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Old 01-21-2013, 08:58 AM   #1
89raggtopp
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Default 2010 cranks but won't start

If car sits more than 6 hrs it will crank but not start. If the gas pedal it pushed to the floor it starts. If the car is warmed up it starts fine. Replaced purge valve and still same problem.
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Old 01-21-2013, 04:27 PM   #2
Dilatory
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Default Re: 2010 cranks but won't start

I'm no Master tech but that almost sounds like a fuel pump issue.. and with GMs reputation with fuel pumps wouldn't be largely surprising..
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Old 01-21-2013, 04:49 PM   #3
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Default Re: 2010 cranks but won't start

Quote:
Originally Posted by 89raggtopp View Post
If car sits more than 6 hrs it will crank but not start. If the gas pedal it pushed to the floor it starts. If the car is warmed up it starts fine. Replaced purge valve and still same problem.
If you smell gas when this happens its flooded...may be a no spark issue also.
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Old 01-23-2013, 03:05 PM   #4
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Default Re: 2010 cranks but won't start

Thread moved from Gen8 to Gen7 section. Watch where you post.
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Old 01-24-2013, 09:09 PM   #5
scott37300
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Default Re: 2010 cranks but won't start

When you push the pedal to the floor it goes into clear flood mood. So if it starts when you do this I would think that your car is flooding. Maybe bad FPR that is leaking when it sits, I know there was an issue like this with the impalas a few years back. You should be able to take the vacuum hose of the FPR while it's running and it might take a few minutes but if it is leaking you should smell or see fuel. But if it will start when you push the pedal to the floor I would be checking for things that would cause a flood situation.
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Old 01-24-2013, 11:58 PM   #6
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Default Re: 2010 cranks but won't start

Quote:
Originally Posted by 89raggtopp View Post
If car sits more than 6 hrs it will crank but not start. If the gas pedal it pushed to the floor it starts. If the car is warmed up it starts fine. Replaced purge valve and still same problem.
Put a gauge on the fuel rail port to check pressure during a cold start. Range should be 50-60psi. A stuck-open purge valve usually pops a code & typically only causes flooding immediately after refueling.

No codes or other symptoms?
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Old 01-25-2013, 12:24 AM   #7
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Default Re: 2010 cranks but won't start

Quote:
Originally Posted by scott37300 View Post
When you push the pedal to the floor it goes into clear flood mood. So if it starts when you do this I would think that your car is flooding. Maybe bad FPR that is leaking when it sits, I know there was an issue like this with the impalas a few years back. You should be able to take the vacuum hose of the FPR while it's running and it might take a few minutes but if it is leaking you should smell or see fuel. But if it will start when you push the pedal to the floor I would be checking for things that would cause a flood situation.
They don't use separate regulators anymore. They are built into the pump assy.
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Old 01-25-2013, 04:52 AM   #8
scott37300
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Default Re: 2010 cranks but won't start

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Originally Posted by greenman View Post
They don't use separate regulators anymore. They are built into the pump assy.
I didn't know that. What about a leaky injector?
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Old 01-25-2013, 05:31 AM   #9
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Default Re: 2010 cranks but won't start

Floored gas pedal to get it to start is a symptom of a leaky injector. Leak down test is the diagnosis for that. Fuel pressure gauge attached and seeing how long it holds pressure is the test. Don't know if there is a pressure port on your car though, someone more familiar will know that.
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Old 01-26-2013, 10:44 AM   #10
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Default Re: 2010 cranks but won't start

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Originally Posted by repairman54 View Post
Floored gas pedal to get it to start is a symptom of a leaky injector. Leak down test is the diagnosis for that. Fuel pressure gauge attached and seeing how long it holds pressure is the test. Don't know if there is a pressure port on your car though, someone more familiar will know that.
I just looked in the service manual and the 2.4 and 3.6 should have a service port schrader valve.

What is normal for time for the fuel pressure leak down test? Minutes or hours and how much of a drop is normal?

Is a leaky injector something that can be fixed with a good fuel injector cleaner(like what the dealers use) or do you just replace the injector?
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