12.7 Detroit no egr intermittent loss of engine power

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by supersize285, Oct 19, 2020.

  1. supersize285

    supersize285 Bobtail Member

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    Oct 19, 2020
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    Hello I have a factory reman 12.7L 60 series in a 2017 Freightliner Glider with about 300,000 mile on it. My driver is saying that the truck will run fine for a few weeks, then all of a sudden it will loose power and the fuel mileage with go from 7-8 mpg to 4-5 mpg and the truck will run like that for a few days or a few hours then come out of it, it has done this since the truck was new. The truck has also thrown a fault code 3 times in the past for injector 5, the injector was changed twice at the dealer under warranty and also had the injector harness changed out and tried a different ecm with no luck. Any ideas would be greatly appreciated
     
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  3. blairandgretchen

    blairandgretchen Road Train Member

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    Difficult to diagnose with 3rd hand information - how is he reading the mpg loss, and is it missing when this happens?

    I’d go for a cylinder cut out test under load.

    DCS can open and diagnose then tune the ECM if you think that’s the issue.

    Checking solid ground connections wouldn’t hurt either.
     
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