Lifting The Idle Speed

[Seatdriver]

Now I have read somewhere on this forum that it is possible to raise the idle speed via VAG com.

 

I have previously posted regarding this noise from under the bonnet but I also have an additional irritaton which is as follows.

 

When the car is cold and is driven a short distance, when left to idle in neutral after a few seconds (not immediately) there is a peceptable shaking/shuddering develops that can be seen by the gear lever moving slightly (forwards/backwards) but can be felt inside the cabin. This shaking is directly related to an external chattering sound that can be heared from the passenger side of the car. However if I raise the revs whilst still in neutral and not touching the clutch pedal by 50rpm the shaking stops as does the chattering sound outside. The noise also stops is a depress the clutch but leave the throttle untouched (revs may rise with taking load of gearbox away but cant be certain)

 

Now is this the sign of a dying DMF, can the idle revs be raised, or could it be something else?

 

As posted before this is a 2005 1.9tdi 130 alhambra stylance.

[Mirez]

You need to adjust Channel 2 in the engine controller, there isn't a lot of "play" there though - about 75 up or down.

[SPIKEYJIMBO]

I have this same issue on my galaxy, drive my daughter the mile or so to school and whilst idling it gets shaky if I push the clutch pedal down it goes away, this problem isnt there all the time or at any sort of frequencey.. Would be interested to know what it could actually be

[insider]

I'd suggest increasing the idle speed will just mask the real problem.

[Seatdriver]

Good point regarding masking the problem, but I think this is a DMF issue. The engine is not mis firing but develops a shake at idle, and in my opinion the only item capable of producing this shake is an out of balance flywheel or out of balance clutch. The gearbox would certainly be in a very bad way for it to cause the whole engine/gearbox to shake as the only really large lump in the box is the diff, and that will be static at idle. My thoughts are that my wife has a bad habbit of leaving the car in gear on the drive (which is quite a steep slope) which is not a bad thing but she always manages to rest the car on the clutch (ie if you depress the clutch pedal the car will drop forward slightly). This stress will have been placed on the clutch/flywheel all evening/night ie almost 12 hours most nights for the last 4 years (1 lecture regarding this = husband 0 wife 1 with NO option of a re match)

 

This may have stressed the DMF/clutch.

 

Now back to the topic. I was only interested in seeing if the problem was an oscillation issue ie 850rpm faulty DMF or clutch = shake. Lift revs to 900 see if it stops.

 

This shake completely disappears once the car has warmed up.

 

Any thoughts anyone?

 

Oh and Ive come to the conclusion that Zafiras are not very well built and wont be purchasing one!