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C7 CAT 2006. Will have a crank, not consistent. Sometimes 30…

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C7 CAT 2006....
C7 CAT 2006. Will have a long crank, not consistent. Sometimes 30 seconds, sometimes 10. No codes in the ECM. ECM gets power and see's TDC at crank immediately. Replaced Pump with new, not change at all. Has new batteries, new starter, tested the injectors... Any ideas ?
Submitted: 8 months ago.Category: Medium and Heavy Trucks
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10/13/2017
Technician: Cat Man, Cat Engine Expert replied 8 months ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,350
Experience: I am ASE Master Truck Certified.
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Thanks for asking your question. I will try and help you out.
Sounds like the fuel is leaking down. I see this a lot. Two things cause this.
First and most common is a faulty fuel pressure regulator on the back of the head. I would change it first.
Second is a faulty fuel pump on the back of the Heui.Please reply back if you need more help or have more questions. I am happy to assist.
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Customer reply replied 8 months ago
Both are replaced with new. Didn't change anything.
What else?
Technician: Cat Man, Cat Engine Expert replied 8 months ago
Thanks for the information.
The only other thing I’ve seen is a faulty engine speed timing sensor. Your engine has two. The lower one is the primary start sensor. I would change them next.
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Customer reply replied 8 months ago
tested both sensors, they are good. And should't they throw a code ?
Technician: Cat Man, Cat Engine Expert replied 8 months ago
No not always. I’ve seen them ohm good and still be faulty. Faulty at crank speed. Ok when running.
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Customer reply replied 8 months ago
Ill get them changed and get back to you.
Technician: Cat Man, Cat Engine Expert replied 8 months ago
Sounds good.
One way to verify is to check ac power to the injectors while cranking. You should have 20-40 ac while cranking. If you do not. I would suspect the sensors.
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Customer reply replied 8 months ago
put new sensors, same exact issue.... what else could it be ?
Technician: Cat Man, Cat Engine Expert replied 8 months ago
I would try checking ac power to the injectors while cranking. Let me know what you have.
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Customer reply replied 8 months ago
we are getting 93 V on all injectors.
Technician: Cat Man, Cat Engine Expert replied 8 months ago
Thanks for the information.
If you have 93 volts ac while cranking and a no start. You are electronically good. You have an rpm, tdc, signal. You have at least 870 actuation pressure.
All that’s left is worn injectors or low or no fuel pressure.
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Customer reply replied 8 months ago
Had all the injectors tested, all injectors are good. Have fuel pressure .
The engine will start and then periodically have white smoke. Took it on a test drive, plenty of power .Anything else ?
Technician: Cat Man, Cat Engine Expert replied 8 months ago
Nope that’s all. If you have ac while cranking. Got to be injectors or fuel
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