"Slap in the back of the head" take off issues.

[lambertia]

All,

I am having another problem which is unrelated to ACC. In its most severe case it results in the car lurching off the line and smashing you in the back of the head (so to speak).

It will typically occur when auto hold and stop/start are active. I haven't really nailed down exactly what makes it happen but what follows is an example:

After coming to a halt and removing my foot from the brake the car will shut down. When it's time to move off again I will tap the throttle to get the engine started again and wait until I feel that the car is in gear (I may be lightly feathering the throttle now ready to go - not sure). This seems to take forever (five seconds or so - I don't know why it finds it so hard to find first gear). The car will then start moving with a huge wallop which smacks you in the back of the head - all with little or no throttle.

I'm pretty sure I haven't discovered launch control in the TSI .

Has anyone had similar experience?

[gldgti]

when you come to a stop, wouldnt you usually keep your foot applied to the brake? Even if you are on level ground, I would have thought this is good practice as it alerts anyone behind that your brakes are applied.
This may have something to do with your problem if the car is expecting you to take your foot off the brake and go straight for the accelerator rather than doing whatever you are doing.

[lambertia]

when you come to a stop, wouldnt you usually keep your foot applied to the brake?

No, this is what the auto hold does - its magic : Auto Hold Function < Technical Glossary < Innovation & Technology < Volkswagen International

[grtuned]

It's seems your very aware of the way your systems function which is a good thing. These systems require control by the driver even though they are automated. Do be honest I think your post regarding the roll back is normal. You must press the brake after coming to a stop. The issue you face and it seems you have found a glitch in the system!!
This means you must press the brakes and come to a complete stop for the hill hold to activate then be ready to take off using the accelerator. If you don't this it will roll. If another vehicle does the exact same thing I would consider it a normal function.
As for your take off issue I would at least recommend to have it scanned at a dealership and also you drive while on a demo so you can show the exact issue I hope you find a tech that cares to help.
Volkswagen are a good car I think these issues shouldn't reflect a bad or poor quality vehicle.
Cheers

[lambertia]

This means you must press the brakes and come to a complete stop for the hill hold to activate then be ready to take off using the accelerator. If you don't this it will roll. If another vehicle does the exact same thing I would consider it a normal function.

This actually isn't true when the ACC is running. It stops the car and applies the brakes and keeps them on. More magic. The excessive roll-back occurs rarely.

Thanks for your feedback. I plan to take it in tomorrow. I also have an annoying rattle right at my ear. That one they will be able to reproduce!

[The Bone Ranger]

The combination of start/stop and auto-hold takes a little getting used to.

Have you tried driving with the start/stop turned off? I bet you'll find the car is perfectly smooth on take off.

When I first test drove a 90tsi I found that I could have one or the other on in order to drive smoothly, but not both. Since the start/stop takes a moment to start the motor when you take off, the temptation is to bury the accelerator closer to the floor, which is what you'd do in a regular automatic if it didn't respond immediately. In the Golf, this certainly will kick you in the back as you describe.

I think the engine start-up in the Golf isn't the smoothest around; it does cause a solid vibration in the car when it turns over on startup. This, combined with too much throttle input, will certainly get a drivers attention.

I think it's largely a coordination issue. How long have you had the car? It takes a little while to get the feel for all of the electronics.

Try turning the start/stop off for a drive, just to get used to throttle input, and then switch it back on. It made a difference for me.

Andrew.

[gldgti]

after reading the articvle in the link, I have to ask, do you indeed "brake gently" to a stop? Perhaps if the system is retaining a higher braking pressure during auto-hold it doesnt transition out as smoothly.

[GolfVII]

I use ACC and Auto Hold all the time and I have found sometimes it will jerk in take off after coming to a stop using ACC but this is only because I jab the accelerator in haste of moving off quickly.

One issue I have noticed is that when you have Auto Hold enabled and you are reversing out a park and when you come to a complete stop then change to Drive it can take a few seconds to select forward and move off with a jolt. Since I back out of a lot of parks lol I have tried doing it with the Auto Hold "OFF" and the gear change is smooth and no jolt... I have come to the conclusion its the Auto Hold causing the delay in changing from R to D. I have gotten used to waiting the 2 sec for the gear to be selected when using Auto Hold.

When I'm using ACC in peak hour traffic I turn the Auto hold off and set to 60 and turn myself in to a lemming, the car stops and holds by itself even though the Auto Hold is turned off.

Saying all this, I have a different engine and drive train to you, but its good to know little bugs I may think are strange do appear on other model cars and if you feel it is not right, ask the dealer like you stated you are. I think my dealer is sick of me but hey I paid them a lot of money so I want support for my product over the period of time they stated they would support it for so its a service I will be taking up at any chance I can.

[BCK]

Dont get me started.

This is driving me up the wall with my TSi R-Line.

foot off the brake, nothing, then the most massive of forward lurches. HATE IT.

Its got nothing to do with the ACC, as i havent got it fitted and its a constant issue for me.

Its a stop-start issue.

[dening]

Dont get me started.

This is driving me up the wall with my TSi R-Line.

foot off the brake, nothing, then the most massive of forward lurches. HATE IT.

Its got nothing to do with the ACC, as i havent got it fitted and its a constant issue for me.

Its a stop-start issue.

Yeah a stop start dsg issue. I keep trying to work out a technique to not have it happen...still to no avail. It's the same whether auto hold or not.

[pologti18t]

Dont get me started.

foot off the brake, nothing, then the most massive of forward lurches. HATE IT.
Its a stop-start issue.

Should the engine restart once it senses you ease off the brake? So, you take your right foot off the brake and apply it to the throttle and you get a lurch?

[Guest001]

I know the Mk 7 system works in better ways than my 3 yr old car but I have found that if I just change pedals too quickly when stop start is engaged it does bound away.

Solution is just to ease off the brake enough for the engine to restart but not allow the car to move and then when traffic moves or lights change you an accelerate normally.
As I mainly drive locally I can anticipate the lights pretty well.

[dening]

Should the engine restart once it senses you ease off the brake? So, you take your right foot off the brake and apply it to the throttle and you get a lurch?

I think it is basically as you ease off the brake and the engine restarts, the next part where the transmission re engages is the tricky part. It has usually jolted before the accelerator has been touched. So yeah you can do a slow ease off the brake to try and control it to an extent.
If i do it with auto hold it is trickier as the engine is re started by the accelerator. I haven't thought of a method to smooth that way out.

[The Bone Ranger]

If i do it with auto hold it is trickier as the engine is re started by the accelerator. I haven't thought of a method to smooth that way out.

If you give the brake pedal a good prod, it will start the engine once again. This is useful if you know the traffic lights are about to change in your favour, or you can see a gap opening in the traffic. it doesn't sort the co-ordination issue conpletely, but is useful if you want to avoid any issues in tricky traffic conditions.

For me, most of what everyone has said were all issues in the early days of ownership, but my technique has improved to the point where it is a non-issue.

Andrew

[Guest001]

Easiest way is not being lazy and turn off Auto Hold As it defeats stop start on my car I never use it.

But then its flat around here so dont really need it.

Easier just to keep foot on brake and then ease it off to let engine start as lights change and then it pulls away normally.

Maybe the mk7 is different in operation as if I hold the brake on hard the engine stays off Have to lift foot for it to restart