RS4's frog!

[Fullozteo]

I there,

no, there's no frog in the engine, only in the driver seat!

I'm new on the forum, so before talking about a big trouble on my 07 RS4 avant, i wanted to present myself.

I'm French, turning 39 in few days. Got my 07 RS4 since 02/13, the car has been De-coke by myself and the oil return system changed for a catch can, pre-cata out, remapped and air box valve taken out.

was happy with it until.... Blue smoke came out the left exhaust at idle!! And when i say smoke, i MEAN smooooke! Bluish and smelly, like oil. Nothing on the rigth side, and only at idle and warm. And oil consumption 1L/800km...

Went to my Audi dealer, had a complete change of the 32 valves with new seals, and a indepth cleanning of the top engine. Compressions was (i'm not certain here) taken before the motor out of the car and seemed to be ok.

After 4 months (yes, don't ask!! ) had the car back.... AND SMOKE STILL THERE ON LEFT EXHAUST!!

So, i'm suing them for the 7000€ for nothing, but i want my smoke probleme to be fixed!!

I want them to take compression again and want to change the rings...But will that solve the problem? No sure!! And why smoke only on one side!! nothing on the other one!

If someone had this trouble before, i'll take it! I'm getting nuts, can't use my car! HELP!!!

Another thing: the oil catch can il very often full, 50cl of muddy/oily/water liquid... Heard about guys having it clean and dry?? How can this be??

[RS4pete]

Could this be a faulty PCV valve?

[Fullozteo]

Could this be a faulty PCV valve?

Hi,

Actually, i took out the PCV!! there is no more return to the motor. That's the oil catch can taht does it.

I'm thinking about getting a return to the crankcase, as original. At the moment, the little return hose to the crankcase is plugged.

[Rick_RS4]

do you have a pic of your installed catch can, ? these have been fitted by numerous people including myself and nothing has been collected EVER, deeming them a waste of time, but as yours is always full it looks like your problem is somewhere round there like Dave said

[Fullozteo]

Hi,

here are some pics:

The modified oulet that comes from the top cams cover to the OCC


And the home made catch can: on the left entry, the hose from the cam cover, and the other one is a breather (there is a small air filter). bottom is a purge.






And all of this under the right cover (below the coolant tank).

have i done anything wrong???

And here is what i get after 1500km!

[Rick_RS4]

Well it seems to be working, however you have severely reduced the pipe diameter to the catch tank, have you ever started the car and felt the pressure of the outlet side on your hand? It's alot and that pushing through that small pipe you have made is not good, it will be building up pressure and most probably forcing the oil somewhere else, like down the valves causing the smoke.

Dis audi not say anything when thy saw it?

My catch can was 3 times the size and the pipework was the same size as factory

[Fullozteo]

Ahah! I was thinking about this. Audi told me it was ok, but i thought it was too small. Everybody thought the same around but audi.

I'll do a complete change of that piece, and let you know.

On the other hand, with knew stem seal, the problem should have been solved for a while no? The car smoked the day after. And why does it smoke only at idle after 2-3min? Never during acceleration.... Still possible that a ring is dead.

I'll work on the diameter problem a the same time. Thx.

[Rick_RS4]

Ahah! I was thinking about this. Audi told me it was ok, but i thought it was too small. Everybody thought the same around but audi.

I'll do a complete change of that piece, and let you know.

On the other hand, with knew stem seal, the problem should have been solved for a while no? The car smoked the day after. And why does it smoke only at idle after 2-3min? Never during acceleration.... Still possible that a ring is dead.

I'll work on the diameter problem a the same time. Thx.

Just remove it. It doesn't do anything, it might be forced somewhere else and if the pressure build up is that bad it will force it through, it will also take time to warm up and make hot oil vapour which will only form when your engine is getting hotter, no smoke on full throttle due to more gasses being pushed out the exhaust.

Take it off before you do anymore damage,

[jaysrs4]

I can't understand why you wouldn't of removed your DIY mod before spending 1000's of Euro's with Audi first?!!

That thing scream issues to me. I know the B7 Rs4 isn't renowned for having the best breather system in the world but it seems your mod may have made it worse??

The valves, pistons, rings and bores aren't know for wearing or having blow by even on high mileage ones.

As Rick has said, I'd remove your mod immediately.

[Fullozteo]

Hi,

I understand what you say, and will take it off and come back to normal.

BUT, seeing the original breathing system, I can assure you this one breath a lot better!! The diameter of the PCV is ridiculous, and have you ever try to blow into it???

That does not explain why there is a blue smoke ONLY on the Left bank (nothing at all right) and ONLY after minutes of idle not straight after stopping the car!! If you were 100% right, saying that this is the only issue to my smoke, the smoke would be very present, i would have a lack of power (dynoed it @412HP november 2013).

I still beleive there is another underlying problem, that the PCV removal has just shown up.

Thx for advice anyway, i appreciate and will definitly get rid off the OCC!! I'll let you know if smoke goes away or not!

[Rick_RS4]

Blow into what? The black oil separator in the back of the inlet manifold? It will be partly restrictive.due to the way it separates the oil and vapours,

412 bhp is good, a healthy rs4 gets about 390 ish