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Old 02-21-2014, 03:00 PM   #1
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Real quick noob question...engine RPM drop slow by design?

I know there are a few good reasons (ok, I'm lying, I only know of one - to reduce backfiring) to cause the engine to drop RPM's a little slowly near idle.

I've noticed when shifting to neutral coming to a stop that the RPM's drop a little slow down to idle. So you're in gear, see the light up a head change to yellow, then foot in clutch, foot off gas, shift to neutral. The RPM's drop relatively fast down to around 2,000, then somewhat slowly. Is this by design? Do your focuses do this too? Just want to make sure the car doesn't have a problem.

Other quick question. Mine's a 2009...is this throttle fly-by-wire? Didn't notice a throttle cable.

Thanks all.


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Old 02-21-2014, 04:16 PM   #2
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Yup & Yup

You figured it out right, "rev hang" is normal - emissions related & fly by wire throttle on your type.

If you take your foot off in gear, you'll notice it rollin' along without slowing much for a bit, then it closes the throttle more & starts slowing more normally.

Hate that wait on mine, I'd like a "tune" just to reduce that.
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Old 02-21-2014, 07:01 PM   #3
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Doesn't help for engine braking lol forgot to mention. Thanks!
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Old 07-11-2014, 10:49 AM   #4
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Can this be tuned out? I'm about to get a tuner to try and fix that and the whole can't go anywhere from a stop on occasion during WOT, scary when you're trying to pull out from a stop on a bad curve and cant go anywhere
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Old 07-11-2014, 01:54 PM   #5
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Quote:
Originally Posted by sailor View Post
Yup & Yup

You figured it out right, "rev hang" is normal - emissions related & fly by wire throttle on your type.

If you take your foot off in gear, you'll notice it rollin' along without slowing much for a bit, then it closes the throttle more & starts slowing more normally.

Hate that wait on mine, I'd like a "tune" just to reduce that.
Great next mod, Roger!!!!
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Old 07-11-2014, 01:59 PM   #6
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Quote:
Originally Posted by Gettysburg150 View Post
Can this be tuned out? I'm about to get a tuner to try and fix that and the whole can't go anywhere from a stop on occasion during WOT, scary when you're trying to pull out from a stop on a bad curve and cant go anywhere
Rev hang, as sailor called it, are rpm's not coming down right away. No idea if it can be tuned out. But the later part in ur post is different. The revs should come up right away. Sounds like ur engine is delaying its response to u applying throttle. Very bad like u said. Without going off topic too far, i recommend u get it checked out.
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Old 07-11-2014, 02:05 PM   #7
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Yea I know two different things, and yes I've experienced them both for a long time.

Engine runs fine and is sound, no faults, no knocks, no misfires, doesnt even burn or leak a drop of oil (I'm a tech, take pretty good care of it).

I've pretty much come down to it has to be tuning, sorry for the hijack OP

edit:

If it was a constant thing I'd probably take it over to Ford, but I had it in under the warranty period and it always had no faults on their scanner nor could they ever duplicate it. It's very rare, but the conditions are AC compressor clutch engaged, 1000-1200 rpm, starting from a stop (seems more noticeable on a slight grade), and rapid throttle application to 100%. The results are car takes at least a second to respond, its almost like the throttle valve stays shut or something, could be fuel or spark related as well, never stalls, just super bad hesitation
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Old 07-11-2014, 02:06 PM   #8
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To those talking about tuning, are there shops who can reprogram specific things like this? And on our cars, can it be flashed into the computer, or do u need a piggyback or hardware added or changed?
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Old 07-11-2014, 02:07 PM   #9
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I found that adding ground wire to the throttle body helps to quell this behavior a bit.
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Old 07-11-2014, 02:08 PM   #10
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Getty, i see. Ya that's a piss off, especially if the car gives no clues nor complains with codes.
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