Hi All, firstly great forum , secondly appologies for the duplicate post as I posted earlier in the more generalised RS talk area of this forum, hopefully i'm in the right area now!- have been having a read through previous posts but can't find anything specific to the issue that has just developed with my recently aquired RS6. Hopefully someone might have some experience or advice on the matter.
Have had the rs6 for a couple of weeks and it's been running superbly well, a seriously quick and addictive bit of kit. Some background on the car ;It has been remapped to over 500 bhp, has had both the turbos and intercoolers replaced within the last 15k miles and has a full service history. It also a miltek exhaust fitted with race cats.
So had a great drive the other day and let it cool down after the run for 10 mins before turning off etc. Then when I went to lock the car it wouldn't communicate with the key fob (i'm sure this is entirely unrelated but thought I would mention it just in case!), so left unlocked and then returned to lock later where it locked first time off the remote.
The next morning drove the car a short journey and noticed it wasn't performing, both turbos not cutting in and engine seemed down on power even for natural aspiration. I nursed it to my local VW specialist, who advised it was in limp home mode. They ran a scan and it came back with a lots of codes relating to the exhaust/cats which I assume is probably just a by-product of the aftermarket exhaust and cats?
One code for a speed sensor which was a known intermittent fault which would sometimes put the abs and traction control light on the dash.
So left car with the vw specialist (who have limited experience of working with rs6) and they phoned to advise that "the right bank of the engine is not drawing in any air" apparently they have ruled out the MAF by disconnecting and taking readings.
They suggested it might be a blockage in the inlet manifold , does this sound plausible as this is apparently a big job to remove and check. The mechanic wondered if these vehicles had any bmw style "swirl flaps" fitted which might have dislodged to cause the issue?
Does anyone know of any other issue which might cause the symptom of no airflow on one side of the engine (right).
I am obviously going to need to get the car to a specialist but in the mean time if anyone can suggest some basic checks I might get the garage to perform this would be great!! I was hoping it might have been a disconnected turbo pipe or similar!
Many thanks for any help in advance
Fraz
RS6 C5 New Onwer FON - Car gone into Limp Mode
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
I'm always amazed how many people buy an RS6 and have it go bang a week or two layer. I guess the previous owner had an inkling that it was about to lunch itself and put it up for sale.
What you've got does sound a lot like the problem Imola Sid had. I can't remember exactly what it was that happened to his, but I think a bit of manifold came off and lunched his turbo. Pretty nasty one, and rare, too.
You need to know what the air flow is at idle and under load. And what the ECU is asking for in terms of boost and what it's actually making. Did you get a print out of the fault codes? I suspect they are unrelated, though.
FON.
What you've got does sound a lot like the problem Imola Sid had. I can't remember exactly what it was that happened to his, but I think a bit of manifold came off and lunched his turbo. Pretty nasty one, and rare, too.
You need to know what the air flow is at idle and under load. And what the ECU is asking for in terms of boost and what it's actually making. Did you get a print out of the fault codes? I suspect they are unrelated, though.
FON.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
I think in this case the best thing you can do load the car onto a transporter and send it to Unit 20 or MRC.
May be a arse but you won't end up paying twice.
May be a arse but you won't end up paying twice.
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
As Shop says sounds like the exhaust manifold has broken up and mullered the turbo, Grizz showed me one when i was up there recently, sounds like this is becoming a common problem these days 
Avus Avant, RNS-E mk2 with sds and Bluetooth, Milltek, Hotchkis, Bilstein, Forge, ITG, A.C.E, Wagner, FBMFSW, MTM.
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Ok thanks very much for the replies guys. Was hoping it might be something less dramatic, didn't notice any strange noises or smoke prior to the incident. Do you think it's a definite no no to drive it gently to the specialist? I dread to think how much this is going to cost to rectify!
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Try and get a positive diagnostic first. The air flow logs and other logs will help with that. It's never advisable to drive with a suspected problem, but if it's the manifold then the damage I'd already done.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Do you have any kind of Vagcom / VCDS lite available? If not, get yourself to ebay and spend $5 on a KKL cable and download VCDS lite. This will make diagnosis over the internet a whole lot easier 
When they say the bank is drawing no air, do they mean absolutely none? Even with one bank not producing boost, the other should compensate and it doesn't sound like this is the root cause.
Where you based?
When they say the bank is drawing no air, do they mean absolutely none? Even with one bank not producing boost, the other should compensate and it doesn't sound like this is the root cause.
Where you based?
Recycling dinosaurs for fun
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Hi Thanks for the replies.I will speak to the garage tomorrow and post back the readings. Will also invest in that cable you mention, altho not great with computers! I'm based in Cirencester. Cheers Fraz
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
R18 GTX Estate > Saphire 2.0i Ghia > R19 16v > Vectra V6 SRi > M3 > RS6 Avant
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
The 5 quid cable is the cheapest thing you'll ever buy for the car 
The software you'll need is at the link below. It's not quite as good as the full blown VCDS, but given its 250 quid cheaper, it's not bad...
Ask the garage for all the codes out the engine ECU and the MAF readings at idle & 4000 RPM if they can give you them.
http://www.ross-tech.com/vcds-lite/download/
The software you'll need is at the link below. It's not quite as good as the full blown VCDS, but given its 250 quid cheaper, it's not bad...Ask the garage for all the codes out the engine ECU and the MAF readings at idle & 4000 RPM if they can give you them.
http://www.ross-tech.com/vcds-lite/download/
Recycling dinosaurs for fun
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Once again many thanks for the direction on what questions to ask garage , equipment to invest in and also the kind offer of the diags. I'm going to get some more specific feedback this morning and will post back . cheers FRaz
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
the codes at last, miltek system fitted with race cats so I assume the last 3 are related to that?
16885 - po501 veh speed senser (abs)
17861 - ex gas temp senser p1453
16814 - cat system bank 2 po430
17866 - ex gas temp senser 2 p1458
16885 - po501 veh speed senser (abs)
17861 - ex gas temp senser p1453
16814 - cat system bank 2 po430
17866 - ex gas temp senser 2 p1458
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
No, only the last but one code.
The EGT are vital to getting the mixture right. Might be putting the car in limp. The real test is in the logging. Air flow and requested /achieved boost will tell you what's what. Take up someone's offer of helping you out with a Vagcom.
The EGT are vital to getting the mixture right. Might be putting the car in limp. The real test is in the logging. Air flow and requested /achieved boost will tell you what's what. Take up someone's offer of helping you out with a Vagcom.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
thanks for the reply shoppinit the codes posted are from Vagcom and i asked the garage to get the reading at idle and 4k but apparently the righthand bank has no readings at all at idle or 4k ?! assuming they are checking correctly. One specialist I spoke to on the phone stated that if the right hand bank was drawing absolutley no air then it wouldn't be possible to even start the car? (car starts and runs) is this correct? thanks again for your help.
Re: RS6 C5 New Onwer FON - Car gone into Limp Mode
Sid's was pulling air at idle but not under load from one MAF.
Don't know what specialist you spoke to, but the car will start and run even if one of the MAFs is reading zero.
You need to know if the car is asking for boost or not. If it's asking for boost and not getting it, combined with the MAF reading zero then you've definitely got at the very least a seized turbo.
If the car's not asking for boost then we'll take it from there.
Don't know what specialist you spoke to, but the car will start and run even if one of the MAFs is reading zero.
You need to know if the car is asking for boost or not. If it's asking for boost and not getting it, combined with the MAF reading zero then you've definitely got at the very least a seized turbo.
If the car's not asking for boost then we'll take it from there.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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