Am i doing something wrong in 2016 VW Tiguan?

Haddonfield

Hi

I am an experienced driver driving over 30 years. I recently bought a 2016 VW Tiguan with stop start system.

When i am driving and i slow down but not stop i go down through the gears to second gear but when i go to accelerate the car cuts out.

This happens on a daily basis and have had a few close calls. I have never had this before.

This is my first stop start car and was wondering if im doing something wrong.

E.g. I come to a roundabout and have free access. I slow down as i approach roundabout and go down through gears to 2nd gear and when i try to increase speed the car just cuts out. Sometimes it automatically starts again and other times i have to start manually.

Any info much appreciated

b318isp

Have you bypassed the Stop-Start system, and see if it occurs? Personally speaking, I doubt that is the cause.

I'd check to see if your revs getting too low. There is a real risk of the engine suddenly stalling under ~900rpm when under load. Ours stalls very abruptly too. When we first got the car, it caught me unawares a few times - the engine is relatively quiet, and it may be hard to judge how low the revs have gone.

After that, it may be worthwhile getting a diagnostics run on it.

Haddonfield

Yeah I turned of start/stop but still happens. Have had a few hairy moments.

ednwireland

found the 2013 tiguan, quite easy to stall (well modern diesels in general) especially compared to my old tank of an 05 skoda.

Sam Russell

The Tiguan stop/start is sensitive to battery condition. Battery life is typically six years.

Vittu

Dacia duster has same issue, its like engine has no torque.

John.G

Maybe, on a quiet road just let it in second gear, it should then motor along at idling speed, then apply light/ medium braking and see does it still maintain the idling speed without cut out.

Can you take off in second gear on a level road?

Haddonfield

https://www.boards.ie/discussion/comment/120726375#Comment_120726375

It struggles to get going in 2nd gear. sometimes it will sometimes it wont.

"Maybe, on a quiet road just let it in second gear, it should then motor along at idling speed, then apply light/ medium braking and see does it still maintain the idling speed without cut out"

9 times out of 10 it will cut out when i try this

John.G

Daughter has the same year Diesel Tiguan (non DSG gearbox) and neither she or husband notice(d) anything untowards in any gear, your problem though seems common enough in these models so could be anything. A scan might show up something,

colm_mcm

If you stall the car, it will restart when you dip the clutch, so the problem may not be anything to do with the stop-start system.

colm_mcm

https://www.boards.ie/discussion/comment/120724211#Comment_120724211

If the battery was bad wouldn’t stop-start just not activate? Ie the engine will keep running.

John.G

The OP said the stop/start is disabled but the car still stalls although also states that it sometimes self starts which it shouldn't do if disabled. I do notice on mine that the engine stops when the car is still rolling at ~ 3 to 4 kms/hr, well before one might expect when stopping at lights etc. it seems to manage the battery state quite well, sometimes after a prolonged period of very short trips, the stop/start will not operate for 1/2 day or so of intermittent driving, car 4.5 years old, time will tell just how good its battery management is.

greasepalm

As far as i remember car should be stopped for engine to cut out and pedal pressing should restart it again.

Yes needs diagnostics read for errors and would ask do people do aggressive driving in those diesels to get a regen going or just simple here to there driving.

Haddonfield

https://www.boards.ie/discussion/comment/120728287#Comment_120728287

Not all the time. Sometimes has to be started manually

eronayne

Had exactly the same problem on a Seat Tarraco, which is essentially the same car. It took a few weeks to adjust my driving style to it

Found it happening mostly on roundabouts, too fast for first gear, tiny bit slow for second, Found myself feathering the clutch a little to stop it stalling.

Henry Ford III

At what point does the engine cut using stop/start? Mine only cuts when the car is in neutral and the clutch released. I think.

Press the clutch again and it starts in an instant.

This case sounds subtly different.

Haddonfield

https://www.boards.ie/discussion/comment/120733522#Comment_120733522

Exactly my problem.

zg3409

Ask your local friendly mechanic to test drive it on the same roundabouts. As them is car faulty. It can take time to get used to a new car.

Many newer cars car will automatically restart car if they cut out. It's not really the start stop system, more a helpful aid if you cut out to get you going.

greasepalm

Car should not cut out while moving as supposed to stopping at lights.

Did people ever go and get diagnostics read to see what is stored?

Flinty997

Older VW. Didn't have that problem off it cutting out and not starting. But found the stop start quite slow and intrusive. Got into the habit of a quick squirt on the throttle before I needed it to keep it awake. Sounds like types has an issue though.

John.G

I certainly don't find it slow in restarting, even with my hand on the gear lever, it will restart instantly once I dip the clutch and before I can get it into gear.

rock22

Why not change to first if too slow for a clean start in second?

O r am I missing something?

I drive 2013 Superb so probably similar engine ( 1.6 diesel) but never had this problem,

Haddonfield

https://www.boards.ie/discussion/comment/120742767#Comment_120742767

Because car is going too slow for 2nd gear and 2 fast for 1st gear. Its at this stage that it cuts out

John.G

Have you idea of the engine revs when this is happening and the vehicle speed?

You did say this is occuring with the stop/start disabled?

b318isp

https://www.boards.ie/discussion/comment/120744792#Comment_120744792

I'm pretty sure this is your issue, it was for me. Even yesterday I noticed my wife driving at 1000rpm in 6th - she simply didn't hear the revs going too low.

John.G

Possibly something to do with the fuel injection resuming, the injection ceases completely on overrun and resumes, depending on model and whether diesel/petrol at ~ 1000/1200 RPM, 1000 RPM on my petrol Polo, and will not cut off again until the engine RPM are ~ 1300RPM, you can easily monitor this by having the instantaneous fuel consumption selected/displayed, the display will just show a seies of ---- if no injection, just blipping the throttle may help in second gear which will cause the injection to recommence before the RPM fall too low?.

Sam Russell

I think there is a setting to stop the fuel cut-off during over run. That could solve it if that is the problem. It could be your style of driving.

Alternatively, it could be a servicing problem. Is it a diesel with the cheat fixed?

rock22

https://www.boards.ie/discussion/comment/120744792#Comment_120744792

Is there a gear indicator and prompt on the dash? There is on mine and it will prompt to change down (or not). If it is indicating "2" gear then it should drive away in second.

I

User1998

I always find it hard enough to cut out in 2nd gear on VW diesels. If the revs get too low the car usually starts to speed up and gets the revs back up

db

When you want to continue on in 2nd gear when the car is moving very slowly, just release the clutch without using accelerator. Then gently apply the accelerator. The engine torque will move the car on initially.

whizbang

Waggle the steering wheel around as you get to slow down at a roundabout,etc, it helps the stop/start system kicking in.

I do this almost second nature now.

ShadowSA

Happens to our 2017 Tiguan as well. Too slow for second gear but too fast for first gear. Often I find myself needed to stop the car just to put it into first so that it doesn't stall.

It's not the stop start system, just seems like its the engine on all Tiguan Diesels. On my polo petrol 2021 this doesn't happen.