Urgent help needed - 2.0tfsi revs going up and down on their own?

[medvwb6]

hey everyone, on my way out to my gf's, about 2 mins from her house the car revs started going up & down on its own, i didn't take much notice at first until i got round the corner - the revs started going up higher and higher, started to get really worried i turned the engine off.

I've got a 2.0tfsi 2006. No warning lights.

I tried again, turned the engine on and it was going up and down - then again, started going up by its self.

I've tried disconnecting the battery, i.e. partially resetting the ecu but with no joy.

I am really worried to drive the car to work tomorrow so any of you late sleepers who can reply i would really appreciate any help.

Many thanks.

[Crasher]

Start with a fault code read, anything else is risky guesswork.

[towcestervag]

as crasher says read fault codes
but also check the breather on front of cylinder head
try to take off oil filler cap when car is running and if it trys to suck it back on then breather is shot

[medvwb6]

hey guys, good afternoon.

ok, these are the codes that RAC have brought up:

P0234 - Turbo Overboost condition. Upper limit exceeded - intermittent
P1317 - No Info
P0642 - Sensor reference voltage "A" circuit low - signal too small intermittent
P1093 - Bank 1 fuel measure system 2 malfunction - signal not plausbile intermittent
P1602 - Voltage supply low (30) signal too small - intermittent
P0507 - Idle air control system RPM Higher than expected - upper limit exceeded intermittent.

Have had no engine warning light come on either, the cars been in my local garage and they have checked for air leaks, infact spent have a day looking around the engine and couldn't find anything. I told them about the breather and they mentioned its fine.

I've had the car re-mapped about 2 months ago but would this be a problem? even for reading codes. The company i had it done with are willing to come down and check for faults with their software which is a good thing but they said try everything else first.

One thing i have noticed as soon as the revs are playing up is a noise when i turn the engine off, as i take the key out and the engine turns off just before it stops there is a sort of shaking noise, like its off a mount or something or a chuggeling noise....(ive never used that word before and not even sure if it makes sense lol!)....could this have anything to do with it?

Also, they have tested the throttle body and it is ok.

Do i need a smoke test? If so, where can i get one done..I'm in London.

Thanks in advance guys.

[towcestervag]

those fault codes sound like breather on cylinder head
had same symtons on gti edition 30 took a while to find
the other fault was for pressure drop on throttle body

[Crasher]

I agree, sounds very much like the cam cover breather unit, cheap (£33.41) and easy to replace.

[medvwb6]

hi, thanks - its worth the risk of paying it....is this something that i can change? limited knowledge of engines but love to get my hands dirty, also where can i buy it? do eurocarparts do it or is a main dealer part?

the car runs fine when im in gear, some slight jerks and hesitation but just for a second.

if it is that then i have to say a massive thank you!!

[Crasher]

It is quite easy to get at and change but to help further I would need your cars engine type code.

[medvwb6]

Hi, sounding extremely silly - how do i find that? does it help if i say a 2006 2.0tfsi? lol

[Crasher]

It is on the inside cover of your service book, motor code...

[medvwb6]

Hi Crasher, good morning.

The only info i have in the service book is the chassis number?

[medvwb6]

Also, i've read that i could be a PCV issue? they are known to split inside....?

[Crasher]

PM me your chassis number.

[medvwb6]

have to add this to bring my posts up-to 10 so i can PM you.

[Crasher]

You have a BWA engine.

[medvwb6]

Hi Crasher, thank you!

Not sure if i mentioned or not i had a re-map done about 1 month ago...everything has been fine with it. I got in contact with them and they were extremely helpful, a technician that works there says he will put money on it being a Crank breather vent unit which i think is another termanology to what you guys said? anywho, i've ordered one from VW for £38.36 incl. vat with the gasket at £15.78, let's hope that will fix it.

My mechanic had also noticed today when he put the car on the ramp and started it first time being its cold out, from the cat down to the exhaust manifold it gets red hot, the actual pipes are red then after 10 minutes it cools down, what can be the cause of this? no other fault codes are being returned apart from the ones given earlier. Could this have something to do with the remap? Since this prob happened i've noticed a big decrease in mpg, for example driving it with the problem i was averaging 13mpg, before it was 20mpg odd in traffic.

Thank you in advance again.

[Crasher]

That is another symptom of a failed breather unit.

[medvwb6]

Hi Crasher,

Ok, i've had it changed with the gasket - there is a difference in idle but it still revs too high, sometimes gets stuck on 2,000rpm then drops back down. Its not 'Fluttering' anymore but on an open road if i put my foot down for example purposes in 3rd gear hit about 3,000rpm then let go of the pedal it will go a little higher on its own then come back down. But, when i go to pull off in first gear with just the clutch and no gas then it comes back down to normal under 1,000rpm. But there is an improvement in it, what do you think?

The other strange problem, when i turn the A/C on full the revs drop down to normal but then will return as soon as i start moving.

Thanks.

[medvwb6]

Could it be an EGR Valve?

[Crasher]

Can you get it fault code read again now the breather is working.

[medvwb6]

Hi Crasher,

I'll have to wait till tomorrow to get a fault code as the garage had to close early - ive ordered myself a vag-com for future ease. Although its not fluttering anymore but stays up on 2,000rpm randomly then drops again....should i go as far as to say it may be related to the cam follower? people have said i should be checking this and replacing it if there is wear.

I'm going to try the oil cap test to see for any leaks and leaving it off when the engines running, including leaving the dipstick out, i've heard its another way to check?

I know this must sound stupid, but is there ever a chance of the revs picking up and keep going up until i switch the engine off?

[medvwb6]

Another note,

Driving the car around for a while, i noticed when stationary and the revs being above 1,000, if i turn the A/C on full the revs come back down to complete normal! when i put it on econ mode the revs go back up...hmmm could this mean there may be a air leak somewhere in the A/C pipework? it also has a very slight hint of a squeel when turning it off and on (that may be normal)

So, with the a/c on i put my foot down pretty hard and i noticed hitting on about 3,500rpm there is a sort of 'Whoosh' noise, it's faint but definetely different to what it used to be before the idling problem occured. Also when changing gears the revs stay a little high after letting go of the pedal and i have very little jerking sometimes when letting the car slow down on its own.

The knocking noise is still there when i turn the engine off.

[medvwb6]

I am sure this will be the last addition to my posts below, i read about checking the oil cap for suction, and there was - the engine was sucking the cap back in which others said it 100% means i have a vacuum/air leak in the PCV...

Although i did change it today with a new one, i didnt change any breather hoses.

When the engine is running and i take the oil cap off, the engine goes back down to normal revs but sounds unhealthy.

I am sure i once had a code before they were reset with the system being too lean. This all matches up and i am sure will fix the issue.

I hope im onto something?

[medvwb6]

me again!

Could this be the problem? not that i can hear any air coming from it though. the pipe looks like its slightly come off but the o-ring is still holding it. Its at the bottom of the engine and i think its the main intake?

15243

[Crasher]

Not to clear a picture but if it is what I think it is, that could cause a big air leak.

[medvwb6]

hi crasher, thank you for your prompt reply.

i have changed x2 hoses on the new crankcase vent unit (pressure relief valve) but no joy.

i'll looked at all the pipes but one thing i noticed is a ticking noise, i've attached some pictures on another thread if you dont mind looking and letting me know what that is. When i fiddle around with it the revs drop but then come back up again.

Could a problem be a cracked brake vacuum pipe?

[Crasher]

The ticking noise could be the tank vent valve which is normal. I think you should get a fault code read done now.

[magic123]

sorry to jump on the post, i have a 56 plate 2.0 TFSI a3 quattro (http://www.amazon.co.uk/dp/B008BIGVII/) s-line last few days the car has been revving when im stationary and tonight sounded pretty lumpy, revs go up then down then up like im revving it (only to 1.5k near 2k max), have a vid if needed, seen this before on a thread but cant find it, aslo keeps flat spotting and then all of a sudden pulls at like 4.5/5k revvs dont know if this is linked? thanks

[Crasher]

That sounds like a failed cam cover breather unit but we need the engine code and you need to do a code read.

[magic123]

That sounds like a failed cam cover breather unit but we need the engine code and you need to do a code read.

thanks, will get it later, me being me why do you say that and not PCV for example? what is that called at audi? trying to get vagcom to plug it in, how do i check and where is it located? thankyou! (i am a girl btw) also car goes tsssshhhh when i lift clutch up from changing gear, may be DV?

[Crasher]

They are the same thing! Find us the cars engine code and we can help more directly but otherwise we have to guess what the engine is and that leaves us open to making a mistake, which I can't live with.

[magic123]

They are the same thing! Find us the cars engine code and we can help more directly but otherwise we have to guess what the engine is and that leaves us open to making a mistake, which I can't live with.

i didnt realise sorry like i said i am a girl and dont know the ins and outs, so basically the PCV then

[Crasher]

Yes, the part numbers change according to engine type code which will be AXW, BMB, BLY, BLX, BLR, BVY or BVZ.

[RichardSEL]

sorry to jump on the post, i have a 56 plate 2.0 TFSI a3 quattro (http://www.amazon.co.uk/dp/B008BIGVII/) s-line last few days the car has been revving when im stationary and tonight sounded pretty lumpy, revs go up then down then up like im revving it (only to 1.5k near 2k max), have a vid if needed, seen this before on a thread but cant find it, aslo keeps flat spotting and then all of a sudden pulls at like 4.5/5k revvs dont know if this is linked? thanks

Dunno where you are in Essex but there should be someone closer than me in SE London available to do a VCDS scan and see what's being reported. Have a look at:
VWAF User Location Map - VCDS - Google Maps (https://maps.google.co.uk/maps/ms?msid=209563024277134815192.0004c505be14b22419db e&msa=0&ll=56.231139,-2.779541&spn=3.493691,10.821533&iwloc=0004c505cfcb6158e0447)
I'm close to the Sun in the Sands roundabout off the A102 southbound

PCV (Positive Crankcase Ventilation) valves do get gunked up with oil solids. A sure fire way to check is to try removing your oil filler at idle. If you can't, then there's one indication. Another is to remove your dipstick and place you finger over the hole. If the suction tries to remove your fingerprint then there's another.

DV (Diverter Valve, not the same as PCV) faults show themselves by a hiss when you try and accelerate. And you have very flat acceleration

Your engine code is shown on a sticker in the spare wheel holder, or on a sticker on your service book first inside page

[magic123]

had this error come up, still idling rough, exhaust popping almost

1 Fault Found:
001287 - Idle Control System RPM: Higher than Expected. P0507 - 001 - Upper Limit Exceeded - Intermittent Freeze Frame: Fault Status: 00100001 Fault Priority: 0 Fault Frequency: 5 Mileage: 83438 km Time Indication: 0 Date: 2014.01.01 Time: 20:08:00

[RichardSEL]

had this error come up, still idling rough, exhaust popping almost

1 Fault Found:
001287 - Idle Control System RPM: Higher than Expected. P0507 - 001 - Upper Limit Exceeded - Intermittent Freeze Frame: Fault Status: 00100001 Fault Priority: 0 Fault Frequency: 5 Mileage: 83438 km Time Indication: 0 Date: 2014.01.01 Time: 20:08:00

16891/P0507/001287 - Ross-Tech Wiki (http://wiki.ross-tech.com/wiki/index.php/16891/P0507/001287)

What effects are there on oil filler cap and dipstick which I requested in my previous reply?

[Crasher]

Code 001287 is pretty conclusive that the cam cover breather has failed, it is the code recognised as signifying this, following any other path before changing the breather would be silly.