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Old 06-18-2017, 05:35 PM   #1
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Engine Over- Revs?

If you were to do a holeshot (mine is a '17 sedan SE with 2.0L engine) the engine keeps revving after you take your foot off the throttle pedal; you'd think that it would slow the revs as soon as you take your foot off. It makes me nervous, because if you had to brake suddenly while accelerating, your braking won't be as fast as if you were just cruising sat a steady speed.

It seems the engine is free-wheeling, or the return spring on the throttle is weak. Is this normal, and can you "fix" it to drive more like a carbureted car?

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Old 06-18-2017, 10:59 PM   #2
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This is normal. My 2017 escape does the same thing.
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Old 06-19-2017, 07:49 AM   #3
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I think my engine may even have some kind of blow-off valve, which might be related to this. When you use full-throttle for accelerating, you can hear some (air escaping noise) between gears, so it makes you wonder if there is some purpose to the revs not coming down quickly, as some kind of emissions-reducing scheme.
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Old 06-19-2017, 10:29 AM   #4
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Quote:
Originally Posted by GuitarZ View Post
I think my engine may even have some kind of blow-off valve, which might be related to this. When you use full-throttle for accelerating, you can hear some (air escaping noise) between gears, so it makes you wonder if there is some purpose to the revs not coming down quickly, as some kind of emissions-reducing scheme.
Blow-off valve would only be in the engine if you have a turbo. Otherwise what you're hearing is the reflected pressure wave caused by the sudden change in air demand that sends a small "burp" back up the intake.

The car is drive by wire, so the computer is choosing to keep the intake open despite the change in accelerator pedal position. Only way to change that would be a custom tune, and even then I don't know if Tom or anyone can directly affect that (never seen it referenced specifically)
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Old 06-19-2017, 11:36 AM   #5
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EMISSIONS.. EMISSIONS ..EMISSIONS.
The reason the engine hold RPM is due to decreasing emissions.
And yes the 'drive by wire' is responsible.
I can promise your panic stop is NOT going to be any longer distance because of rev hang. .

Try Googling "Rev hang and emissions"..
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Old 06-19-2017, 09:21 PM   #6
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I don't really notice this with the 5 speed and I take it right to redline and shift and it drops the revs appropriately.
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