Jerky Throttle After Reflash

[dracolnyte]

I noticed after my APR reflash, my car has been very jerky when I go light on the throttle during rush hour traffic.
I would be traveling at around 10mph/16km/h and the tach is around 1,000 - 1,500 rpm, I let go of the throttle and the car jerks back and forth.

Transmission shifts are fine, but its only when I let go of the throttle at low revs (in the same gear) that it jerks around; it feels as if something is disengaging really roughly. This doesn't happen over 1,800rpm or over certain speeds though.

Did the reflash caused this or is there something wrong with my transmission?

[naemcivic]

have you done a VCDS scan lately?

[dracolnyte]

i did one a week after my flash. um cleared all the codes, everything was fine. i will do one tmr

[John_JRP3]

Mine is kind of like that in a way. just got my apr installed a few days ago. at a bout 3k it really hits hard now.

[benspeed83]

I am having the same problem. It is hard to describe but it isn't turbo boost...maybe it's a tranny issue or something. I had the APR tune done over a year ago and the issue just started about a week ago.

[dracolnyte]

I am relieved to know that I am not the only one experiencing this out there with the reflash. Phil, i know yours is a manual, so it doesn't affect you at all.

[Blake P]

Just a thought, but if you guys have the stock program installed as well, switch to it and see if it has something to do with the APR map or your transmission.

[dracolnyte]

Just a thought, but if you guys have the stock program installed as well, switch to it and see if it has something to do with the APR map or your transmission.

was planning to do that tmr, i did not get a chance to drive at all today

[ikotua]

yep, same thing here... it starts to jerk a bit around 1.4k–1.6k rpm, but I am getting used to it. In stock mode – all good.

[ikotua]

yep, same thing here... it starts to jerk a bit around 1.4k–1.6k rpm, but I am getting used to it. In stock mode – all good.

[wyld]

There was a TSB for this. APR recommends you update your ECU at the dealer before flashing.

The other thing you may be feeling is the slight "jerk" as part of the valve lift system changing profiles. You can actually feel this in stock mode too but it is very faint. The extra boost of the software makes it much more noticeable.

[naemcivic]

There was a TSB for this. APR recommends you update your ECU at the dealer before flashing.

The other thing you may be feeling is the slight "jerk" as part of the valve lift system changing profiles. You can actually feel this in stock mode too but it is very faint. The extra boost of the software makes it much more noticeable.

this

[ms3008]

yep, same thing here... it starts to jerk a bit around 1.4k–1.6k rpm, but I am getting used to it. In stock mode – all good.

Yeah I have that ever since I got the APR flash. Got used to it though...however irritating it may be..

For me, it happens at low revs and usually in gears 1 or 2.. so getting the ECU flashed back to stock by the dealership and then reflashed by APR would help?

[Blake P]

Yeah I have that ever since I got the APR flash. Got used to it though...however irritating it may be..

For me, it happens at low revs and usually in gears 1 or 2.. so getting the ECU flashed back to stock by the dealership and then reflashed by APR would help?

Something to consider for those with '09s is that once the dealer updates the ECU, I think I remember APR saying that re-flash would then have to be done like the '10+ where the ECU has to be removed. No thanks.

[ThePiombino]

Something to consider for those with '09s is that once the dealer updates the ECU, I think I remember APR saying that re-flash would then have to be done like the '10+ where the ECU has to be removed. No thanks.

I can confirm this.

[coolwater]

More power more problems sighs...
Does the stasis or giac tune experience the same issues?

-cW

[Blake P]

More power more problems sighs...
Does the stasis or giac tune experience the same issues?

-cW

FWIW, my car doesn't have the jerky trans (yet?) after APR flash. I drive only in S or manual shift, if that makes a difference.

[ms3008]

Something to consider for those with '09s is that once the dealer updates the ECU, I think I remember APR saying that re-flash would then have to be done like the '10+ where the ECU has to be removed. No thanks.

oh I didn't know that. Yeah that's not good then. Thanks for the update!

FWIW, my car doesn't have the jerky trans (yet?) after APR flash. I drive only in S or manual shift, if that makes a difference.

really? Let me try this to see if it makes any difference...but driving in S all the time? Wouldn't your mileage drop? I'll still give it a try anyways.

[dracolnyte]

I tried both S and manual, didnt make a difference as long as its in low revs

[Pip]

Maybe wait a couple more days (with lots of driving) for the ECU to get adjusted ? Just a thought :)

[dracolnyte]

I drove to work this morning back in stock mode and the jerking was significantly reduced. However it is still present when i feather the throttle, but not when i release it.

[MrStuff]

Something to consider for those with '09s is that once the dealer updates the ECU, I think I remember APR saying that re-flash would then have to be done like the '10+ where the ECU has to be removed. No thanks.

I remember reading that too. so +1

[latintrpt]

I'm having the same exact issue as described with my modded 2010 Audi A5

http://www.audizine.com/forum/showth...e-accelerating

[Bairum]

If this is related to the transmission as someone earlier guessed, then I would assume people with manuals don't have this issue? Can anyone confirm?

[latintrpt]

I have 2010 A5 manual

[Ryan_T]

Either I didn't feel this, or I don't have it. But I never felt any more jerkiness in the throttle response before/after APR.

Are you guys talking about the slight dip in power as it gets moving around 1-2?

[latintrpt]

Mine feels like it's almost choking when I'm accelerating. I can here the whistling of the turbo, but it doesn't sound as one whole whistle, it gives a like 3 little whistles almost like it's choking. Sorry, but that's the best way I can describe my situation. I can hear it pretty good because I have an intake.

[coolwater]

That's not good. Same thing in stock mode? Or can you not run stock because of the HFC?
-cW

[latintrpt]

I have not put it in stock mode, I going to take it to a shop to get some diagnostics done on it.

[dracolnyte]

That's not good. Same thing in stock mode? Or can you not run stock because of the HFC?
-cW

I go back into stock mode and the jerking is less noticable but it is clearly still there. I think it might have something to do with the HFC, it also makes my butt/seat rumbly at low revs.

I also notice that it happens often over low gears (1-2)

[dracolnyte]

Either I didn't feel this, or I don't have it. But I never felt any more jerkiness in the throttle response before/after APR.

Are you guys talking about the slight dip in power as it gets moving around 1-2?

ryan,

try going on the 401 during rush hour, guarantee it will shake your brain out!

[B8_Jim]

If you guys sit at idle in neutral and just barely add pressure to the throttle (try to take 15 sec to smoothly go from 800 rpm to ~1500 rpm) is the rev increase smooth or does it kind of stutter?
Is it worse when the engine is "cold" but after the warmup high RPM time?

[rustyshacklefrd]

the ECU stock is supposed to be "adaptive" in that it tries to "learn" your driving style. idk if the apr flash retains this feature, i was actually wondering that earlier, but maybe since they cleared your programming its trying to re-adjust.

[Ryan_T]

ryan,

try going on the 401 during rush hour, guarantee it will shake your brain out!

I've been in rush hour many times...I don't remember getting shaken to the point that I remembered it.

[dracolnyte]

I've been in rush hour many times...I don't remember getting shaken to the point that I remembered it.

what do you have on your car?

[Ryan_T]

Stg I only.

You're making me curious. Maybe we should meet up sometime and let me ride in your car.

[dracolnyte]

Stg I only.

You're making me curious. Maybe we should meet up sometime and let me ride in your car.

sure come ride and try it out with me. but i think the problem has something to do with the HFC/stg II

[Wah]

I experience a very similar jerking that you speak of; it is normal!

I'm guessing you have the S-tronic gearbox - these dual clutch systems react very similar to a MT.
When you are moving at such low speed as you mention, the clutch is completely intact.

For those of you who have driven a MT, you would experience the same feeling if you were to speed up to about 10 mph, release your feet from the pedals and let the car slow down independently.

Nothing to worry about imo

[kmjmrq]

I only had jerky throttle when I had stage I flash, and it was only from 1st to 2nd gear change.. but after HFC and Stage II, that went away. Its very smooth at any level..

[dracolnyte]

I experience a very similar jerking that you speak of; it is normal!

I'm guessing you have the S-tronic gearbox - these dual clutch systems react very similar to a MT.
When you are moving at such low speed as you mention, the clutch is completely intact.

For those of you who have driven a MT, you would experience the same feeling if you were to speed up to about 10 mph, release your feet from the pedals and let the car slow down independently.

Nothing to worry about imo

no we have the tiptronic which has a torque converter