reilly's (OR) and use their loan a tool program and check out a code scanner to check the codes on your car. Once you check your codes, if you find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that.

We need to figure out if it is electrical or fuel related. Pull a plug wire off of the spark plug and insert something into the end of it and have someone try to start the car and have the metal object really close to a piece of metal on the engine and see if you are getting a good strong popping blue spark. Don't have your hands on any part of the metal! If there is no spark, then it is electrical.

If you are getting good spark then spray some starting fluid in the throttle body and try to start it and see if it tries to start then.

You may need to get a fuel pressure check on the fuel pump to ensure it is putting out okay. We will see.

Please do the above and get back with me.
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Saturday, April 29th, 2017 AT 2:04 PM (Merged)
Tiny
ADELIO1963
  • MEMBER
  • 1 POST
  • 2004 NISSAN SENTRA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
Service engine light came on. Drove it for two days, put snap-on scanner, forgot trouble code number but something like camshaft position sensor or wiring to it. I cleared code and left car overnight, next morning did not start, replaced sensor and it still won't start.
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Saturday, April 29th, 2017 AT 2:05 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Are you getting spark and fuel to the engine? Any chance of a broken timing belt?
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Saturday, April 29th, 2017 AT 2:05 PM (Merged)
Tiny
ATL075
  • MEMBER
  • 1 POST
  • 2004 NISSAN SENTRA
  • 4 CYL
  • FWD
  • MANUAL
  • 100,312 MILES
2004 nissan sentra. Car is not starting, I just replaced the battery, I hear the sound you suppose to hear from the feul pump when you turn it over. Gas is in the car. Could it be in my plugs or could it be the starter.
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Saturday, April 29th, 2017 AT 2:08 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
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Saturday, April 29th, 2017 AT 2:08 PM (Merged)

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