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Thread: 400r issue

  1. #1
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    400r issue

    Have a single 400r on a flats rig, six months old. Yesterday I was pushing it pretty hard and when I backed off the throttle from wot in some turns then went wot again it was bogging around 5k rpm. Almost seemed starved for fuel or air. If you eased into the throttle it wouldn’t do it. Anyone have any idea what the issue would be?

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    Did it throw a code? Prob try scan it?

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    2.5 your on the money - SCAN - it an know - too far to dealer? Prop ?

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    Quote Originally Posted by kellytheaker View Post
    2.5 your on the money - SCAN - it an know - too far to dealer? Prop ?
    Hell with all tech goin into these motors, like a vehicle, scan it and see if it throwin sumthin , wouldnt b surprised if these things had check engine light nowadays haha

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    pencil coils can act up and not throw a code

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    Quote Originally Posted by bradmd View Post
    pencil coils can act up and not throw a code
    Pencil coils can act up. I know on the smaller stuff you will feel the vibration, but maybe the 6 cyl you wouldn't as much. Theres something with the VST tank too, pump float switch or something can act up, killing the HP fuel pump. But yeah, your going to want to plug that guy in.


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    Quote Originally Posted by InjectorService View Post
    Pencil coils can act up. I know on the smaller stuff you will feel the vibration, but maybe the 6 cyl you wouldn't as much. Theres something with the VST tank too, pump float switch or something can act up, killing the HP fuel pump. But yeah, your going to want to plug that guy in.
    verados 400 no float switch, as a matter of fact 2015-up Gen5 no more float switch on the VST. His problem is problably fuel related or like previously mentioned a coil going bad, or he could of had the rubber boot in the intake cracked.
    Big and slow

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    Thanks for correcting me, I was not aware of that.


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    Some of these are experiencing the boost pipe between the compressor and the intercooler slipping out of the coupler. Might want to check that.

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