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I have a 08 cat c7 on a f650 cass. getting code spn 3473 fmi…

Customer Question
I have a 08...

I have a 08 cat c7 on a f650 cass. getting code spn 3473 fmi 31 amd spn 4077 fmi 16 and am not able to run my regen for the dpf system.

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

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Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

Yes.. ive pulled and cleaned ard head. new ign. plug ( I have good spark was tested with new plug) ave filters in them. had dpf filter baked and cat. and temp sensors tested.

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

I originally was getting a low fuel pressure code. after i did all that now im getting the high fuel pressure codes that i gave you about.

Submitted: 3 years ago.Category: Medium and Heavy Trucks
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Answered in 17 hours by:
9/13/2019
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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Thanks for asking your question. I will try and help you out.
The system will not regen as long as these codes are active.
Code 4077-16 fuel pressure is often caused by a faulty fuel enable valve.
Code 3473-31 failure to ignite can be caused by a faulty ard head, speak plug, or low fuel supply.Please reply back if you need more help. I am happy to assist.
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Customer reply replied 3 years ago
regarding code 4077-16 I've replaced both main and pilot fuel valve/ silanoide .. and have check correct voltage .
as for second code I've replaced plug confirmed fuel flow pressure to ard head. ive cleaned and inspected ard head (ard head was replaced less then 6 months ago) .. I was looking for additional procedures ive already done all the common sense steps for these problems....
Technician: Cat Man, Cat Engine Expert replied 3 years ago
I would suspect the fuel enable valve.
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Customer reply replied 3 years ago
I already replaced that .. it's called the pilot valveThe only other part is the fuel regulator.
Technician: Cat Man, Cat Engine Expert replied 3 years ago
No it’s not. There are three valves. There is a fuel enable valve. A pilot valve, and a main valve.
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Customer reply replied 3 years ago
Do you know where it would be located.. according to Caterpillar there's only 2 .. but they have been wrong a few times on this one.I'm not trying to argue I'm just very frustrated cause caterpillar is constantly pointing me in wrong directions
Technician: Cat Man, Cat Engine Expert replied 3 years ago
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Customer reply replied 3 years ago
It's on the back side of the compressor?
Customer reply replied 3 years ago
Ok I'll get in and take a look .. I'm out for the day but will get back to you in the morning.. thanks for the info and your time.
Technician: Cat Man, Cat Engine Expert replied 3 years ago
You are very welcome. I am happy I could help.
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