Dear All,

 

I have an Octavia II FL 1.4 TSI and am thinking of servicing it myself when it becomes four years old in January. According to the service schedule, one of the required tasks is "inspect plenum chamber for soiling, clean if necessary." As far as I can see, this engine doesn't have a conventional plenum - instead, I think that the volume of air within the intercooler (mounted immediately downstream of the throttle) acts as a plenum. I doubt that the instruction to inspect & clean the "plenum" refers to the intercooler, but suspect that they mean the throttle body and that the work to be conducted is as per the following links: 

http://skoda.workshop-manuals.com/octavia-mk2/index.php?id=1647

http://skoda.workshop-manuals.com/octavia-mk2/index.php?id=1648

 

Does this seem sensible to you guys? Has any one tried removing and cleaning the throttle body on the 1.4 TSI engine? Any particular problems?

 

Many thanks,

 

WACH

Nah...

 

I'm sure what that means is clean the air box out when changing the air filter.

 

Yes, the air box would be the only readily cleaned "plenum" (it is technically a plenum, too).

It means the area under the plastic grille below the wipers:

 

http://skoda.workshop-manuals.com/octavia-mk2/index.php?id=485

 

Its the plenum chamber for the heater/aircon unit and can collect leaves and other debris.

 

Personally I would just spray some clean water through there using a hose to flush it out, rather than removing the wipers etc.

I didn't think that they were referring to the air box for the following reasons:

 

1. The service schedule has a separate, explicit task for "replace air filter element and clean housing" which is required every 90000km, whereas the "inspect plenum chamber for soiling, clean if necessary" task is required every 30000km/2 years.

 

2. My own car has had its 1st, 2nd & 3rd annual services conducted by the same Skoda dealer and their service sheets show that they did the "inspect plenum chamber for soiling, clean if necessary" task at 2 years (i.e. in agreement with above) but that they've never changed the air filter.

 

I had just assumed that "plenum chamber" meant an engine plenum, but am now thinking that nick74's suggestion of the plenum for the heating/aircon unit is probably correct. Any further thoughts?

 

Many thanks,

 

WACH

Doesn't the ventilation plenum have some sort of mesh over it?  I still have to pick out leaves in autumn.