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Discussion Starter · #1 ·
Legit.

I know that these cars are electronically (as well as most other standard transmission cars these days) designed to have the RPMs hang for a second to allow grandma to find third and engage the clutch before the RPMs fall to idle, but to actually have the RPMs RISE... and rise QUICKLY up to 2000 RPMs higher?

It just started doing this tonight. And it started after an odd clicking/tapping/thumping sound on post-startup idle.

I drove to the tattoo shop like normal. Got in my car turned it on. Weird thumping tapping thudding sound was happening. I was in neutral, foot off the clutch, and ebrake on. Sitting there quietly listening to it. It was faint, but I could feel it in the floor on my feet. I got out, couldn’t hear it outside the cabin. It was distinctly coming from behind the dashboard but when outside and with my head down under the car I couldn’t hear it.

Got back in. Still there. I lightly tapped the gas pedal to head if the thudding would increase in pace with the RPMs. It did. It went away at like 1200 RPM. Fall back to 750 idle... there it is. Thudding. Repeated this and it kept doing the same thing.

So I nailed it up to 4K rpm. Fell back to idle. Now the idle felt stronger and more healthy. Smooth. Idling at probably 800-825 now. No noise. I was like great. Looked at my wife and said awesome. My ford made it 3000 miles off the showroom floor and already seeing weird demons. We laughed.

Turned on the 45mph highway and 1st to 2nd was kind of abrupt when engaging the clutch. Hmmm. I’m usually a smoother shifter than that. Okay. Even worse. Even more abrupt when I let the clutch catch 3rd. Now I’m like wtf. So now I gain speed, let off the gas and disengage the clutch, the RPMs literally go shooting from 3500 to like 5000. I look at my wife like WTF? Look at my gauge cluster. Watch the RPMs go up on their own!

She looks. I shift down to 3rd. I DONT EVEN HAVE MY FOOT ANYWHERE NEAR THE GAS PEDAL, all I did was disengage the clutch in 3rd gear at 3000 RPM and they quickly rose up to 4500. Hung there for half a second. And then fell to idle. I’m like WTF!?

I kept doing it to replicate the issue. It kept doing it. Not bad from 1-2. Kinda there 2-3. And worse from 3-4. Didn’t even try 4-5 or 5-6.

Turned the car off. Went into a different tattoo shop. Spent 15 minutes inside. Went out. Couldn’t replicate the idle thudding but the car was still doing the RPM surge on the way home.

WTF!? Car has 3000 miles. I’ve got Cobb RMM. Green air filter. Stock exhaust. Stock throttle body. Stock clutch. Stock flywheel. Stock injectors. Stock turbo. Stock stock stock!
 

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sorry to hear about your bad luck I would be super disappointed and saying wtf too dude.

I am sure you just need a sensor or something. I find every vehicle has at least one trip to the warranty shop. Hopefully you can go to the dealer you bought from (and they are reasonable). Should not be a big deal.
 

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Legit.

I know that these cars are electronically (as well as most other standard transmission cars these days) designed to have the RPMs hang for a second to allow grandma to find third and engage the clutch before the RPMs fall to idle, but to actually have the RPMs RISE... and rise QUICKLY up to 2000 RPMs higher?

It just started doing this tonight. And it started after an odd clicking/tapping/thumping sound on post-startup idle.

I drove to the tattoo shop like normal. Got in my car turned it on. Weird thumping tapping thudding sound was happening. I was in neutral, foot off the clutch, and ebrake on. Sitting there quietly listening to it. It was faint, but I could feel it in the floor on my feet. I got out, couldn’t hear it outside the cabin. It was distinctly coming from behind the dashboard but when outside and with my head down under the car I couldn’t hear it.

Got back in. Still there. I lightly tapped the gas pedal to head if the thudding would increase in pace with the RPMs. It did. It went away at like 1200 RPM. Fall back to 750 idle... there it is. Thudding. Repeated this and it kept doing the same thing.

So I nailed it up to 4K rpm. Fell back to idle. Now the idle felt stronger and more healthy. Smooth. Idling at probably 800-825 now. No noise. I was like great. Looked at my wife and said awesome. My ford made it 3000 miles off the showroom floor and already seeing weird demons. We laughed.

Turned on the 45mph highway and 1st to 2nd was kind of abrupt when engaging the clutch. Hmmm. I’m usually a smoother shifter than that. Okay. Even worse. Even more abrupt when I let the clutch catch 3rd. Now I’m like wtf. So now I gain speed, let off the gas and disengage the clutch, the RPMs literally go shooting from 3500 to like 5000. I look at my wife like WTF? Look at my gauge cluster. Watch the RPMs go up on their own!

She looks. I shift down to 3rd. I DONT EVEN HAVE MY FOOT ANYWHERE NEAR THE GAS PEDAL, all I did was disengage the clutch in 3rd gear at 3000 RPM and they quickly rose up to 4500. Hung there for half a second. And then fell to idle. I’m like WTF!?

I kept doing it to replicate the issue. It kept doing it. Not bad from 1-2. Kinda there 2-3. And worse from 3-4. Didn’t even try 4-5 or 5-6.

Turned the car off. Went into a different tattoo shop. Spent 15 minutes inside. Went out. Couldn’t replicate the idle thudding but the car was still doing the RPM surge on the way home.

WTF!? Car has 3000 miles. I’ve got Cobb RMM. Green air filter. Stock exhaust. Stock throttle body. Stock clutch. Stock flywheel. Stock injectors. Stock turbo. Stock stock stock!
Floor mats aren't hitting accelerator or anything right? Just eliminating the small possibilities first before getting mechanical.
 

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Discussion Starter · #4 ·
That’s actually not a bad thought! There isn’t much chance the floor mats would be catching anything though as they’re still new and stiff and aren’t even close to the peddle really. But a good suggestion!

I started the car this morning for work. Ambient temp was 61 (Southwest Florida lol) and there was no noise. All was normal.

Drove to work and all was normal. This will be, I fear, another case of “we can’t fix it if we can’t reproduce it”.

I’ll keep this thread updated on the problem. If I see it again or if I get it fixed.
 

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Almost this exact thing has happened to me actually. I have a '17 and am also right at 3000miles. And this has happened to me twice. Both times I haven't heard any weird sounds, nothing odd at idle. But while driving I'll clutch and all of a sudden just like you mentioned RPMs jump like 2k. So I let off the clutch, clutch again but then all is normal. It's happened twice, mid drive, not sure what gears though. I haven't really been too concerned about it though, it's only been twice and there's plenty of time for a warranty claim if it comes to that.

I'm also all stock with a green filter btw.
 

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Discussion Starter · #7 ·
Well I got the problem to happen again and got evidence of it this time. I’ll post back tomorrow when I upload the video to YouTube.
 

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Like someone else said, probably a sensor. Try resetting the ECU (remove battery cable for 5 minutes or so). Sometimes like our phones they just need to be reset. Shouldn't happen in a new car but it does just on occasion. Doesn't cost anything to try.
 

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Discussion Starter · #9 ·
Like someone else said, probably a sensor. Try resetting the ECU (remove battery cable for 5 minutes or so). Sometimes like our phones they just need to be reset. Shouldn't happen in a new car but it does just on occasion. Doesn't cost anything to try.
I don’t recall anyone saying to reset the ECU?

Does tuning reset the ECU? Because It’s happened on multiple different maps.
 

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I'm having the exact same issue now.
Mods: roush intake, Cobb rmm, turbo smart bov.
Everything else is stock with no tune.

Did either one of you get a fix for the issue?
 

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Something similar happened to mine a few weeks ago. My ST is a 2016 with 9000 miles on it, and i have a blank plate for the sound tube thing.

I was stopped at a light and went to push the clutch in to engage in gear getting ready for the green. When I pushed in the clutch the engine revved up to about 4000 RPM and held there for ~10 seconds before it dropped back to normal idle. I only had one foot on the clutch and one on the break.
 

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I went to the dealership today and talked to them about the issue. The bad (or good) thing is that it has only happened twice to me and it wasn't doing it today when I was there. They said it was nothing to worry about and was probably a fluke due to all the rain we have been getting lately.

They wouldn't look at it cause it wasn't acting up like before. I really hope this doesn't keep recurring. I'm going to film it next time it happens. If it happens again.

I forgot to add that I also have a sound symposer delete as well.
 

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Provided it's not any silly causes like floor mats, it sounds like an ECU issue and it's getting confused in it's closed loop tune trying to calculate something afr related. That or possibly a loose ground somewhere and it's confusing pedal position sensors and thinking clutch input is throttle input.

Have you tried removing the positive connector from the battery to reset the ECU?
 

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I've got a similiar issue on my 17'. I just hit 15k though. And I notice it more before the car has had time to warm up. My rpms dont shoot up nears as high though and i havent noticed it at idle at all but I get about a 500rpm jump pushing the clutch in while acclerating when im going to change gears. Its a bit annoying. I know these cars have some "rev hang" but not sure why the throttle would bump up a bit? Im FBO stage 3 as well running the Cobb OTS map for now (planned on getting a custom tune soon)
 

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Rev hang between shifts like there's a 30 lbs. flywheel is a programmed emissions-related annoyance, but rpm rise is something else. Unfortunately, my only guess on this is a sensor issue or something physically sticking/dragging the motor for the throttle plate.
 

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Glad to know I'm not the only one. I bought my car new back in June and noticed it within a few days of getting home. I can take off from a stop at normal speed and when I press the clutch in the rpms don't drop. When I let the clutch back out after changing gears the rpms will rise and really pull the car along...quickly too I might add. The first time it did this it caught me off guard and I slammed the clutch back in and hit the brakes thinking the gas was sticking. Since then it does it randomly. There is no sensor issue according to Ford. The car is designed to keep the rpms up at times to make shifting smoother. I find it VERY annoying and useless IMO.
 

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I heard the issues with the hanging rpms and rising is the throttle pedal. I’ve seen People complain on our local Facebook group and they all got new throttle pedals under warranty and it fixed it. Both for the RS and ST. Mine drops normally after I release the throttle, 43k miles, ST3.
 
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I heard the issues with the hanging rpms and rising is the throttle pedal. I’ve seen People complain on our local Facebook group and they all got new throttle pedals under warranty and it fixed it. Both for the RS and ST. Mine drops normally after I release the throttle, 43k miles, ST3.
Oh wow. This literally just started happening with mine. Usually in the first to second shift, rarely into third. Scared the crap out of me the first time because I was in a parking lot just slowly cruising hunting for a spot. UGH. I did not want to have to bring it in to the dealership this soon. I literally got it on Valentines day and haven't even hit 2k miles yet. I do like hearing that at least somewhere they are willing to fix the problem. Hopefully my attempt to get it fixed goes as well. Thanks!
 

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I've got a completely stock 2017 Focus ST with 9500 miles, and I've had this rising RPM rise issue for the past 4500 miles. It is getting worse with the warmer weather hear in Atlanta. Sometimes it will be fine for 20-30 min of driving, other times it happens on the initial drive. I'll rev the engine between shifts or heel and toe downshift, and it seems to clear up for a few minutes then comes back. 2k to 3k rise and sit there for 3-5sec happens regularly. I end up holding up traffic in between shifts to protect the clutch...my calls to Ford and visits with the local dealer all end up with "this happens to other ST's so it's normal operation"...What???!! ? Its getting to the point the car is no fun to drive anymore. Has anyone else had better results recently?
 
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