I've driven clutch all my life. 100% sure it is NOT my shifting. bought a used 2018 with 20k on it. in first and slightly in second gear, about half the time, AFTER I get off the clutch pedal, with gas about halfway down, the car SURGES like " JungaJungaJungaJungaJunga " as if I am quickly stomping the gas and letting off about twice per second. Never experienced this from any manual shifting before. Guessing clutch needs adjusted or replaced?? Hoping under warrenty.

Doesnt seem to happen at all on quick starts where I stomp to the floor, or really light starts. Just typical average starts and driving.

Just wanted to see if any one heard of this, experienced it or knows the cure.

 

This is pretty prevalent on these cars. Personally mine only does it at light throttle, about 22.5 or halfway on the MPG indicator.

Check out this thread for more info

https://www.fitfreak.net/forums/3rd-...g-stumble.html

 

Wow. That's just a bit crazy they can't run it smooth in 2018, while my 87 honda, 97 honda both ran just fine. ima go bother the dealer about injector replacements

 

I agree. I don’t know if you saw my data logs in the link I posted regarding ignition timing. I have had my car for several months now and have noticed that it seems like right after a fill up that the stumble is even more noticeable but only for a few minutes. Seems almost like it is testing the fuel for knock.

Looking at the data logs it almost seems that at a very light amount of throttle the ECU adds a bunch of timing then pulls it. I have seen values as high as 44 then it will drop to zero. This is why the car feels like it’s falling on it’s face.

Just a guess but it seems like at this light throttle amount that the ECU is continually adding enough timing to produce a light knock then pulling timing.

Just a theory. What is shocking to me is that it never triggers a check engine light. The first time I felt it I thought for sure it would turn on the CEL.

I believe I read about another forum member on here who is running a Ktuner and he mentioned that he still has the stumble.

I had a WRX that was running a Stage 2 setup and that car was a drive by wire deal. It had a tiny bit of surge at very light throttle and I wore my tuner guy out try to get it smoothed out.

If you take the car to the dealer have them drive on a slight uphill. On the live MPG gauge my car does it best when it’s right at halfway between zero and 45 (straight up) so 22.5 and from around 1600 to 2800 RPM.

Good luck

 

Thank you! Yes exactly. NONE of my older manual hondas did anything remotely close to this. I dont know all the numbers you speak of, but totally believe you.

In the thread you posted above, One guy said new injectors fixed it totally, and Honda even had a service bullitin about the issue. I'll push for that. It's livable, just seems rediculous in this day and age of programmable everything

 

I bought my 18 used with 15k on the clock. I took for a short test drive and unfortunately it never did this. If I test drove a new car and it did this I would never buy a car that ran like this. I have found that now that I am used to the car I can drive around the stumble. Right after shifting if you just pick up the throttle a little more than normal it will run smooth.

i too have had several Honda’s and several other cars and none have done this.

The car gets amazing mileage and I have gotten used to it.

There is a slight hill I drive that the car is in third gear and right at that 22.5 on the MPG meter and even in third the surging is very noticeable.

Keep us posted here if you do get the dealer to acknowledge the surging and if they do anything.

 

Here is the screen cap showing the ignition timing all over the place. Apologies for the monster pic haha! B is RPM, C is ignition timing and D is throttle position. You can see that the timing is all over the place and the throttle position is around 14.4 to 14.6%

I haven’t logged in quite some time but believe the throttle position at idle shows around 12.6%

Not sure why it does this but this is for sure what you feel when it suddenly pulls timing like that.

 

Every manual transmission Honda I have driven does that in low gear (creeping through a parking lot). I blamed the single mass flywheel. Brothers WRX does it, my dads Prelude.

 

NONE of my 4 hondas have EVER done this in low gears. this is why I noticed it so easily. it is a known issue I am finding out.

 

Any modern drive by wire car with a manual trans is going to be a little touchy and unsmooth when cruising in first gear and trying to lightly speed up like cruising a parking lot. To meet emissions and fuel mileage requirements they have to run the engine so lean that a little surge is unavoidable.

This is totally different . My brother had two previous generations of Fits and neither one had this issue.

As I mentioned if you can find a slight grade and use second or third gear there is a narrow throttle position where you can really feel the surging.

Worst case on mine at times it feels just like you flicked the key off for a second. I know when to expect it and just pick up the gas some to avoid the hiccups.

 

My GTI does not. It is silky smooth but it has a dual mass flywheel that would aid in keeping it smooth.

Take it to the dealer though so they can check everything out.

 

I agree and if you do and they acknowledge that there is an issue post the info here.

 

my 2015 dose pretty much EXACTLY what the original poster explained right off the dealers lot......it shouldnt do it....but it does.....so i live with it.

 

Mine's done this since new (2015). Not under normal relatively light acceleration, or heavy acceleration, only in the mid ground between the two. I'm at 117k miles and it's way worse.

I'm thinking it's the torque strut. If you look at it, you can see where it could set up an oscillation. I was going to do the GoPro thing last weekend, but my battery was dead. I bought one at Rockauto (last one, sorry). If that doesn't do it, I'll do the GoPro and make my own if I have too (not too hard).

I do see the variation in your data log, but wondering if it's the ECM trying to react to the motor rocking back and forth?? I'll keep every one posted.

 

My only other add would be to change the MT fluid (Honda Fluid 08798-9031 Manual Transmission) and maker sure the level is correct. You could choose to add Honda or find a 75W90 gear oil that meets Honda's spec (IIRC it is GL4 only AND NOT GL5). Miata and RX-8 racers use Ford's excellent MT fluid (part #XT-M5-QS full synthetic; works as is but has to warm up to be super smooth and not notchy) or Redline MT90 (stays smooth). I've seen many Civic owners use Valvoline Synchomesh MTF (GL4 grade).

IU use Ford XT-M5-QS in my Mazda RX-8 and used MT90 in my Civic VX until she was stolen from me and parted to the Gods of Thievery.

 

My 2015 has done this since nearly new as well. I hear and feel it every time I engage the clutch from a stop or low speeds, it's no longer an occasional noise. The dealer has looked at it but claim it's functioning as designed. I also think it's the motor & torque mounts. This thread has lots of good info regarding this issue. - https://www.fitfreak.net/forums/3rd-...long-rant.html

 

I'll have to admit, my 2018 Honda Fit Sport does this as well.

I never had this issue in the 2007 Fit.

 

Did a GoPro. Yes, I was trying to make it pulse, I don't drive like this normally. When I change my oil, I'll change out the torque strut.

 

robs, have you replaced the torque strut mount? Did it solve your issues? Was your trans mount also checked as well?

I just replaced the trans mount on my 2015 Fit after the dealer denied it was faulty multiple times. I also replaced the torque strut mount while I had it up although I don't believe it needed replacement. The version of the trans mount I had is an awful design. The 2 metal brackets that surround the rubber mount were so loose I could hear it clanking as soon as I got the engine weight off of it to remove it. Unfortunately the mount I replaced it with is of the same design so I fully expect it to fail in time.

The car feels much better now, I had adapted to the sloppy clutch feeling over time as the mount worsened. Such a shame they just don't build them like they used to. The mount issue as well as all the other issues this car has had since new along with the shoddy build quality and fit & finish has left a bad taste towards the brand. This will most likely be my last modern Honda after owning over 10 golden era models.

 

Yes, replaced last oil change about 1200 miles ago. It hasn't pulsed since! The original one looked OK, no cracking or anything, I didn't check motor mounts, but nothing is making noise...

There is only one part number for the strut that would be for both CVTs and MTs. Considering there's way more CVTs sold, it's probably more designed for them.

YMMV