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I have 1997 c 7500 3116 8wl02869 while driving engine light…

Customer Question
I have 1997 c...

I have 1997 c 7500 3116 8wl02869 while driving engine light will come on and reduce power and keep going then light will come on and shut off pull over and will not start back unless u spay it with starting fluid then it will run for another 10 or 15 ***** ***** and repeat I have .8 volts when solenoid valve is plugged up and 4.5 when it is not plugged up

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Truck will crak

Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Customer reply replied 2 years ago
truck cranks and run good like I said it will cut off driving down the road will not restart unless u spray it with starting fluid I checked the volts on the solenoid valve it has .8 if it is plugged up and 4.5 if u un plug it
Answered in 10 minutes by:
3/2/2016
Technician: Daniel Wilson,
 replied 2 years ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,720
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to help. what are you getting for fault codes? If you need to access them you can by holding the cruise set resume switch, key on and count the flashes of the engine light with short pauses in between each digit and a longer pause between codes. Let me know

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Customer reply replied 2 years ago
Code is 55
I under that is is saying no falts
Technician: Daniel Wilson,
 replied 2 years ago

Thanks for the update. Check for tach signal as if the speed timing sensors lose signal from a faulty sensor or harness the fuel will not be commanded on. I am assuming you verified good fuel supply to the pump and for leaks and restrictions between the tank and pump. Check the speed sensors for loss of signal and let me know if we need to dig deeper

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Customer reply replied 2 years ago
Tack has not worked I owned the truck fuil pressure is good it will run up the road full speed why would I have only 4.8 volts the ground pulses not continues my other 3126 has 12 volts and continues ground
Technician: Daniel Wilson,
 replied 2 years ago

Your fuel pressure must remain between 65-85 psi at all times and if it is dropping then first go for the pressure regulator at the back of the head. The second cause is a faulty transfer pump

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Technician: Daniel Wilson,
 replied 2 years ago

The fuel pressure must remain constant even under a load. If the fuel system tests good with a gauge installed then check for loss of speed sensor signal and verify you have good Injection actuation pressure. Should see around 870 PSI cranking and up to almost 4000 PSI at high idle. If low pressure you could have leaky injector o rings, faulty pressure regulator or high pressure pump

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Customer reply replied 2 years ago
Not actually checked oil pressure my concern is why do I only have 4.8 volts on the oil solenoid vavle should it have 12 volts like the 3126 in a 1999 FL 60 and the ground is pulsing I think it is something electrical
Technician: Daniel Wilson,
 replied 2 years ago

The injection pressure regulator you are referring to correct?

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Technician: Daniel Wilson,
 replied 2 years ago

The ECM controls the voltage to the IPR solenoid valve and it varies to control the injection pressure depending on RPM

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Technician: Daniel Wilson,
 replied 2 years ago

Check for good battery power to your ECM that you are getting full battery voltage there. Inspect the harness and connections for corrosion or damage

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Customer reply replied 2 years ago
Do u have wiring diagram or a link to site
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