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new theory on slow speed stumble?

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Old Mar 20, 2015 | 11:46 PM
  #1  
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new theory on slow speed stumble?

I posted about this in a previous post and blamed the engine/mapping. What's the possibility the slow speed stumble may be one of the ACTIVE SAFEFTY FEATURES listed on honda site affecting it? http://automobiles.honda.com/fit/specifications.aspx Vehicle Stability Assist™ (VSAŽ) with Traction Control, Anti-Lock Braking System (ABS), Electronic Brake Distribution (EBD) and Brake Assist. Seems to me that's a lot for the computer to continually adjusting for as well as engine mapping? I have taken it to dealer twice now and will be taking it back again! THIS THING AIN'T RIGHT! I test drove a new accord, civic and insight and none of which did what this thing does! EX 6 spd 3k+ miles. I KNOW THERE'S OTHERS OUT THERE!!!
 

Last edited by Jim Grames; Mar 21, 2015 at 09:17 AM.
Old Mar 21, 2015 | 12:03 PM
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ex 6 speed manual. only way to drive a honda!
 
Old Mar 21, 2015 | 10:12 PM
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Please refrain from insulting other forum users. This thread has been cleaned up and warnings have been issued.
 
Old Mar 21, 2015 | 10:25 PM
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Originally Posted by xxryu139xx
please refrain from insulting other forum users. This thread has been cleaned up and warnings have been issued.
thank you!
 
Old Mar 23, 2015 | 07:29 AM
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I have never experienced this slow speed stumble in my Fit, but can imagine how frustrating it must be. I'm thinking if you're trying to get across a street quickly when there is cross traffic approaching and the car bogs down, that can not be good. I had a previous car where that happened constantly and it is very disconcerting.
 
Old Mar 23, 2015 | 08:28 AM
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Originally Posted by GoBucky
I have never experienced this slow speed stumble in my Fit, but can imagine how frustrating it must be. I'm thinking if you're trying to get across a street quickly when there is cross traffic approaching and the car bogs down, that can not be good. I had a previous car where that happened constantly and it is very disconcerting.
The stumbling isn't that bad that it affects performance. It feels like a car that needs a tune up and its missing on one cylinder! But it has done this since new and now it has 3k miles and still does it!
 
Old Mar 23, 2015 | 05:06 PM
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Good luck. I wish I could help but mine runs like a top.
 
Old Mar 23, 2015 | 08:12 PM
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Is the ECO button on or off?

Mine does it a bit with the Eco on; it doesn't when it's off.
 
Old Mar 24, 2015 | 10:47 AM
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You got to learn how to use that clutch son!

No stumble here.
 
Old Mar 24, 2015 | 10:57 AM
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Originally Posted by jhn
Is the ECO button on or off?

Mine does it a bit with the Eco on; it doesn't when it's off.
I have 6 spd manual. There is no eco button.
 
Old Mar 24, 2015 | 11:00 AM
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Originally Posted by Fit_as_a_butchers_dog
You got to learn how to use that clutch son!

No stumble here.
Like how do you mean? And how would that affect a stumble from 1k to 2500 rpms?
 
Old Mar 24, 2015 | 12:32 PM
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On take off if I let the clutch go too quickly it feels like a stumble...what is happening is the engine is lugging. All manual transmission do this, only the fit is more pronounce because of the small engine with less torque. Ease up on letting the clutch go too fast and there is no stumble.

As Butchers Dog says gotta learn how to use the clutch better. The car being new you gotta get used to a new/differnt clutch just like any different car with a clutch that you aren't at home with yet. I had mine for almost 3months and about the same mileage as you and I still stumble the clutch now and then....usually takes me about 6months to totally feel at home on a new clutch. But having multiple cars with clutches I'm not sure if I will ever get used to or at least takes longer to get used to another clutch especially having just drove one then switching to another back to back.
 
Old Mar 24, 2015 | 12:40 PM
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Originally Posted by DaBinChe
On take off if I let the clutch go too quickly it feels like a stumble...what is happening is the engine is lugging. All manual transmission do this, only the fit is more pronounce because of the small engine with less torque. Ease up on letting the clutch go too fast and there is no stumble.

As Butchers Dog says gotta learn how to use the clutch better. The car being new you gotta get used to a new/differnt clutch just like any different car with a clutch that you aren't at home with yet. I had mine for almost 3months and about the same mileage as you and I still stumble the clutch now and then....usually takes me about 6months to totally feel at home on a new clutch. But having multiple cars with clutches I'm not sure if I will ever get used to or at least takes longer to get used to another clutch especially having just drove one then switching to another back to back.
I am 52 and spent time in army so I have driven every kind of motorcycle, army trucks, cars, pick ups and just about anything you can think of. I know how to drive a clutch so its not the driver and its not the clutch. The clutch is all ready fully released and I am accelerating and any where from say 1200 rpms to 2500 rpms it has a stumble like a bad plug wire. But not every time but most of the time. Above say 3500 rpms it doesnt do it.
 
Old Mar 24, 2015 | 01:02 PM
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Originally Posted by Jim Grames
I am 52 and spent time in army so I have driven every kind of motorcycle, army trucks, cars, pick ups and just about anything you can think of. I know how to drive a clutch so its not the driver and its not the clutch. The clutch is all ready fully released and I am accelerating and any where from say 1200 rpms to 2500 rpms it has a stumble like a bad plug wire. But not every time but most of the time. Above say 3500 rpms it doesnt do it.
With the clutch fully released at 1200 rpm I would say the engine will lug, that is the down side to smaller displacement.
 
Old Mar 24, 2015 | 05:35 PM
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https://www.fitfreak.net/forums/3rd-...cond-gear.html

Adding this thread to keep them together..
 
Old Mar 24, 2015 | 05:37 PM
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Two things I question the most.
  • clutch delay valve
  • direct injection shutoff under no load or deceleration
 
Old Mar 25, 2015 | 08:25 AM
  #17  
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You need to be shifting around 3000 rpm. This direct injected engine seems to like the mid range. The first day or two I was shifting too early, bump up your shift points...it will make a world of difference.
 
Old Mar 25, 2015 | 09:11 AM
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It's not about getting in the throttle hard or having to raise shift points. The car is not an old carbureted Camaro and is not bogging down or loading up on fuel, causing the stutter. These cars are engineered way beyond those days.

Not that I would ever drive it exactly the way Honda recommends but if you wanted to shift at their recommended shift speeds of 16, 26, 35, 41 and 43 mph.... The car should run perfect.

Even when a stumble occurs I don't think a passenger would know it happened. They would just assume it was not a flawless shift. I will go on to say that most stick shift drivers can't drive one smooth enough to notice what we are all talking about.

I know in the beginning I said it was not about having to get in the throttle hard enough. I guess if you wanted to drive the car hard you could avoid the 2000 RPM bad spot and it would never happen, I just don't feel you should have to drive it that way.

It can feel like the softest Rev limiter fuel cut out imaginable. This is why I believe it is related to the direct injection shutting off for a split second before making the shift. And then coming back on as you get back into the throttle. The direct injection shuts off when slowing down so I think during very slow acceleration it could sense no throttle and no clutch just long enough to cause a fuel issue.

Hope this bit of explanation helps.
 

Last edited by CyclingFit; Mar 25, 2015 at 09:31 AM.
Old Mar 26, 2015 | 06:39 AM
  #19  
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I shift around 14 to 15 mph at that speed the cars already around the 3k mark. What are you shifting out of first at? If I shift around 10 mph and let out too fast on the clutch I can simulate what you're saying is happening. To me it's driver error, shifting too soon and causing the engine to suffer the effects of being on the next gear at too low of an rpm.

Take from it what you will, but the shift points honda recommends come from the engineers putting thousands of hours into the production of a car.
 
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