MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Andy-GTI 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?
-
Is it the same when engine hot and cold?
-
Yea it appears to do it when cold or fully warmed up.
:happy2:
-
Could be clogged air filter
-
filter is clean
Any more ideas?
:happy2:
-
I believe a symptom of a failing PCV valve can cause poor idling, possibly this could be on its' way out?
-
IMO it's a sign of the old mechatronics not playing ball. Only fix is to replace the unit.
-
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
-
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
-
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:
-
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.
-
Also check the timing
-
Also check the timing
Timing as in cam timing? Could the belt possibly jump?
-
If you have vcds use it to scan then check values and quantities to make sure everything is in spec
-
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:
-
I had this problem when my diverter valve failed except mine would actually stall sometimes, maybe try changing that its probably the cheapest one to try first?
-
I'll be changing the DV as a maintenance item so this will be getting done soon as. but I fail to see how it could effect the idle? Isn't it to re circ boost? (Excuse my lack of knowledge)
Thanks :happy2:
-
Yes it is to recirc the boost, not got a clue how it was affecting mine, I have the forge vacuum operated one and the vac hose had broke of so it wasn't opening when it should do and for some reason this was making it stall when I came to a stop.
I'll be changing the DV as a maintenance item so this will be getting done soon as. but I fail to see how it could effect the idle? Isn't it to re circ boost? (Excuse my lack of knowledge)
Thanks :happy2:
-
Is this sorted now? What was it?
-
Hello,
Still no further forward. It may just be me but I don't notice it doing it much and the cars done at least 1000 miles in the last week or so.
It's due a service soon which I'm going to do a DSG oil/filter change along with a reset, if the stealers have any idea how to do one lol!!!
Will update thread once done. Car drives fine so am not jumping at it as fast as maybe I should, if it's the mechatronics unit, I want to be 100% sure before throwing that kind of cash about. Doesn't seem to be a vast amount of people who like to deal with these DSG boxes locally either