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How can I fix my Aveo that is so hard to start after 4 or more hours of not running?

Tiny
JUANJOAGUDELO
  • MEMBER
  • 2007 CHEVROLET AVEO
  • 55,000 MILES
Hello, I have an Aveo 2007 sedan and it is almost impossible to get it started in the morning or after I am leaving home from work.
I had checked the battery and it is OK, replaced the Spark plugs, replaced the ignition wires, checked the pressure of the fuel and it is within range (55-56 psi) checked the coil and it has spark on all the cylinders.
It seems to get flooded with fuel when I crank it up in the morning and the only way to get it started is cranking for long periods of time until the battery almost gets flat.
The car runs great after I get it warmed up. It doesn't show any problems.
I can start it again without any problems if it hasn't been sitting for some hours.
Could you please tell me what else I could check? Someone told the the fuel pressure regulator
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Sunday, November 6th, 2011 AT 8:50 PM

9 Replies

Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I did check and there is a spark. The fuel pump comes on when I turn the key on. The engine seems to flood with the cranking.
Is there a check valve or something? How about the Camshaft position sensor?
Thank you very much
Juan Agudelo
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Sunday, November 6th, 2011 AT 9:29 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You got spark-now you need to check fuel and compression for combustion-check for fuel pressure and then engine compression
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Sunday, November 6th, 2011 AT 9:31 PM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
The engine seems to flood while the car is parked and not on for long period of time, ie: overnight. Could it still be the pump (since the fuel regulator comes together with the pump, as I have learned today)
What do you think. Thank you very much
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Monday, November 7th, 2011 AT 2:10 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Just to add this one I would check for a bad coolant temp sensor that can cause it to flood while starting after sitting a while.
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Monday, November 7th, 2011 AT 2:37 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Coolant sensor will flood it out if it doesn't switch to closed loop mode
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Monday, November 7th, 2011 AT 3:09 AM
Tiny
RAMONLOAIZA
  • MEMBER
  • 3 POSTS
I have exactly the same issue as juanjoagudelo and I have also replace the coolant temp sensor because made sense to me and I am in the same spot, in the morning when engine is cool.
So I heard that maybe the fuel pumps loses preesure when the engine is not working for several hours.
I wonder if this is true?
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Monday, March 4th, 2013 AT 9:13 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if its within specs-start here

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting
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Monday, March 4th, 2013 AT 9:51 PM
Tiny
RAMONLOAIZA
  • MEMBER
  • 3 POSTS
To rasmataz. Ok I will check the fuel pump pressure, but I wonder if the fuel pump is bad, I mean poor pressure why after engine start every thing work perfect and then I can turn the engine off and back on without any problem.
Is just at the cold start usually in the morning or when the engine was a long time stop.
In the morning after two tries if the engine does not start I need to wait hours for the next try and there is a strong smell a gasoline.
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Wednesday, March 6th, 2013 AT 7:29 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light? Test the coolant temperature sensor and still check the fuel pressure
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Wednesday, March 6th, 2013 AT 8:45 PM

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