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Author Topic: GTI DSG nearly stalling when braking  (Read 6602 times)

Offline Andy-GTI

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GTI DSG nearly stalling when braking
« on: May 11, 2015, 04:42:05 pm »
Hello,

Bit of a strange one. When coming to a stop the cars revs dip to around 450 and it feels like the cars going to stall, gives a little shudder then goes to tickover point. It doesn't do this everytime and appears more when braking abit harder. Other then that car seems fine.

The cars a 56plate GTI DSG.

Any ideas what it could be?
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Offline Llew

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Re: GTI DSG nearly stalling when braking
« Reply #1 on: May 11, 2015, 07:53:14 pm »
Is it the same when engine hot and cold?
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #2 on: May 11, 2015, 09:04:45 pm »
Yea it appears to do it when cold or fully warmed up.

 :happy2:
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Offline Llew

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Re: GTI DSG nearly stalling when braking
« Reply #3 on: May 12, 2015, 03:32:31 am »
Could be clogged air filter
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #4 on: May 13, 2015, 06:29:45 pm »
filter is clean

Any more ideas?

 :happy2:
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Offline john87

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Re: GTI DSG nearly stalling when braking
« Reply #5 on: May 15, 2015, 09:58:26 am »
I believe a symptom of a failing PCV valve can cause poor idling, possibly this could be on its' way out?
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Offline rich83

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Re: GTI DSG nearly stalling when braking
« Reply #6 on: May 15, 2015, 10:02:55 am »
IMO it's a sign of the old mechatronics not playing ball. Only fix is to replace the unit.
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #7 on: May 15, 2015, 04:30:28 pm »
Quote from: rich83 on May 15, 2015, 10:02:55 am
IMO it's a sign of the old mechatronics not playing ball. Only fix is to replace the unit.

I've done the PCV idle check by removing oil dip stick and car went nuts as expected so Im assuming PCV is fine but ill be changing regardless.

Rich83, have you got any experience with replacement mechatronics units? costs etc? Would this issue bring up a fault code?

Appreciate the help
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Offline Llew

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Re: GTI DSG nearly stalling when braking
« Reply #8 on: May 15, 2015, 08:49:55 pm »
It could be number of reasons I wouldn't jump to mechatronics so soon ,it could
 Be  maf sensor that's where I would look next
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #9 on: May 15, 2015, 09:17:39 pm »
I agree I wouldn't be flinging any money at mech units untill I know 100% going to go for the simpler fixes first. The cars perfectly driveable at the moment as its barely noticeable most of the time.

I'll go with the PCV,  MAF then DSG reset/oil change.

Anyone else had this issue?

Also anyone had replaced/repairs mechatronics units out of warranty?

 :happy2:
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Offline rich83

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Re: GTI DSG nearly stalling when braking
« Reply #10 on: May 15, 2015, 09:28:04 pm »
Well mine does it sometimes and my car is in perfect mechanical condition. The only thing it can be is the mecha.  Day reset will help initially but the problem will stil persist.
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Offline Llew

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Re: GTI DSG nearly stalling when braking
« Reply #11 on: May 15, 2015, 11:54:12 pm »
Also check the timing
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #12 on: May 16, 2015, 08:59:16 am »
Quote from: Llew on May 15, 2015, 11:54:12 pm
Also check the timing

Timing as in cam timing? Could the belt possibly jump?
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Offline Llew

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Re: GTI DSG nearly stalling when braking
« Reply #13 on: May 16, 2015, 09:18:09 am »
If you have vcds use it to scan  then check values and quantities to make sure everything is in spec
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Offline Andy-GTI

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Re: GTI DSG nearly stalling when braking
« Reply #14 on: May 16, 2015, 08:45:40 pm »
Quote from: Llew on May 16, 2015, 09:18:09 am
If you have vcds use it to scan  then check values and quantities to make sure everything is in spec

Thanks. Ill be getting full health check when I go for a DSG reset so will make sure this gets covered.

 :happy2:

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