Is it normal for RS5 to rev up automatically after a complete stop??

[shanelu2000]

Hi guys,
I find something interesting about my RS5. Its engine revs up automatically to 1500 rpm and hold for a few seconds after a complete stop sometimes. It only happens when the A/C is on. I went to dealer and they told me that this is normal because the engine revs up to compensate the power loss when the compressor kicks in. It really feels uncomfortable when I hit the throttle if the engine is revving up. It feels like a small launch control.
Do your RS5 perform the same way??I really don't think this is how RS5 is designed to be. I am even thinking of trading it in for an AMG these days.LoL
I'd really appreciate it if you guys could tell me where the problem is.

youtube link:
https://www.youtube.com/watch?v=tr-sl7oEAyI

[Zee Dgerman]

I've never noticed that

[shanelu2000]

That's quite annoying, the guy at the dealer keeps telling me that it is normal.

[Mops@Nemesis]

Eager pack. +$1,300 USD. Must have been a freebie.

[shanelu2000]

Eager pack. +$1,300 USD. Must have been a freebie.

????

[Zee Dgerman]

How much mileage do you have on the car?

That's quite annoying, the guy at the dealer keeps telling me that it is normal.

[chrissurfr]

thats not normal.....mine doesnt do that.

[shanelu2000]

How much mileage do you have on the car?

I have 8800 on it now....That automatic revving happened few days after I took delivery....would it be the faulty compressor???

[shanelu2000]

thats not normal.....mine doesnt do that.

I know...but the technician at the dealer told me it was normal...after 100 miles test drive.

[Zee Dgerman]

I have 8800 on it now....That automatic revving happened few days after I took delivery....would it be the faulty compressor???

I don't know, could you take a phone video of it? it does it while you have your foot on the brake?

[superswiss]

Does it actually drop first and then rev back up or do the revs just not drop all the way to idle immediately, but a little later? The A/C compressor stuff is balony. Not even the lowly rental cars I drive from time to time need to rev up to 1500 rpm to compensate for the A/C compressor and my RS5 certainly doesn't do that.

[John P.]

100 mile test drive? Sounds like your car gave the tech or manager a nice date car.

[shanelu2000]

I don't know, could you take a phone video of it? it does it while you have your foot on the brake?

yes, it does it while my foot is on the brake...I have a video about it ..I'll upload it later

[awhk82]

Same here on my RS4. This happens only when I put the car to a stop "gently", the rev holds and remains at around 1,200rpm for couple seconds before drops to idling (this doesn't happen every time though). Probably the gearbox expects me to accelerate the car again. Can be quite annoying at times. This never happened on my previous S5 Sportback with 3.0T + DSG.

[shanelu2000]

Does it actually drop first and then rev back up or do the revs just not drop all the way to idle immediately, but a little later? The A/C compressor stuff is balony. Not even the lowly rental cars I drive from time to time need to rev up to 1500 rpm to compensate for the A/C compressor and my RS5 certainly doesn't do that.

It drops first and rev back up and then hold for a while and it drops again..the car won't accelerate with the revving up....there are usually several harsh downshifts before this happens.

[shanelu2000]

Same here on my RS4. This happens only when I put the car to a stop "gently", the rev holds and remains at around 1,200rpm for couple seconds before drops to idling (this doesn't happen every time though). Probably the gearbox expects me to accelerate the car again. Can be quite annoying at times. This never happened on my previous S5 Sportback with 3.0T + DSG.

Exactly the same as mine. But mine revs up even when I step hard on the brake...lol..Do you think it's a problem with the car since most of RS owners don't have the automatic revving 4.2 V8 tho...

[rs5mikev]

Not normal. There is a sensor/computer that revs the engine at start up when cold. This is to heat up the cat converters. This was told to me by the dealer. You may have a problem with it.

[shanelu2000]

Not normal. There is a sensor/computer that revs the engine at start up when cold. This is to heat up the cat converters. This was told to me by the dealer. You may have a problem with it.

Thank you for ur info, I'll contact my dealer and ask them about it. Hope the problem can be solved...It's been disturbing me since it was delivered to me....a year already!

[shanelu2000]

100 mile test drive? Sounds like your car gave the tech or manager a nice date car.

Actually I asked them to test drive more to find where the problem is ==but I didn't seem to work....

[CoJoe]

Not normal. There is a sensor/computer that revs the engine at start up when cold. This is to heat up the cat converters. This was told to me by the dealer. You may have a problem with it.

My car does the occasional rev thing too. I think it's normal. The startup cat pre-warmer thing doesn't increase engine RPMs, it is a separate system with heaters and blowers, so I doubt it is related to that.

[bkw]

reminds me of my old 84 5000s

[shanelu2000]

My car does the occasional rev thing too. I think it's normal. The startup cat pre-warmer thing doesn't increase engine RPMs, it is a separate system with heaters and blowers, so I doubt it is related to that.

Mine only does that when the A/C is on......and it does this a lot....maybe twice every three stop signs....

[superswiss]

Same here on my RS4. This happens only when I put the car to a stop "gently", the rev holds and remains at around 1,200rpm for couple seconds before drops to idling (this doesn't happen every time though). Probably the gearbox expects me to accelerate the car again. Can be quite annoying at times. This never happened on my previous S5 Sportback with 3.0T + DSG.

This is why I was asking OP if it drops first and then revs up. What you describe is normal and has to do with emissions control. Dropping the revs too quickly in some situations causes a rich mixture. My V8 S4 did this, but I'm not noticing it as much on the RS5, maybe it's just because I'm so used to it by now. The OP's issue, though is different. Once the revs drop to idle they shouldn't increase back up. I've never observed this on my cars.

[bknewtype]

it means keep going, dont stop. why would u ever wanna stop when u have an rs???

[black2011silver]

Try to clean the MAF sensor. There's a spray specifically for this. I was told you can never clean it "too much". This might not be it, but worth spending a few bucks to see.

[shanelu2000]

Try to clean the MAF sensor. There's a spray specifically for this. I was told you can never clean it "too much". This might not be it, but worth spending a few bucks to see.

Thank you! I'll take it to dealer and ask them about this sensor..

[shanelu2000]

This is why I was asking OP if it drops first and then revs up. What you describe is normal and has to do with emissions control. Dropping the revs too quickly in some situations causes a rich mixture. My V8 S4 did this, but I'm not noticing it as much on the RS5, maybe it's just because I'm so used to it by now. The OP's issue, though is different. Once the revs drop to idle they shouldn't increase back up. I've never observed this on my cars.

Do you have any idea where the problem might be??

[shanelu2000]

it means keep going, dont stop. why would u ever wanna stop when u have an rs???

I hit red line on my way home just now

[banksc]

A/C? Bah! ...just open your windows.

Too keep it on topic: I have never noticed this behavior, but I have only used the A/C 3 times in the 6wks I have had the car.

[superswiss]

Do you have any idea where the problem might be??

No, sorry. Since I never ran into this issue, I don't know. Did you go on a test drive with the tech? If I read your original post correctly, it only happens intermittently. I suspect it's one of these cases where the tech says he can't reproduce the issue. You may wanna request to go on a test drive with the tech and show him the issue. If it does only happen with the A/C on, perhaps there is an issue with the compressor and it puts undue strain on the engine and the engine compensates to prevent stalling. How's your fuel economy? If it is something along these lines I would expect a poor fuel economy as well.

[shanelu2000]

No, sorry. Since I never ran into this issue, I don't know. Did you go on a test drive with the tech? If I read your original post correctly, it only happens intermittently. I suspect it's one of these cases where the tech says he can't reproduce the issue. You may wanna request to go on a test drive with the tech and show him the issue. If it does only happen with the A/C on, perhaps there is an issue with the compressor and it puts undue strain on the engine and the engine compensates to prevent stalling. How's your fuel economy? If it is something along these lines I would expect a poor fuel economy as well.

Fuel economy is quite bad....13mpg .....I gas it up every three days==..I think I'll have to test drive with tech to find out what is going wrong...

[gijsv]

Ok, it's an old topic. But is there a solution for this problem? Or is this a normal behavior?
I own a 2012 RS4 with 20.000KM

[KmorgsRS5]

I just got my car back from 25,000 miles service. Since i've had the car back i have noticed it randomly goes into some type of high idle ( goes to about 950rpm up from idle ) It does this with ac on or off and when the car is cold or warmed up. Never have i had my cars RPM's go that high, sounds to me like something is off.

[Got No Game]

I've never noticed that. Does not sound normal to me. Sounds like idle adjustment is off.

[CoJoe]

I've had it happen a very sporadically. It also coincides sometimes with the dead pedal thing where the gas pedal doesn't respond for like 30 seconds. I have to pump the pedal a couple times before the trans and engine figure things out, then it goes back to normal. very infrequent, but disconcerting when it happens.

Just had another thought. I just sold the RS5 and got an S7, same transmission, different engine. Wonder it will ever happen with the new car? I'll post if it does... but might be a couple months.

[gijsv]

The dead pedal syndrome accured 2 times now. Anyone familiar with this problem?
I already made an appointment at the dealer...

[gijsv]

Who can help me?
The dealer searched their information bulletin and found a familiar problem. A software update should solve it, but the software update had no effect... It stil happens sometimes.

[danidoza7]

I have recently came across this issue immediately after I had my heater core replaced. My RPM's would rev up to 2000-2100 RPM's on a dead stop and would not allow me to move forward until the idle came back down normal. Mind you, it would rev up and stay up at 2000 (plus) RPM's for a good 3 seconds, or so, and then find its way to idling down.

I took the car back to Audi where they performed a software update. Initially, this did nothing and the problem was still there. The next day I took the car back the dealer, where they kept the car for a few days and performed a series of test, but found nothing. While they were running these various test and checking everything thought possible, they were also awaiting a new software from Audi (Germany) who sent them two different forms of software updates. One was for the ECM (idle up issue) and the other was for DSG Temp Sensor. I would randomly feel like my gas pedal would black out and not want to accelerate on command. This issue would present itself once in a while, but I knew this wasn't normal either.

After the software updates, my RS5 felt like they tuned it with some sort of APR type tune. The gears literally shift with so much more precision and quickness that even in comfort mode, you feel the difference on the acceleration. I guess if I had to explain it best, the car feels like it has so much more torque. The throttle response is through the roof and I personally could not be happier. I would strongly suggest you all to push your dealer to find a solution, especially if they tell you that this is normal. IT NOT NORMAL, trust me.

If a software update does not solve your issue, then you may want to look at these note below. I was given this information from a friend who's issue wasn't a software update and was his crank case ventilation valves. I hope this information solves your problems.


Just check the crank case ventilation valves next to the throttle bodies. I had a diaphragm fail in one and did create an idle up issue. Not as bad as yours though.

It's not normal. The idle up was minor on mine until the diaphragm on one of the crank case ventilation valves let go. It then idled up quite a lot as it was sucking from atmosphere. These valve numbers are no superceded. I now now why.

But I would check if you can here them sucking at idle and by putting your finger over the vent on the back of the valve to see if it is sucking your finger.

The other thing might be that a vacuum leak will upset the throttle position. Which is why the car doesn't move at that high idle speed because the throttle position is reading 0%

[djnuge]

Has anyone found a resolution to this problem?

[Durin]

Has anyone found a resolution to this problem?

Yes

But I think the heater core 2000rpm is different

If you’re talking about an increase to about 1200-1400rpm for a couple of seconds when you stop in an RS5 then it appears likely to be battery related

This has been confirmed to resolve the issue on numerous occasions although obviously it’s not 100% your issue

Unless you are confident your battery is very healthy I would suggest replacing your battery