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Guest Message by DevFuse

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Register your Fusion Hybrid at the official Ford authorized registry here.

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Weird Issue

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1 reply to this topic

#1 OFFLINE   rwhgme


    Fusion Hybrid Member

  • Fusion Hybrid Member
  • 61 posts
  • Region:U.S. Northern Plains
  • Location:Shawnee,Ks
  • Current Vehicle:2015 Fusion Hybrid
  • My Hybrid's Year:2015

Posted 12 August 2017 - 07:58 PM

2015 FFH. 29,000 miles. Was entering a controlled access highway. Moderate acceleration..3,000 rpms...all of a sudden, at about 60 mph it felt as if I shifted into neutral and the rpms jumped to about 4500. I backed off the throttle and it appeared to return to normal. I was on a slight incline when it happened. Anyone else have had an occurrence like this? Thank you!

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#2 OFFLINE   murphy


    Fusion Hybrid Addict

  • Fusion Hybrid Member
  • 1,531 posts
  • Region:U.S. Northeast
  • Location:PA
  • Current Vehicle:2013 Fusion Energi Titanium

Posted 13 August 2017 - 04:43 AM

The RPM of the engine has almost no relation to the speed of the car.  The computer sets the engine RPM for maximum efficiency of the engine.  At 60 mph almost all of the propulsion comes from the electric motor.  If the HVB battery charge dropped to its minimum allowed low point the engine would speed up to provide more power for the electric motor and more direct drive from the engine. 


Your throttle pedal is not connected to the engine.  It is two potentiometers that are connected to the computer.  It tells the computer what you want.  The computer decides how much comes from the engine and how much comes from the electric motor.


Your observation is normal operation of the system.

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