C7.5 APR tuned RS6/7 cyl5 misfire

[OOOO SSSS]

Hi,

Has anyone with c7.5 APR tuned RS6/7 had a misfire on cyl 5. I had it happen twice. I was hitting the kick down switch both times. It's happened 500miles apart. I'm confused as the car is fine otherwise.

Tx


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[HeelBuff]

Hi,

Has anyone with c7.5 APR tuned RS6/7 had a misfire on cyl 5. I had it happen twice. I was hitting the kick down switch both times. It's happened 500miles apart. I'm confused as the car is fine otherwise.

My RS7 is a C7, but when I was stage 1 I had this happen quite often, especially when I got on the car before it had time to reach optimal operating temperature. I just used the iPhone app to clear it and never suffered any adverse effects otherwise. Interestingly, ever since I have been stage 2 I haven't had any faults whatsoever.

[tonymission]

My RS7 is a C7, but when I was stage 1 I had this happen quite often, especially when I got on the car before it had time to reach optimal operating temperature. I just used the iPhone app to clear it and never suffered any adverse effects otherwise. Interestingly, ever since I have been stage 2 I haven't had any faults whatsoever.

Exactly. I used to get this every now and then if I switched to S mode right when it reached temp and then hammered it without giving it a little more time. Always in second gear she would hiccup.

[HeelBuff]

Exactly. I used to get this every now and then if I switched to S mode right when it reached temp and then hammered it without giving it a little more time. Always in second gear she would hiccup.

She never hiccupped in AMAX mode, though. Now that we know how lack of AMAX impacts timing between shifts it's not surprising we had the occasional misfire.

[OOOO SSSS]

The first time the car had the misfire, it just got to temp on a cold night. 2nd time was on the highway with the car fully up to temp.

Do we think it could possibly be caused by the cyl on demand. The cyl on demand shuts of cyl 2-3-5-8. If I had to think about it when this happened to me, I was always cruising and then wanted the power. Could it be that the car was about to engage cyl on demand and the Ecu was confused ?

@Tony ... Do you have a c7.5 mate ?


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[tonymission]

The first time the car had the misfire, it just got to temp on a cold night. 2nd time was on the highway with the car fully up to temp.

Do we think it could possibly be caused by the cyl on demand. The cyl on demand shuts of cyl 2-3-5-8. If I had to think about it when this happened to me, I was always cruising and then wanted the power. Could it be that the car was about to engage cyl on demand and the Ecu was confused ?

@Tony ... Do you have a c7.5 mate ?


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That's not a bad thought now that you mention it. I think one of my situations was similar to that.... steady, slow cruise and then demand for instant power.
I do have a 7.5 RS7, yes. :)

[ekpyr]

Edit: C7.5 here

YES. I was just researching this bit. I've gotten 3 misfires on cylinder 5 since I got tuned on 6/3. Found another thread before I saw this one... http://www.audizine.com/forum/showth...Feedback/page3 which references a cylinder 5 misfire from 2014.

IIRC, two times I got the misfire was shortly after coming to temp, where the lap timer read temps around 190. The third was 3/4 throttle in 5-6 gear, accelerating to pass.

Seems to be a pattern.

Here's VCDS logging of the first misfire:

2 Faults Found:
10203 - Random/Multiple Cylinder Misfire Detected
P0300 00 [032] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 16216 km
Date: 2016.06.11
Time: 20:44:07

Engine speed: 4720.00 /min
Normed load value: 32.9 %
Vehicle speed: 118 km/h
Coolant temperature: 74 °C
Intake air temperature: 47 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 13.570 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10595 - Cylinder 5
P0305 00 [032] - Misfire Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 16216 km
Date: 2016.06.11
Time: 20:44:07

Engine speed: 4720.00 /min
Normed load value: 32.9 %
Vehicle speed: 118 km/h
Coolant temperature: 74 °C
Intake air temperature: 47 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 13.570 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

Readiness: 0000 0000

Second/third:


2 Faults Found:
10203 - Random/Multiple Cylinder Misfire Detected
P0300 00 [172] - -
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 17677 km
Date: 2016.06.21
Time: 19:37:46

Engine speed: 5637.00 /min
Normed load value: 79.6 %
Vehicle speed: 140 km/h
Coolant temperature: 101 °C
Intake air temperature: 38 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 12.345 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10595 - Cylinder 5
P0305 00 [172] - Misfire Detected
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 17677 km
Date: 2016.06.21
Time: 19:37:46

Engine speed: 5637.00 /min
Normed load value: 79.6 %
Vehicle speed: 140 km/h
Coolant temperature: 101 °C
Intake air temperature: 38 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 12.345 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

Readiness: 0000 0000

[ekpyr]

I reached out to APR and shared this thread w/them. Will let you know if/what I hear back..

[OOOO SSSS]

Thanks

My codes on VCDS are the same.

I chatted to a UK c7.5 RS6 owner that has been tuned by a UK tuner. He says that his tuners deactivates cylinder on demand because of this issue that they have had.
Should we get a file from APR as such ? I'd be happy to test.

Last thing ... Could it be that spark plug gap has increased over time ? I am running NGK 7437-9 with the APR recommended gap. I fitted these about 2500 miles ago.


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[Sean@APR]

Thanks

My codes on VCDS are the same.

I chatted to a UK c7.5 RS6 owner that has been tuned by a UK tuner. He says that his tuners deactivates cylinder on demand because of this issue that they have had.
Should we get a file from APR as such ? I'd be happy to test.

Last thing ... Could it be that spark plug gap has increased over time ? I am running NGK 7437-9 with the APR recommended gap. I fitted these about 2500 miles ago.


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The information we have at the moment: The Cyl 5 misfire is temperature related and caused by a huge increase in load at low RPM. It's proven to be a nasty little bugger to track down. We have managed to duplicate it somewhat reliably, but we only get a couple tests per day because of it requiring the car to be cool.

We're conducting more tests on an S8 now, I'll let you know how that turns out.

[ekpyr]

The information we have at the moment: The Cyl 5 misfire is temperature related and caused by a huge increase in load at low RPM. It's proven to be a nasty little bugger to track down. We have managed to duplicate it somewhat reliably, but we only get a couple tests per day because of it requiring the car to be cool.

We're conducting more tests on an S8 now, I'll let you know how that turns out.

Sean thanks for the info.

To elaborate on my experience, if it helps:

Misfire #1. Engine was warm but not hot, having sat for maybe 3 hours. Pulled out from park and drove about 1/4 mile before pressing down, but not WOT. Got misfire as it approached 4K RPM.

Misfire #2. Engine was definitely hot after a canyon run. Running 100 octane file on 100 octane fuel. I think it was Sonoco SS100. Misfire happened on the cruise back home in a higher gear. I was accelerating to pass and got the misfire. Didn't notice it except for the CEL blinking.

Misfire #3. Engine warmed up to ~150 degrees after a short route. Accelerating was maybe 1/2 throttle, not WOT up a 10% grade hill in second from a stop. Hit about 5k RPM and engine misfired. This was a bad one as it felt like the car hit the brakes when it lost power.

I'm still on my trial so am happy to explore any options before its up. Knowing that there's attention to solve it and that it won't damage anything will help me decide to stay with the tune despite the problem.

Thanks.


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[OOOO SSSS]

The information we have at the moment: The Cyl 5 misfire is temperature related and caused by a huge increase in load at low RPM. It's proven to be a nasty little bugger to track down. We have managed to duplicate it somewhat reliably, but we only get a couple tests per day because of it requiring the car to be cool.

We're conducting more tests on an S8 now, I'll let you know how that turns out.

Thanks for sharing the info.


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[OOOO SSSS]

For what it's worth ... I got this off another forum




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[janthony6]

I'm having the same issue. My misfire occurred after getting the APR Stage 1. Both times oil temps were probably around 210-215 and I was in S mode. Both times I stepped on it and as it changed from 3rd to 4th or 4th to 5th engine power just dropped and I could feel the misfire.

Hopefully it's just a stage 1 problem that is fixed with the downpipes. Should be getting them installed Thursday.

[HeelBuff]

Hopefully it's just a stage 1 problem that is fixed with the downpipes. Should be getting them installed Thursday.

That's been my experience. Commonly had them while stage 1, haven't had one since I went stage 2 several months ago.

[ekpyr]

Did your CEL light flash? If not, that's traction control engaging when your wheel slips between gears. I've seen this happen when I'm on the throttle maybe 60-70%.

[ekpyr]

For what it's worth ... I got this off another forum




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Interesting. Thanks for sharing.

[pcgeek]

Any updates on this? I just had my second cylinder 5 misfire event in my C7.5 RS7 (Stage 1) and was hoping the gremlin had been sorted out. Pretty much same conditions as everyone else, under hard acceleration with both cold engine and cold temps. They were ~ a month apart so I'm not too concerned about it but it's a bit unnerving whenever it happens.

[Alister]

Sounds like a software update for the Engine ECU will be coming from Audi, which once released I assume will be updated/retuned by APR.

[kouzman]

I had a misfire code once. It was about 25 degrees outside, the car maybe 150 degrees on the oil and i gunned it in 3rd gear on a ramp! Very violent cutoff, probably a boost cut and the light went on...

I called it my fault and i never did it again... in most cases with subzero celcius temps, i am running the stock map. With the tune the car slides with all 4. Very scary! Lol!

About 7500 miles on the tune...

[goliath1]

Interesting. Thanks for sharing.

TD1 awaits

[BLACK-S6]

My 16' S6 Stage 1 with RocEuro Intake has a similar problem but never when the car is in auto or S. Only under one circumstance does it happen, no lights are triggered, no Fault Codes come up.
It happens in Second gear in M, if I floor it and shift at 4000-5000 without going through the entire gear, after the shift the car falls flat with almost no power until you let go of the pedal and hit it again. After logging the data using the dongle I found it was misfiring just for one second and then it would go back to normal as soon as I release the throttle and hit it again .
I called RocEuro because I noticed it after installing the intake. They said it is most likely an APR glitch and that the cars computer is expecting you to go through the entire gear instead of shifting early.
When any gear goes all the way to the shifting point and shifts or even just before but over 4000 rpm it will not do it. Didn't look into the temperature when it happens, I will pay attention to that. I know the head tech at my local dealer and he won't TD1 me but I will run it by him on my next service in about a month or two. Any one else experiencing this when shifting early?

[3rdBNCC]

Mine fell on it's face this morning while passing a farm bus and tractor on my way to work. Engine light flashed a few times and went back off. The oil temp was at 197 so that wasn't the issue. I had my iPad with me but no fault codes were listed. Curious why it happened, further down the road I jumped on it again. Smooth as silk and left off at 148 mph. First time though at temp this has happened to me.

[Arab]

Hi Gang,

Has this issue ever been rectified? My RS7 with stage 1 apr tune just starting doing this as the weather got cold. Not one issue all summer! grrr...did APR ever fix this? Is there a way to fix this?

[sWxdesigns]

I purchased the stage two on to my 2017 Audi rs7. Lokey Clearwater was told by me to gap my plugs from apr they said never heard of or done or seen on apr. I contact apr they tell em plugs ngk and 0.024 needed lokey says we didn't know. So they quote me 400 with new plugs I hobho ahead been a week now can't get on it without the dim light going on. Didn't have issue first two weeks. Now I am waiting the plugs to go in. But have 10 000 miles on my car so not happy . Buy the single to reset light and drive normal until installed. Not happy. They should have know to install cold plugs from getco . It started after fueling up and car hot and at 70mph hit now it does it all the time .
Wtf.
I also get a fuel something they go we never seen that .
I buy my single and app and see that they didn't a tivate valet 100104 and stock mode options so they said we will activate that. Feel like they really not know what they were doing installing my apr stage two but will see after I get my new plugs installed. They said apr to just regapp my stock plugs for now but I don't feel like retapping them and pay for since out might as well put new in. Glad to see I'm not only one with issue if I knew not sure I ever spent the 6k to do it . Frustrated with APR after great start new car then bad run out deal.

[allenzhang215]

I purchased the stage two on to my 2017 Audi rs7. Lokey Clearwater was told by me to gap my plugs from apr they said never heard of or done or seen on apr. I contact apr they tell em plugs ngk and 0.024 needed lokey says we didn't know. So they quote me 400 with new plugs I hobho ahead been a week now can't get on it without the dim light going on. Didn't have issue first two weeks. Now I am waiting the plugs to go in. But have 10 000 miles on my car so not happy . Buy the single to reset light and drive normal until installed. Not happy. They should have know to install cold plugs from getco . It started after fueling up and car hot and at 70mph hit now it does it all the time .
Wtf.
I also get a fuel something they go we never seen that .
I buy my single and app and see that they didn't a tivate valet 100104 and stock mode options so they said we will activate that. Feel like they really not know what they were doing installing my apr stage two but will see after I get my new plugs installed. They said apr to just regapp my stock plugs for now but I don't feel like retapping them and pay for since out might as well put new in. Glad to see I'm not only one with issue if I knew not sure I ever spent the 6k to do it . Frustrated with APR after great start new car then bad run out deal.

That is old issue at least for me. I did get misfire when it was cold before, after changing the spark plug, it minimizes the chance. But ultimately, it is software issue which has been already corrected. After installing the updated software, I did not have misfire anymore.

[sWxdesigns]

I hope it will get fixed after new plugs go in. I just start it now and apr Mobil app reads no fault codes now even when it comes on and I just start the car clear it still there and smell a lot of fuel . So I see fuel issue to now only 10k miles on car hope the plugs will solve it. Interesting enough started after I installed roc cold air intake not before that so unistalled roceuro and no difference hoes in to limp mode when hitting gas. But hot here now and humid in Florida not sure if that makes any difference to. Can’t wait to see effect of new Ngk plugs go in. Will update once new in

[sWxdesigns]

Got all new software uploaded again today and did it so hopefully just new plugs saw no fuel issue after reinstall of software

[kebabman]

Well my RS7 just started giving me the flashing CEL on kick-down and a cyl5 misfire code, APR stage 2. Happened 3 times now, all when temps are sub 30F. Car feels fine otherwise. Never had a problem all summer with many 1/4mile runs etc so I’m presuming it’s the same issue others have been seeing when the air temps get cold, but I only got my APR stage 2 this summer so shouldn’t I already have the fixed software?

My plugs are OEM and have less than 3k miles on them, but are OEM gap. I guess I could have them regapped but hate to spend the money for no reason. 🤔

[Nosferatu]

Still no clear cut answer from APR?

[kebabman]

Still no clear cut answer from APR?

Called them, they said there was a new update to address it as of 11/5/19, I’m currently at my APR dealer waiting for it (and CoD removal) to be installed. Will update the thread with if the update fixes it or not when I’ve had a chance to drive it around for a bit post-update.

[kebabman]

Annnnd it’s done. Apparently the 4.0T has now switched from v1.0 to V2.0 but they didn’t have any release notes so could only tell me that it “addresses the cylinder 5 issue”, not sure if anything else changed. Maybe Arin or someone can confirm.

So far so good anyway, drove 40mins home and no misfires so far. Also so nice not having the annoying CoD noise on the highway, won’t miss that!

[esemes]

Annnnd it’s done. Apparently the 4.0T has now switched from v1.0 to V2.0 but they didn’t have any release notes so could only tell me that it “addresses the cylinder 5 issue”, not sure if anything else changed. Maybe Arin or someone can confirm.

So far so good anyway, drove 40mins home and no misfires so far. Also so nice not having the annoying CoD noise on the highway, won’t miss that!

good to hear!! I'm going APR stage2 next month on my S6. (not using apr dwn pipes, but am using their tcu tune also). I am doing oem rs7 plugs gapped for APR specs on my car.

[NardoRS7]

Annnnd it’s done. Apparently the 4.0T has now switched from v1.0 to V2.0 but they didn’t have any release notes so could only tell me that it “addresses the cylinder 5 issue”, not sure if anything else changed. Maybe Arin or someone can confirm.

So far so good anyway, drove 40mins home and no misfires so far. Also so nice not having the annoying CoD noise on the highway, won’t miss that!

How can they not have release notes? Are current APR customers eligible for the free upgrade?

[kebabman]

How can they not have release notes? Are current APR customers eligible for the free upgrade?

My APR dealer didn’t have them is all I know. I paid $50 labor for the reflash.

[allenzhang215]

I think I had the version 2.0 long time ago, probably around September 2018 timeframe, which fix the misfire problem. They had updated stage 2 file even earlier.
Unless my dealer told me wrong about the version, I'm supprised to see you still have the old version