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I have a 2014 mack granite series with a spn 1127 fmi 1

I have a 2014...

I have a 2014 mack granite series with a spn 1127 fmi 1 code. i need to know where to start.

Mechanic's Assistant: Have you seen this error before with the same vehicle?

No. the truck is deleted

Mechanic's Assistant: What's the make, model, and year of your truck?

2014 Mack Granite

Mechanic's Assistant: Is there anything else the Mechanic should know before I connect you? Rest assured that they'll be able to help you.

The truck had the injectors sent out for testin, they all came back good but the mechanic did not put new injector cups in. im getting bubbles in my fuel tank fom the fuel return

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Answered in 1 minute by:
5/26/2021
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,447
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
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Customer reply replied 1 year ago
Sounds goodsounds good
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago

On your question, if you are getting bubbles back out of the return and the fuel delivery system is good I would change the cups out. This unit will have the stainless cups and they do not reseal well. If the injectors are leaking that causes a drop in manifold pressure which will result in loss of boost pressure for this fault. I would also check for any charge air system leaks, run the vgt and egr test to make sure there are no issues there as well. Then make sure the boost sensor is not all sooted up or reading biased.

Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,447
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
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Customer reply replied 1 year ago
I have checked the air to air system and no leaks to be found. Brand new turbo that I reprogrammed this morning and passed no issues. The egr is deleted so no issue there and I just installed a new boost sensor a little bit ago with no change. Thanks for the input
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 1 year ago

My pleasure, Have a good day

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