RPM surging?

[akinaboy]

wow..first time seeing this happens on MT. Does it happen while going up on hill?

[A4rooster]

Yes, it happens anytime you increase the throttle gently. You probably will never feel it if you accelerate like a bat out 'o hell. It's quite noticeable when you are just cruising and gently want to increase your speed. It's just like you have a tank of bad gas (water) or dirty injectors. There is a pretty solid power "suck" just before 3000 rpm but the other "glitches" are all over the RPM range. This is NOT a transmission problem! Seems like an engine throttle mapping issue or perhaps something with the exhaust valvelift. Hate the fact that the service departments normal response is always, "there's nothing wrong". I bet they'd have a different response if it was their car.

I'm really disappointed that the 2nd year of this model still has so many issues. I always skip the first year of a new model.

[akinaboy]

Yes, it happens anytime you increase the throttle gently. You probably will never feel it if you accelerate like a bat out 'o hell. It's quite noticeable when you are just cruising and gently want to increase your speed. It's just like you have a tank of bad gas (water) or dirty injectors. There is a pretty solid power "suck" just before 3000 rpm but the other "glitches" are all over the RPM range. This is NOT a transmission problem! Seems like an engine throttle mapping issue or perhaps something with the exhaust valvelift. Hate the fact that the service departments normal response is always, "there's nothing wrong". I bet they'd have a different response if it was their car.

I'm really disappointed that the 2nd year of this model still has so many issues. I always skip the first year of a new model.

Sounds just like what I have gone through.
Go to the dealer with the TSB#: 2021227/1; ECM Update

If the dealer still refuses to fix anything by saying 'nothing was wrong', call AofA customer service and complain to them. Since they have very good customer service, someone from your dealer will call you probably within 2 days.
After that and tranny filter replacement, the RPM surging issue was gone on my car. But, it came back after having the vibration from steering wheel fixed.

[A4rooster]

yeah, I actually came prepared with that TSB and they tell me there is no TSB with that number. To add insult to injury, they washed the car and I ended up with two rims scratched.

I already have an issue open with AOA as when I took delivery of the car the driver's side flooded with water 3 days later. Faulty grommet installed in the firewall. Unbelievable!!

[akinaboy]

yeah, I actually came prepared with that TSB and they tell me there is no TSB with that number. To add insult to injury, they washed the car and I ended up with two rims scratched.

I already have an issue open with AOA as when I took delivery of the car the driver's side flooded with water 3 days later. Faulty grommet installed in the firewall. Unbelievable!!

wow.. try going to a different dealer.
The dealer I went to, gave me a horrible customer service and gave me a weird look and didn't care about the problem I explained to them.
Once I called AofA, the level of customer service was clearly different.
If they still give you a don't care attitude and refuse to give any further work on it, not sure what to tell you besides 1. compalin to the AofA more strongly or try going to a different delaer.

[A5MD]

I just noticed this on my 2010 A5 that I just got. So there are 2 updates? a ECU and Trans update?

[Hali Mark]

I'm experiencing this in my 2009 Avant and was wondering if anyone can provide exact info for the dealer fix. I have very little faith in my local dealer to recognize this as a software issue and properly update it. I don't think they have much experience fixing the B8s as both times I've had it there have been bad experiences.

TSB#: 2021227/1; ECM Update seems to be a fix for a different problem after reading on the Audiworld forums, a hesitation in the 3000-4000 range. What I have is a bouncing or pulsing rpm needle between 2400-2800rpm range. It make the car feel like it is surging back and forth. It seems to go away in Sport mode as others have said.

Thanks

[jordancl]

my 2010 6MT kinda stutters in 2nd from 2k-3k RPMs, is this a known related/similar issue?

[dracolnyte]

at first, i thought it was the restrictive exhaust causing turbulent airflow at the turbo... well i guess it really is the transmission

[rune]

Yes, it happens anytime you increase the throttle gently. You probably will never feel it if you accelerate like a bat out 'o hell. It's quite noticeable when you are just cruising and gently want to increase your speed. It's just like you have a tank of bad gas (water) or dirty injectors. There is a pretty solid power "suck" just before 3000 rpm but the other "glitches" are all over the RPM range. This is NOT a transmission problem! Seems like an engine throttle mapping issue or perhaps something with the exhaust valvelift. Hate the fact that the service departments normal response is always, "there's nothing wrong". I bet they'd have a different response if it was their car.

I'm really disappointed that the 2nd year of this model still has so many issues. I always skip the first year of a new model.

I have the same problem like you describe. I have got new software in tiptronic gearbox and changed oil and filter but it's still the same.I feel it when the car is warming up,and goes away when heated up.My RPM has variation like one mark up/down.No error codes in ECU.

It's a long time this thread is been active,so i hope someone has a solution and tell me ?

[latintrpt]

I have the same problem too. I have a 2010 Audi A5 2.0T /6Spd Manual
I have APR Stage II, AWE FMIC, AWE Exhaust, AWE downpipe, EuroCode HFC, and APR cold air intake.

With the APR cold air intake, I can actually hear the problem. I hear like a wooshing sound, I know that's the turbo, but it isn't continous, it pauses, then wooshes, pauses, then wooshes. It's very strange. Anyone have a solution?

[rune]

I have the same problem too. I have a 2010 Audi A5 2.0T /6Spd Manual
I have APR Stage II, AWE FMIC, AWE Exhaust, AWE downpipe, EuroCode HFC, and APR cold air intake.

With the APR cold air intake, I can actually hear the problem. I hear like a wooshing sound, I know that's the turbo, but it isn't continous, it pauses, then wooshes, pauses, then wooshes. It's very strange. Anyone have a solution?

Search for diverter valve,PCV or EGR valves ! see what you find here. I think i have read about this somewhere.
Good luck

Somebody found out about the RPM surging/variation/fluctuation ?

[gotquattro]

Apologies for raising the dead....

There are a few folks in my adopted Mazdaspeed6 world who have recently started suffering a very similar set of symptoms to the surging described in this thread. The manual trans variant.

Thought I'd use my account here to ask if there was ever a resolution to this problem that satisfied everybody, or perhaps some additional information you might point out?


Thanks, and again, sorry for the necro-bump....

[SilverSurfer_A4]

Try cleaning you throttle body out take the intake hose from throttle body open your butterfly spray the throttle body and ur rag with Carb/throttlebody cleaner and while out and carbon buildup I've seen them get stuffed pretty good and starts the surging you can then spray it while its running also spray some around the intake and check for leaks

Sent from my LG-P999 using Tapatalk 2

[UmIsThisThingOn]

It seems I have a variation of this. If I'm in 1st or 2nd it's fine, but 3rd and above I have an RPM surging issue.
Anytime I hit the throttle more than normal throttle, it surges and all of a sudden I'm going fast...

If I'm in Cruise Control and I try to accelerate, it takes the car out of CC, the shift indicator on the DIS disappears kind of like when I'm shifting gears (6MT). It kind of feels like a slipping clutch or air/fuel issue.

I checked the usual suspects; MAF, Turbo Hose, Intake Manifold Hose. I'm going to VCDS scan hopefully today.
Anyone have any other suggestions what it could be? The only thing I can think of now is the dreaded 'Intake Manifold' issue.

[SDF1]

I have an 2009 A4 2.0T 6speed automatic and I have the same issue. From 2300-3000 it revs super quick but get's boggled down at 3100pm. Doesn't do it in tiptronic mode.

So you guys have had this solved by having them change the transmission filter? Was that after doing a test to make sure there is no foam in the transmission or they just did it?

[JagStyles]

Reviving an old thread here but I have a 2010 Audi A4 with the exact same issue about fluctuating RPM's between the 2300-2800 RPM's when holding the throttle steady to accelerate at a constant rate. Was there ever a solution for this? ie: ECM Update for 2010 models to rectify the issue?

[wyld]

Reviving an old thread here but I have a 2010 Audi A4 with the exact same issue about fluctuating RPM's between the 2300-2800 RPM's when holding the throttle steady to accelerate at a constant rate. Was there ever a solution for this? ie: ECM Update for 2010 models to rectify the issue?

I'm still having this issue also. Some people had software update fix it but mine seems to have come back in the past few months.

[Tenedorr]

Necro-bump. Haha love it. Yeah so anyway I have a 2007 A4 that does the same thing, anybody wanna share what the cure was? Transmission filter? ECU update?

[Mussa]

Exact same problem as well. After apr stage 1 v2.0 tune it began. Surges around 2500-3000 rpm when accelerating moderately. No problem at WOT.

Any one solved this issue?

[DaPlatypus]

Bringing this back from the dead. Have this issue with a 2010 A4 Avant, 6spd Auto. Changed plugs, coils, did a transmission fluid & filter change. Audi dealer couldn't find anything wrong with the car... Has anyone found a solution to this?

[rcprato]

Interesting this thread popped up because my 09 Avant does this, thought maybe it was s lose waste gate on turbo maybe but don’t hear it rattling.
There is a sensor in inlet hose on driver side we’re it comes up from intercooler I was going to try cleaning, figured it couldn’t hurt anything.
Maybe someone has a solution?

[misiak]

I have a 2009 A4 2.0T manual, and I am experiencing something similar between 3000-3200. I have had the local dealer updated the software to the latest version, but I don't trust them at all. They have a sketchy track record. I will be doing some logging with VCDS soon to try and narrow down what could be causing this.

[DaPlatypus]

rcprato - I tested the waste gate and it seemed tight, also no rattling on my end as well. Performed a boost leak test and didn't find anything. Do you know what that sensor is for? Temp?

misiak - Keep us posted on what you find!

This surging sensation seems almost too similar to common B7 TC failures, although I'd like to believe this is not a transmission issue. For myself, its more common in D, although can still feel it in S & M under the right conditions.

[rcprato]

Do you have logged faults for Low Turbo Boost ? My MIL is not on but if I do a full VCDS scan I usually have that fault code logged as happened.
I don’t know what sensor is called but they monitor air flow I believe and there is another one in the intake. Have read posts about air leaking around sensor in manifold.
Wish I could put camera to watch waste gate actuator arm to see if during surge it moves back and forth because I think system calls for boost and then realizes it has what it is looking for ?
Must be a way to watch boost while driving with VAGCOM and just have to find time to do it

[DaPlatypus]

Do you have logged faults for Low Turbo Boost ? My MIL is not on but if I do a full VCDS scan I usually have that fault code logged as happened.
I don’t know what sensor is called but they monitor air flow I believe and there is another one in the intake. Have read posts about air leaking around sensor in manifold.
Wish I could put camera to watch waste gate actuator arm to see if during surge it moves back and forth because I think system calls for boost and then realizes it has what it is looking for ?
Must be a way to watch boost while driving with VAGCOM and just have to find time to do it

I have no faults logged. Interesting info on that sensor though, I'll have to take a look at it this weekend.

Do you hear an on and off whistle from the turbo during this surge? It sounds exactly like its dumping boost on and off.