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T4 Boost cut off!

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Old Oct 24th, 2014, 18:44   #11
Alex121
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Last Online: Oct 27th, 2020 10:45
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Originally Posted by tt82 View Post
Sounds very much like the problem my brother had with his Audi 1.9Tdi. That would go into limp mode for no reason. A VAG specialist reckoned a new turbo as the old one was over boosting. Me, my dad and my brother all reasoned that if the turbo was overboosting, then it was certainly fine. If I remember correctly we narrowed it down to 3 things.

1 Intake pressure sensor
2 Wastegate sticking
3 A control valve that was operated by vacuum pressure
Hmm, well it can't be the turbo or wastegate as they are both only a few months old, can't be the control value either as that was replaced.

Do these cars have intake sensors?
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