A3 kangarooing/ Vagcom - which measuring blocks?

[Y83OLK]

Hi all.
Ive got a friend coming round tomorrow to use my vagcom.
Its a 1999 a3 1.8t (150) which is kangarooing on full boost.

Other than a full scan, which measuring blocks should i be looking at? as im guessing it wont throw any codes up.
And the weathers not really the best to be doing 3rd gear logging.


The symptoms are:
Kangarooing on boost (like fuel cut)
replaced DV + n75
no eml on


im suspecting possibly fuel pump??

Any help appreciated

 

[finesse]

002 115 119


002 : Airflow
115 : Boost pressure control - Boost pressure specified value vs Boost pressure actual value
119 : Boost pressure control - Duty cycle boost pressure control valve vs Boost pressure before throttle valve

 

[Y83OLK]

Hmm,
Just had a quick look at this.
it wont let me access 115/119/32/33 the only measuing block i could get is 002.

G/s is pulling 137 stationary, 180 on a 3rd gear run.

Anyone got any ideas?

 

[S3 Paul]

Unplug the maf. Try driving it a short way like that. See if it runs ok.
To me sounds like a metering problem

 

[Y83OLK]

Tried that, No better... Flat if anything.
Only stored codes were:
*boost limit exceeded
*Coolant temp sensor fault.

It goes like stink though - (feels like) full boost at around 1200rpm?
-shame i cant get block 115 to see what its doing.

Apparently its had a ko3-23 fitted (off an a4?) previously when his old blower cracked... If that makes any difference?

 

[S3 Paul]

have you unpluged the N75 valve?

A few years ago we fitted a k04 to a mk4 golf in place of a k03 the egt sensor plug came out and the car was fine upto about 1500rpm then if you tried to nail it ... it was like a bucking bronko ride.
Basicaly the car had no idea what was going on boost wise

 

[Y83OLK]

Yep, its got a brand new n75 and dv, as they were my first guesses.
Shall check the EGt sensor if i can see it.

Cant see why that would exceed max boost pressure though?

Cheers for your help Paul.

 

[S3 Paul]

With the golf we did. there was no restrictions in the turbo as a result of the hole... so the turbo was wildly over spinning,
Does it sound wushy??

 

[Y83OLK]

Nope, its pretty quiet. (well compared to my s3)

Just checked all vac pipes/ boost pipes/ breather pipes, cleaned out his scuttle drains - renewed the fuel reg pipe.

Ive given up for a while now whilst my fingers warm up lol.

 

[S3 Paul]

Is it only the free version of vag com you have?