RS4 Issues - Anyone got a view?

[silverRS4]

2) Disconnect the CCV line back to the manifold - I doubt Audi will do that.

Wish it was that simple. You'd also then have to disconnect where the crankcase is drawing "in" air that's already passed through the mass air sensor. Then the crank case is free to ventilate is a fashion that's completely separate from the intake. However, the crankcase will then start to see positive pressure, relative to atmosphere, since the vacuum from the intake is now gone. This can affect gaskets (valve cover, oil pan, etc) in a bad way. In other words, this route can create more problems than it solves and the old saying "don't try this at home unless you know what you are doing" does apply..

[Housemaster]

have done several resets and a couple of engine management updates including a new 'lastest' update today I am told...

I wouldn't put it past Audi to tone down the sensitivity of the diagnostics to prevent the EML coming on (e.g. by increasing the operating parameters of what ever is to blame so it has greater tolerance) rather than actually fix the problem

I was already told that Audi might suggest this by my dealer. I told them to think again.

[Housemaster]

They have done several resets and a couple of engine management updates including a new 'lastest' update today I am told...

Other than installing new software and a new manifold, what else have they replaced?

I will dig out the details, but last time it was in it was 2 rear back boxes and an induction flap (sorry, don't have/know the exact element).

[SR71]

Silver,

Wish it was that simple. You'd also then have to disconnect where the crankcase is drawing "in" air that's already passed through the mass air sensor. Then the crank case is free to ventilate is a fashion that's completely separate from the intake. However, the crankcase will then start to see positive pressure, relative to atmosphere, since the vacuum from the intake is now gone.

I've been thinking about this. AntoRS4 measured a positive pressure delta over ambient in the inlet at WOT (see http://www.rs246.com/index.php?name=PNp ... e&start=15) so is it really a problem? i.e., there must be cases even in the stock configuration where the crankcase sees positive pressure anyway?

I freely admit I'm finding it hard to understand the relative pressures in the various components of CCV system especially as it looks like (on the basis there is a NRV in the line) they need to prevent reversal of the flow in some cases...

In principle I agree that "isolating" the system from the inlet is desirable.

[RS04COM]

Whatever the reasons are, I've had enough of driving around in a diesel-like petrol. I sent an email to Audi UK this morning at 09:49 and received a call at 09:55 from Audi UK Customer Services. Someone is going to call me tomorrow, ill update you guys with whatever happens.

[rsowneraudi]

if the fault codes being posted are for 'low flow secondary air' then there is a chance it could be the intake manifold causing this issue if it is coked up with oil

[reevesroadster]

FWIW, when the audi tech came out to me last week he identified a low flow secondary air, but confirmed the pump was still working. (You can check this by listening for a hoover type sound near the bulkhead when the ignition is on but the engine is not running).
The tech cleared the fault by resetting via the Audi diagnostics which involved some test where the car is allowed to idle for some time and the cats get really hot (600C+, and much hotter than they can get when driven normally). Ive checked for fault codes with VAG-COM since, and the fault has not reappered.
Sorry I dont have further techy info on the reset, I'll be happy to discuss with the dealer if required as the car is going in next week for the DRC.

[rs4jonesey]

hi guys myn is now playing up again.... wy did i buy this car. my fault codes are p2415 and the o2 sensor are reading fine on bank one sensor 1 and are reading on tick over lamba 1.007 but on lamba bank one sensor 2 it is reading 1.999 lean as hell.... also a nother fault code of p2679... unown what this one is? can anyone help???

AND WARRANTY RUNS OUT IN 2 DAYS great funnnnn!!!

[Contigo]

Get the car in to dealers before the warranty runs out as it will still be classed as in warranty when the fault occured. Good luck!

I must admit, the pleasure of owning an Audi is really starting to niggle what with this problem, the cams and DRC issues on the other RS models

[simonhill]

The problem of coking valves is beginnng to seriously worry me now - are all the FSI engines "timebombs" waiting to go wrong as the mileage creeps up?

[sonny]

FWIW, when the audi tech came out to me last week he identified a low flow secondary air, but confirmed the pump was still working. (You can check this by listening for a hoover type sound near the bulkhead when the ignition is on but the engine is not running).
The tech cleared the fault by resetting via the Audi diagnostics which involved some test where the car is allowed to idle for some time and the cats get really hot (600C+, and much hotter than they can get when driven normally). Ive checked for fault codes with VAG-COM since, and the fault has not reappered.
Sorry I dont have further techy info on the reset, I'll be happy to discuss with the dealer if required as the car is going in next week for the DRC.

Extend your warranty, obviously don't tell Audi nothing is wrong. I hear what you are saying, the problems with these cars is starting to put me off a little now!

[PetrolDave]

The problem of coking valves is beginnng to seriously worry me now - are all the FSI engines "timebombs" waiting to go wrong as the mileage creeps up?

IMHO it's not just a problem that will affect VAG FSI engines but will affect ALL direct injection engines from every manufacturer. The lack of fuel vapour in the inlet means that there is nothing to "wash off" deposits on the valves.

[P_G]

The question still remains though, how many cars has that particular problem affected to the point that the car developed a serious issue resulting in it not working and needing garage repair?

I haven't read the other forums regarding the 2.0 FSI engines however from what people have said it sounds like a handful? If that? Against how many FSI engines made?

[UNI555]

Before I bought an RS4 (recently) I read every road test I could find, as you do, and I read somehwere (think in an online Evo magazine test, where they ran one as a long-term car) that Audi designed the 4.2 FSI to do 155,000 miles without major work. Surely they would have bench tested, if not road tested the engine to high mileages before selling it? I mean, this is Audi, not TVR...or am I being naive?

[P_G]

Exactly, and how many people do over 155,000 miles in their cars nowadays, particularly in a performance model. APM's car is the highest mileage so far and most of that was JonP. Even at the mileage I do it is going to be another 6-7 years before I get anywhere near that mileage and if I still have my RS4 then it won't be my primary runner by then.