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Engine cranks but will not run

Tiny
SALDY
  • MEMBER
  • 2008 CHEVROLET EPICA
  • 2.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 190,694 MILES
Vehicle parking in the garage. The next morning I start the engine. It only cranks but wont run. Turn on ignition 12 Volts positive feed to coils and injectors okay. When start no pulse signal on both ignition coils and injectors. Camshaft and crankshaft sensors are new original GM parts.
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Tuesday, September 20th, 2016 AT 6:34 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try resetting your security system if no manual look online on how to do it.
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Tuesday, September 20th, 2016 AT 6:35 AM
Tiny
SALDY
  • MEMBER
  • 3 POSTS
I will add a few more details, after some attempts to start the car it runs okay fine very smooth. I let it run for thirty minutes and turn it off to have a lunch break. When I came back and I tried to start it again, it cranks but wont run. Same as before.
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Tuesday, September 20th, 2016 AT 6:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it it may be low especially when hot.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Tuesday, September 20th, 2016 AT 7:09 AM
Tiny
SALDY
  • MEMBER
  • 3 POSTS
Yes, I check the fuel pressure it is 45 psi. The main problem is every time the engine will not run. No negative pulse signal on both ignition coils and injectors. Ignition positive feed 12 volts is okay. I checked the wire continuity from crank/cam sensors going to PCM it is okay. When engine cranks, both sensors sending signal to PCM, but the PCM does not send pulse signal to coils and injectors. After some attempts the engine ran very smooth, but when I turn it off it will not run again. I checked all the ground wires, okay. Checked all the fuses okay, checked with launch x431 scantools no DTC. Thanks in advance for any help.
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Tuesday, September 20th, 2016 AT 7:46 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Did you try a security reset? Unfortunately we do not have any information on this car so check cranks sensor and do wiggle test at crank sensor that may be messing things up. They will go bad and not set a code if signal gets to PCM then it may be a bad PCM.
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Tuesday, September 20th, 2016 AT 9:30 AM
Tiny
JIS001
  • MECHANIC
  • 3,411 POSTS
Like HMAC300 stated, we do not have that vehicle here in the United States. But if you have a compatible scan tool try checking for codes. Also when problem starts, look at the live data on scanner and see if you have an rpm's reading. If no rpm's while cranking then you will not have pulse to the injectors or have any fire. If no rpm's I would suspect a faulty crank sensor.
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Tuesday, September 20th, 2016 AT 1:25 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Thank you for visiting 2CarPros. Com. If you have any other questions or concerns please come back to the site as we are always happy to help. Have a wonderful rest of your day!

Renee
Admin
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Tuesday, September 20th, 2016 AT 2:03 PM

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