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I have 2008 Isuzu/Gmc, model w5500. I have stalling, no

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I have 2008 Isuzu/Gmc, model...
I have 2008 Isuzu/Gmc, model w5500. I have stalling, no power problem with this truck.
I have already changed the accelerator pedal sensor, fuel pressure sensor, fuel pump, glow plug control and still the truck is stalling and has no power. Could you please tell me what could be causing this. The next thing I think on changing is the rail. What do you think.
Please help
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 10 minutes by:
2/19/2016
Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 7,896
Experience: Shop Froeman for Freightliner Trucks
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good afternoon my name is ***** ***** I will assist

is this the 5.2 diesel???

are there any codes??? have you checked the fuel pressure???

do you have a scan tool???

Roy

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Customer reply replied 2 years ago
is a 5.2 diesel. I have a P0093 code, but we changed the fuel pump already. we have an IDSS11 scan tool
Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago

ok, good. what was the fuel pressure running??? you should be able to see actual fuel pressure.

Roy

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Customer reply replied 2 years ago
I see fuel rail pressure at 1.50 in low and accelerated goes up to 3.10
Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago

no, it should be a reading of about 4200lbs. you may be looking at voltages.

it sounds like you have injector issues which is very common. I have done quite a few of these for the code 93. does the engine missfire??

Roy

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Customer reply replied 2 years ago
no, no misfire at all. It just looses power while running
Customer reply replied 2 years ago
after changing everything I mentioned before, you think we have injectors problems?
Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago

ok, I still think you have injector issues. I remove them, send them to a machine shop that can clean them and have them pop tested and electrically checked to confirm any failure

Roy

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Customer reply replied 2 years ago
what test could we run to be certain we have injectors problems? I just don't want to spend more money without being certain
Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago

unless you have the bench for testing them, that why I suggest removing them and having them tested by someone who can confirm if they are any good

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 2 years ago

how are you making out

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