1.4 TSi Idle problems

[Boblell]

Have an MK6 5 door TSi (122) DSG. Lovely car and a complete pleasure to drive,except for one small problem. If I amwaiting at lights the idle speed can surge between 8 and 1.1. When I am driving slowly it can surge aheadand be quite jumpy, trying to park in a tight spot is dodgy when it decides togather revs on its own and surge forwards or backwards. At normal driving speeds there is no problem.

I took it to my local dealer for its first service about two monthsago and mentioned this issue. They told me that it needed a software update. Itseemed to cure the problem for a few days then it gradually came back, to thepoint now where it’s driving me to distraction again.

Any thoughts or advice would be most welcome. Thanks

[Guest 2]

If they are aware of the problem get it straight back.

[Boblell]

If they are aware of the problem get it straight back.

Thanks Chris, It’s a fault that can be intermittent, I havevisions of the car not playing up in their hands, only for it to reoccur when Ileave the garage. Wondered if it hadhappened to anyone else so I could be armed with a bit more knowledge beforetalking to them again

[webbcar]

Hello
My 1.4 TSI DSG 122 doesnt have your problem. It moves forward on its own. but that is normal.
But it does Pink / Ping when hot.
Cheers

[-M-]

There may be another underlying fault - if applicable there may be an idle adjustment available through guided fault finding.

[Boblell]

There may be another underlying fault - if applicable there may be an idle adjustment available through guided fault finding.


Yes, I must take it in and let them have another look at it, they think they cured it with a software update, but obviously not. Its fine when normal driving, its when your crawling in heavy traffic that it surges forwards or drops the revs! Most off putting! It's driving me nuts and I need to get it sorted!

[Crasher]

It sounds like your car has the 37E2 software update, if so this will be in your service book and on a sticker on the boot floor.

[Boblell]

It sounds like your car has the 37E2 software update, if so this will be in your service book and on a sticker on the boot floor.

OK, did that software update cause the problems then? The told me that had given it a software update at the service, but although it appeard OK for a few days it soon went back to how it is now!

I can see no mention of '37E2' on the boot floor or in the service book!

[Crasher]

They are supposed to put in the book a notification of software updates so I have no idea which of a number of updates they have done. You could ask them if 37E2 has been done or applies to your car.

[Boblell]

Well it went into the garage, left it for two days and the fault wasnt found. The worst possible senario for me. Started doing again almost straight away. Switched off air conditioning today and it hasnt done it again yet!! Maybe thats it? Had a look around the interweb and came up with something called 'compressor surge', but not enough to determine if that could be the cause. Just been out and checked my air filter, seems clean. I can see my only option is to get rid of the car! Took a video of it happening, although not as bad as it has been at times. Its here Golf MK6, 1.4Tsi surge - YouTube (https://www.youtube.com/watch?v=jnzuUYp2DDk) Held at lights, stationary, in DSG Drive, foot on brake.

Any thoughts gratefully received

[J400uk]

Only thing I can think of is sometimes in this sort of weather the idle when starting the car is circa 1200rpm instead of 700rpm, not sure if thats related

[Boblell]

Only thing I can think of is sometimes in this sort of weather the idle when starting the car is circa 1200rpm instead of 700rpm, not sure if thats related

Thanks for that, but its been for months now, not just in this weather. Just took it for a spin to replicate problem to see if it might be because the climate control is on or off. All worked perfectly today, the engine did pink a bit when climbing a hill and at one point I stopped on an upward hill, gear in drive, foot off everything, held for a few seconds then rolled back with not restraint at all, not sure if that is normal :-/

[mrzaima]

Well it went into the garage, left it for two days and the fault wasnt found. The worst possible senario for me. Started doing again almost straight away. Switched off air conditioning today and it hasnt done it again yet!! Maybe thats it? Had a look around the interweb and came up with something called 'compressor surge', but not enough to determine if that could be the cause. Just been out and checked my air filter, seems clean. I can see my only option is to get rid of the car! Took a video of it happening, although not as bad as it has been at times. Its here Golf MK6, 1.4Tsi surge - YouTube (https://www.youtube.com/watch?v=jnzuUYp2DDk) Held at lights, stationary, in DSG Drive, foot on brake.

Any thoughts gratefully received

I think i'm facing the same problem but the idle speed doesn't fluctuate like yours. Whenever the weather is hot and AC is on, specially on lights it rises from 680 to 920 rpm. Sometimes when i drive away and stop at next light it becomes normal then rises again if i keep for long. I wonder if you solved your problem, or was that normal for the car due to some sort of cooling action. I own a passat 2010 b6 with a 1.4 tsi engine with 7 dsg gearbox.

[Boblell]

I think i'm facing the same problem but the idle speed doesn't fluctuate like yours. Whenever the weather is hot and AC is on, specially on lights it rises from 680 to 920 rpm. Sometimes when i drive away and stop at next light it becomes normal then rises again if i keep for long. I wonder if you solved your problem, or was that normal for the car due to some sort of cooling action. I own a passat 2010 b6 with a 1.4 tsi engine with 7 dsg gearbox.

Sounds similar, but possibly not related. We have the same TSi engine and DSG box.
Mine does not seem to be temperature related, nor does theaircon/climate being on seem to make much difference. It can be as smooth as silk one minute, then,held in drive on the foot brake it will suddenly seem to miss a beat, with therev counter waving away at me between 600 and 1200 rpm. At this point if I were to take my foot offthe brake I feel the car would surge forward on its own.
The problem I have is it’s very intermittent, so accordingto the law of ‘Sod’ it behaves itself when I take it to the garage!
Still not sure what to do about it, apart from living withit until the problem gets much worse, so it becomes obvious what the problemis. Two disadvantages to that approach,one is the car is now out of warranty and second it doesn’t seem to be gettingobviously any worse yet!
Still scratching my head on this one.

[mrzaima]

I think your problem might be an air leak from a pipe or air tube, which the sensors feel it and cause an increase in fuel which is then detected as an increase in engine with no need, thus decreasing again and so on

[Boblell]

I think your problem might be an air leak from a pipe or air tube, which the sensors feel it and cause an increase in fuel which is then detected as an increase in engine with no need, thus decreasing again and so on

That makes sense, its finding it now. Any idea where to start looking?

[mrzaima]

Unfortunately it can be anywhere. Any air pipe entering the manifold can be the cause. Sometimes it can give you a clue, if this irregularity happens whenever you switch on something like AC, or engage the gear to drive, that sort of thing. Check all pipe lines, sometimes it's a small crack in a bent hardened pipe. Hope you solve your problem, these new cars are troublesome

[Boblell]

Unfortunately it can be anywhere. Any air pipe entering the manifold can be the cause. Sometimes it can give you a clue, if this irregularity happens whenever you switch on something like AC, or engage the gear to drive, that sort of thing. Check all pipe lines, sometimes it's a small crack in a bent hardened pipe. Hope you solve your problem, these new cars are troublesome
Troublesome indeed! Thanks for your help, I will start looking.

[Crasher]

Even a minute air leak on this engine will cause a fault code and the MIL to come on, we left a tiny vacuum pipe off on one a few months back after a head replacement (exhaust valve failure is becoming a terrible problem with this engine) and the engine behaved perfectly, but within one short road test the MIL was on saying lean mixture.

[Boblell]

Even a minute air leak on this engine will cause a fault code and the MIL to come on, we left a tiny vacuum pipe of on one a few months back after a head replacement (exhaust valve failure is becoming a terrible problem with this engine) and the engine behaved perfectly, but within one short road test the MIL was on saying lean mixture.

Thanks Crasher, I can see its not going to be easy. If I get a solution I will post it on here. Thanks to all

[Mercury009]

Hello…
I see how old this thread is but I wonder if u have any clues.
I have the same problem, rough idle, shaking in traffic lights.
My car is a Golf mk5 tsi 140hp.
Spark plugs, ignition coils are 12.000 km old.
I've cleaned the throttle body.
The only thing I could think of before I read this thread was a corrupted wire/silicon pipe where electricity is involved, spark plug wires etc.
Now I read here about the air filter, I ve changed it to a Ramair spongy one (dry type) and I've removed the black plastic under it a while ago with no problems.
The rough idle is quite recent, lets say that started 3000 km ago every once and a while and now its happening all of the time.
Never thought that rough idle could be an "air" problem, I always think its "electric".
I have no faults in VCDS, no misfires, nothing!
Any help would be appreciated.

Thanks. _

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[Crasher]

If it is that rough I am extremely surprised there are no codes for lambda or misfires. Have a look at the misfire data in Measuring blocks, around group 13.

[Mercury009]

Don't know how rough the rough idle should be but compared to smooth operation its annoying and gives u the feeling that something is wrong.
Also when the rough idle started got followed by a noise in the back, sounds like it comes from the exhaust pipe but I can't hear it from the outside of the car only from the inside, sounds like a deep trrrrr.
Still no faults in VCDS, I've measured blocks, no misfires, no warning lights on the dash and while in rough idle there is no ups and downs in rpm, almost always (except from cold start) 680 rpm.

Thanks for ur time. _

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[Crasher]

Have a look at the misfire values.

[Mercury009]

Have a look at the misfire values.
I did again and I had 1 misfire, 1 time in cylinder #2.
I left it with the engine running for 5 min stepping the accelerator periodically and then there were no misfires, 4 cylinders = 0.
Its not working well in idle but there are no faults in VCDS.
The guy that cleaned the TB didn't change O Ring, he used the same, I thought to mention that.

Thanks. _

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[Crasher]

Did he re-match the TB to the ECU in Basic Settings 060?

[Mercury009]

Did he re-match the TB to the ECU in Basic Settings 060?
No, he said there is no need for setup of the TB as long as u don't mess much with the inside part while u r cleaning it.
I did today basic setting of TB anyway when I was checking for misfires.

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[Crasher]

How is it now?

[Mercury009]

How is it now?
The same as my original post, nothing changed.
As has to do with the noise in the back inside… it has the second fuel pump there yes? I heard that it has some kind of net under it that collects waste and it might be dirty.
Is that a case???

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[Crasher]

Is this a 2010 with a CAXA code engine and a DSG gearbox? There is a plastic coarse mesh filter screen on the pump intake but blockage of these is rare, at least when using clean fuel.

[Mercury009]

Is this a 2010 with a CAXA code engine and a DSG gearbox? There is a plastic coarse mesh filter screen on the pump intake but blockage of these is rare, at least when using clean fuel.
No its not, its a 2007 with BMY code engine.


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[Crasher]

These are very different engines even though they are both EA111 family, yours is a twin charger, the CAXA is just a turbo. You would be have better served starting a new thread for this problem. The symptoms you describe but with no fault codes is odd, you are using full VCDS?

[Mercury009]

These are very different engines even though they are both EA111 family, yours is a twin charger, the CAXA is just a turbo. You would be have better served starting a new thread for this problem. The symptoms you describe but with no fault codes is odd, you are using full VCDS?
Im using a chinese VCDS 15.7.1, its working well the last 4 months that I have it, long coding and everything. Don't know if that makes any difference, I wouldn't think so.
I'll take it to the official dealership next week to see what happens.
I was trying to avoid it cause its unbelievably expensive here in Sweden.
They charge around 140€ an hour the labor and + possible parts. I didn't want to pay an arm and a leg for a 2007 car.
Thanks for ur time Crasher😉

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