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I have a difficult start when warm or a no start. This has

Customer Question
I have a difficult start...
I have a difficult start when warm or a no start
JA: Will the headlights turn on? Is the battery fully charged?
Customer: Yes this has been an ongoing problem. Replaced injector pump for instance and seemed to take care of it for a time, only to begin again
JA: What is the model/year of your Chevy?
Customer: 2003 chevy duramax
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes, Put pump in. Plugged the pressure relief valve. Put on pump from tank
JA: Anything else you want the mechanic to know before I connect you?
Customer: Each time it works for a while. Seems when I open the system all is good for a time
Submitted: 20 days ago.Category: Chevy
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Answered in 18 minutes by:
11/21/2017
Chevy Mechanic: Jared D, ASE Certified Technician replied 20 days ago
Jared D
Jared D, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,997
Experience: Shop Supervisor at County Fleet
Verified

Good morning,

Typically when we see a hard start on these trucks that only happens when warm it is due to a bad injector or two.

Does the oil smell like diesel fuel at all?

Do you have a scan tool to check fuel rail pressure when the problem is occurring?

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Customer reply replied 20 days ago
No everything seems completely normal after start. No fuel in oil. Yes i have checked the pressure. It's low when I have the problem on starting hot. When I plugged the relief valve it worked right for about 1000 miles. Each time it seems to work but after time it resurfaces. Like a sensor resets and works right but only for a time. Injectors have been replaced and shows no signs of injectors being bad
Chevy Mechanic: Jared D, ASE Certified Technician replied 20 days ago

Have you been able to check the injector balance rates. They should be close to +/- 2.

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Chevy Mechanic: Jared D, ASE Certified Technician replied 20 days ago

Also check the return rate from each bank during a 15 second crank time with the engine disabled so it will not start. There must be less than 12 milliliters.

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Chevy Mechanic: Jared D, ASE Certified Technician replied 20 days ago

If you pump the fuel filter prime pump when it's acting up does it start right up?

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Customer reply replied 19 days ago
I haven't done the two tests but the prime is pressurized cause I have a performance pump on it, so the prime is pressurized all the time. I just checked it yesterday. Could the fuel injector control module or sensor be giving problems? Why does it work good when the system is opened up and than repeats? Do you have other thoughts than injectors?
Chevy Mechanic: Jared D, ASE Certified Technician replied 19 days ago

I got with a couple of my diesel techs here at the shop and everyone is thinking leaky injectors if the fuel rail pressure is low when the problem occurs. That's really all that could bleed down pressure like that.

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Chevy Mechanic: Jared D, ASE Certified Technician replied 14 days ago

Please let me know if you need additional info.

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Customer reply replied 14 days ago
I got interrupted, where I had no time to reply. My problem is not injectors. When I relieve the pressure even at the fuel filter, all works normal for a good amount of time. Something funny is not allowing some thing to reset or something like that. I have done this a number of times now and all is good after relieving the pressure even at the fuel filter.
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Jared D
Jared D
Jared D, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,997
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