Engine turns over but will not start

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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Friday, October 26th, 2018 AT 6:54 PM (Merged)
Tiny
LAZAROUS MWAPE
  • MEMBER
  • 1 POST
  • 2005 NISSAN ALMERA
  • 1.6L
  • 4 CYL
  • FWD
  • 21,000 MILES
My car is not starting just cranking. But I find there is no airflow sensor and one is at throttle body. There two sensors but one is throttle sensor but the other one I do not know it. So help me with the same.
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Friday, October 26th, 2018 AT 6:54 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
So what your real problem is that the car will not start. try resetting security system. See link.
https://www.2carpros.com/articles/how-to-reset-a-security-system
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Friday, October 26th, 2018 AT 6:54 PM (Merged)
Tiny
WEGENEY2012
  • MEMBER
  • 1 POST
  • 2004 NISSAN ALMERA
  • 1.5L
  • 4 CYL
  • 4WD
  • MANUAL
  • 66 MILES
Hi I got Nissan Almera 1.5 se 2004.I left almost 2 month I didn't start the car. After 2 month I try to start the engine the fuel light is lighting yellow and the battery is dead I jump battery from my friends car now the engine is cranks but it's no star I don't know what happens could you help me with that please or do you think that fuel problem thanks.
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Friday, October 26th, 2018 AT 6:54 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try resetting security system if no manual look online. Make sure the battery is charged enough to turn car over by itself.
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Friday, October 26th, 2018 AT 6:54 PM (Merged)
Tiny
ALLN
  • MEMBER
  • 2 POSTS
  • 2006 NISSAN ALMERA
  • 4 CYL
  • 2WD
  • 60,000 MILES
Hi I am at wits end, the Almera, only occasionally like today, is fine and when I park somewhere (out of the blue) the engine will not start, but turning over.

Please could you help me, as car stuck in bad area.

Kind Regards,

Allan
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Friday, October 26th, 2018 AT 6:55 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check if its a fuel or spark problem-Do below

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 so, 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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Friday, October 26th, 2018 AT 6:55 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2004 NISSAN ALMERA
  • 120,000 MILES
My nissan almera 1.8 petrol will not start. Have bought new battery and the diagnostic test failed to detect problem. Where else should I check, what could be problem?
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Friday, October 26th, 2018 AT 6:55 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
https://www.2carpros.com/articles/car-cranks-but-wont-start

Check the above link for more details.
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+2
Friday, October 26th, 2018 AT 6:55 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2006 NISSAN ALMERA
  • 130,000 MILES
2006 NISSAN ALMERA, 1.6 AUTO, WOULD JUST SWING AND NOT START BUT AFTER PLAYING WITH KEYS A LOT IT WOULD TAKE, SOMEONE CHANGED THE COLD START VALVE BUT IT STILL DOES THIS, JUST SWINGS, AND AFTER PLAYING WITH KEYS, LOCKING & UNLOCKING CAR TURNING IGNITION ON IT TAKES (ONLY AFTER A WHILE)
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Friday, October 26th, 2018 AT 6:55 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
We need more information than those you have written to be able to suggest what could be wrong and what to check. It could be the immobilozer/security system that is causing the problem but that is only a guess. Check the link below for information on how to go about checking for source of probem. If you keep changing components without diagnosing the problem, you are might be going to be wasting a lot of time and money plus the disappointment.

Whoever changed the cold start valve hoping it would solve the problem don't seem to understand the basics of the engine operating system.
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+1
Friday, October 26th, 2018 AT 6:55 PM (Merged)

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