Jerking passat when cold and slow pull away

**dunkley201** · 23-10-2009,08:49 PM

Originally Posted by dunkley201

Update: The dealer called me yesterday - I am now advised the new mechatronic unit was damaged on arrival and they have had to order another!

Come next week I will have had this Highline loan car for a month already - I'll miss the heated seats!

I collected my car today - 38 days to change a Mechatronic unit! Yet again, was told to give it 500 miles or so to "adjust" to my driving style. Seems good so far. Will have to suck it and see..... At least the wait saved over a month's W&T on my car!

**gazza007** · 27-10-2009,09:52 PM

Mine not done it for ages!! but I may have another theory. I think it may have something to do with being low on fuel. I can never recall it ocurring when I have more than 10 litres in the tank & just recently I have kept it fuller than normal. Will run it down & wait & see

**Stuart W** · 27-10-2009,10:26 PM

Originally Posted by gazza007

Mine not done it for ages!! but I may have another theory. I think it may have something to do with being low on fuel. I can never recall it ocurring when I have more than 10 litres in the tank & just recently I have kept it fuller than normal. Will run it down & wait & see

I recall reading someone saying that the problem with the pump in the tank was more likely to manifest itself when low on fuel.

**gazza007** · 28-10-2009,06:12 PM

When I first had the problem a couple of years ago they changed the pump as there was a recall & they also did the Tandem pump. Anyway tank is down to last 120 miles so will observe as I have to fill up again Friday as off to GF's in Scotland

**coltam** · 29-10-2009,11:18 AM

Mine has stopped since the weather has changed. Seems when it's cold it doesn't do it at all. Strange!!! Well have had my car for two weeks as someone has ridden in the back of me and infor repairs. I have the new gti turbo for hire What a nice car

**dunkley201** · 17-03-2010,06:57 PM

A resurrection of a previous thread: My DSG Mechatronic unit was replaced, collected 23/10 last year. (See previous posts on this thread #2 to#31) Yesterday, starting from cold in the afternoon with the sun giving an underbonnet temp of 16 deg, it started to "chunter" again! 2nd gear, about 2000 revs, like a kangaroo!. The indicated temp soon dropped to 12.5 deg. Such a shame as the DSG has been great up until now. I have the car booked in 6th April.... I'll let you know....

**gazza007** · 18-03-2010,10:38 AM

Same thing happened to mine about 10 days ago, I'm convinced now that it has nothing to do with DSG. I've heard mention of fuel temp sensor poss causing the problem. This would make sense as I think it gets fooled and reduces the mixture like not having enough choke..

**coltam** · 19-03-2010,08:02 AM

i have no problems as yet,just got my car back from the garge.They replaced all 4 injectors and the wiring loom,total cost of £2451.........

Car seems to have a better bottom end respons,and no smoke at the back when i accel.

**dunkley201** · 07-04-2010,09:28 PM

Originally Posted by dunkley201

A resurrection of a previous thread: My DSG Mechatronic unit was replaced, collected 23/10 last year. (See previous posts on this thread #2 to#31) Yesterday, starting from cold in the afternoon with the sun giving an underbonnet temp of 16 deg, it started to "chunter" again! 2nd gear, about 2000 revs, like a kangaroo!. The indicated temp soon dropped to 12.5 deg. Such a shame as the DSG has been great up until now. I have the car booked in 6th April.... I'll let you know....

The fault repeated itself a few more times. It went in for hesitation when engine cold but having been parked in the sun. (18 deg underbonnet temp, air temp really 16 or less) Last year VW authorised a mechatronic unit change for this same fault. I discussed this with the tech, saying I was convinced it was fuel related, not DSG. (say, for an old petrol car - it would be like fuel evaporation, etc) He found a ECU software update that covered engine hesitation when cold at 1500-2000 revs. That has now been done - let's see!

**gazza007** · 08-04-2010,09:06 AM

Originally Posted by dunkley201

The fault repeated itself a few more times. It went in for hesitation when engine cold but having been parked in the sun. (18 deg underbonnet temp, air temp really 16 or less) Last year VW authorised a mechatronic unit change for this same fault. I discussed this with the tech, saying I was convinced it was fuel related, not DSG. (say, for an old petrol car - it would be like fuel evaporation, etc) He found a ECU software update that covered engine hesitation when cold at 1500-2000 revs. That has now been done - let's see!

Thanks for this info, any idea on the TSB so I can pass this on?