01 1.8T few issues

[fivepointnine]

The biggest issue I have on a recent bought A3 1.8T is the engine idles poorly (sputters and hunts for idle, has not died on me though) when warm, idles perfectly and very smooth in high idle when cold. Seems to boost good, engine is very quiet, NO EML. I found the Y hose off the valve cover pretty much disintegrated (a 2" at least exposed hole) So I am hoping this fixes the idle problem.

Second problem is the temp gauge never moved off of 60 (well one time I started the car it showed just below 90 but dropped down right away) Im going to replace the temp sensor tomorrow, but Im afraid this one might be a stuck open thermostat.

Third problem which I am not sure of is that the rear washer does not work, you can hear it turning on when you move the stalk but no fluid comes out, front washers work perfect.

Fourth issue is the front speakers on the bose system are completely wasted, has anyone found a direct fit replacement?

Any help or suggestions on the above issues would be appreciated!

[fivepointnine]

Ordered the vacuum hose from the Audi dealer today, it will be in Wednesday morning as well as the coolant temp sensor. I tested tonight by running the car with the hose as is and it started to stumble on idle very badly after about 30 seconds of idling, then I took a plastic bag and tore it up in strips and wrapped around the hole as best as I could, then restarted, the car actually held and idle, still not totally smooth, but enough that it would be derivable. So I hope that hose fixes my idle issues, when I go to get the cambelt done I will probably have them smoke check the vacuum system to make sure there are no other leaks.

Still looking for more info or answers though!

[Crasher]

You may find the plastic hose from the Y hose and the T piece below that with the valve, the small hose out (the one with the arrow) and the plastic elbow pipe ALL need replacing as usually the whole lot drops to bits and will be part or all of your idle, there is only one way to find out. This is for an AUM code engine.



The temp problem will be the thermostat, no big deal.


The whole breather system has to be absolutely air tight (you can get away with a small air leak from the cam chain adjuster) and they only way to check this is with a pressure test or smoke system. Ignore the arrow pointing to the throttle body.

[fivepointnine]

You may find the plastic hose from the Y hose and the T piece below that with the valve, the small hose out (the one with the arrow) and the plastic elbow pipe ALL need replacing as usually the whole lot drops to bits and will be part or all of your idle, there is only one way to find out. This is for an AUM code engine.



The temp problem will be the thermostat, no big deal.


The whole breather system has to be absolutely air tight (you can get away with a small air leak from the cam chain adjuster) and they only way to check this is with a pressure test or smoke system. Ignore the arrow pointing to the throttle body.

You think I am on the right path looking at the breather system since I don't have a MIL? I did confirm it is a AUM engine code. I tried idling it again tonight without the plastic wrapped around the hose and it would barely run, of course that hose is pretty much completely torn in two now from me messing with it, so the engine is seeing a TON of un-metered air entering.

Also do you need to remove the manifold to get to that t-fitting and associated hoses?

And a final question, is there a trick to the Audi hose clamps?

[Crasher]

You need to remove the front solenoid tray and tilt it over out of the way after disconnecting the secondary air injection hose from the bolt in the centre of the tray. Then you can just get you hands down to the top of the oil filter houisng breather outlet and remove the old bits. You will probably find that the bottom of the 90 degree plastic pipe will snap off leaving a brass coloured metal ring and plastic plus the O ring in there which you will have to dig out without dropping all the bits into the breather. Just because you have no MIL does not mean you do not have any relevant fault codes. A friend of mine borrowed my pressure tester a few years ago to sort out his poor idling on an AUM engined Octavia L&K auto (stalling auto's are a pain) and he nearly lost the plot after a few days. He ended up replacing all the vacuum pipe system, breather system, injector and seat seals and the VVT unit and gasket.

This can get expensive, all the parts for the breather system alone come to over £170 and all the front hoses around £190 plus the throttle body will need cleaning and re-matching to the ECU. Even then you could have other faults, this is why a fault code read and leak test is so important.

[fivepointnine]

Yeah Im replacing the top destroyed hose and the thermostat in the next 2 days to get the car driveable again,then next week I am going to just order an entire silicone hose kit and intake manifold gasket (and those two valves), replace it all and be done with it. Then I have to start looking at doing the cambelt, tensioner and water pump again as its due from age, not mileage. Then finally replace the front control arms/ball joints, then the car should be 100% again. I hate it when people lapse on maintenance. (but I got the car for a good price and it drove very well until that hose split too much)

[Crasher]

I don't know of a silicon hose kit that will do all of this, the two rigid pipes on the breather will have to be bought genuine and the hoses on the outside won't be included. I had a bit of a struggle with these on a BAM 2 litre I did last year, the main intake hose did not want to fit.

[fivepointnine]

I was going to get these hoses, along with those rigid elbows/tees and the associated valves Breather Hoses for Audi, VW, SEAT, and Skoda 1.8T 150/180 HP Engines | Forge Motor Sport I High Quality Motor Sport Parts

Think I had a bit of a split here! Im pretty sure that was allowing enough unmetered air into the engine to muck everything up!

[Crasher]

That kit is nowhere near enough what you will need, not even 25% of it if even that! You can't deal with all the variations so simply, it ain't a Poxhall! Yes that split Y hose would cause havoc with a closed circuit breather system engine but the AUM/AUQ engine series is super sensitive to crankcase ventilation system air leaks, it MUST draw only the air allowed in by the system intake, anything more is instantly detected by the Air Mass Meter and Manifold Absolute Pressure sensor signal inputs into the ECU.

[fivepointnine]

So do you think I have an issue besides that destroyed breather hose or should I start with that? The part is supposed to be in tomorrow morning early at the Audi parts department. I tried to feel around as best I could all the hoses/connections under/around the manifold and the air intake tract and could not feel any obvious splits or deteriorated hoses (not saying there aren't any!) What are the obvious suspects besides the t fitting below the manifold? Also is the breather and crank vent systems interconnected or separate (or an interchangeable term)? Im coming from vehicles with a much simpler breather /crank breather system (T7 B204R Saab being the next most complicated I have dealt with, my BMW is absolutely simple in comparison to both!)