Under Boosting, Limp Mode, Possible Map Fault?

[ianyerman]

Hi all, my Alhambra is suffering from under boosting limp mode, to cut a long story short turbo has just been rebuilt, new maf fitted all vac pipes checked and when you cycle the n75 boost control valve via vagcom you can hear exhaust sound change.

When under car and watching the turbo actuator then get someone to start the engine the actuator sucks into position via the vacuum, rev the engine and the actuator moves so it's working, also when ya stop the engine a few seconds later you can here the actuator returning to it's rest position,

Car feels very sluggish and no power at low revs but if you rev it out the turbo really pulls at around 3500 rpm, the only fault I'm getting under normal driving is negative pressure so its under boosting.

Have removed the cat and tried it and no difference, also removed and cleaned the erg valve.

Have noticed oil blowing out of the small hole under the diaphragm of the erg valve, would it be possible the erg valve is blowing passed and opening letting the boost out into the exhaust causing low boost pressure?

 

Am going to block off the erg valve and try it but has any one else had a problem like this?

 

Could it be a possible map sensor fault as this all started the same time as the turbo blew?

[tim-spam]

Could be a manifold leak, or a vacuum leak.

[ianyerman]

problem sorted, was the fuel temp sensor and wasnt showing as a fault via vagcom, just giving out a duff reading.