Recently my crankcase breather hose snapped, which has been diy'ed repaired. ( Crankcase Breather Hose )

At the same time I rearranged the pipework to my catch can, since doing this, a very slight surging issue I had has become a pronounced surging issue.

My current hypothesis is; That the the old breather/catch-can pipework was so restrictive as to effectively stop airflow through into the air-intake pipe. Upon redesigning this pipework, the restriction was removed allowing airlow from the crankcase breather system to flow into into the air intake. This excess airflow, not being accounted for ( by the map ), is making the vehicle surge ( i.e. computer sees values from MAF appearing low compared to values from the next sensor in system ).

Am I barking ( mad ) up the wrong tree, or might I be thinking along the right lines ?

Anybody ?

Got no error codes, no split pipes, no popped-off pipes, dv is fine

imo even with the new layout ( exactly how i had mine) it isnt enough airflow to cause the car to be in surge imo

you can test this by blanking off the hose that goes into the intake and just vent the catch can to atmosphere and if your still seeing surge you can see it wasnt that but if surge stops then you know the new setup is causing it !!!

HTH

told you clive would have an idea G!

That reminds me, I need to go and gather another section of pipe to vent further down the back of the car!

imo even with the new layout ( exactly how i had mine) it isnt enough airflow to cause the car to be in surge imo

you can test this by blanking off the hose that goes into the intake and just vent the catch can to atmosphere and if your still seeing surge you can see it wasnt that but if surge stops then you know the new setup is causing it !!!

HTH

cheers dude, will give this a go

can anyone recommend the best vagcom measuring blocks to use to log the surging ?

Recently my crankcase breather hose snapped, which has been diy'ed repaired. ( Crankcase Breather Hose )

At the same time I rearranged the pipework to my catch can, since doing this, a very slight surging issue I had has become a pronounced surging issue.

My current hypothesis is; That the the old breather/catch-can pipework was so restrictive as to effectively stop airflow through into the air-intake pipe. Upon redesigning this pipework, the restriction was removed allowing airlow from the crankcase breather system to flow into into the air intake. This excess airflow, not being accounted for ( by the map ), is making the vehicle surge ( i.e. computer sees values from MAF appearing low compared to values from the next sensor in system ).

Am I barking ( mad ) up the wrong tree, or might I be thinking along the right lines ?

Yep that pipe work is exactly the same as mine. I get no surging with mine..