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I have 159 Jtdm 16v and I have a problem with too much turbo pressure. As far as I am checking the electrical valve it is correct, the variable geometry works, but still something is wrong.
 

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Respect for all brand enthusiasts.
I have 159 Jtdm 16v and I have a problem with too much turbo pressure. As far as I am checking the electrical valve it is correct, the variable geometry works, but still something is wrong.
Overboost is usually caused by a sticking wastegate. Not sure whether the 159 has an internal or external wastegate. It can also be caused by a leak or defective sensor causing the ECU to "see" a different pressure than actual. What are you using to measure boost- how do you know it is over boosting?

Just FYI: you may have better car specific luck on alfaowner.com. This is a mostly U.S.-based forum, and the 159 was never sold in the U.S. Most Alfa people here think turbos are some sort of witchcraft.
 
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