I sensors pressure turbocharger I clean with trichloroethylene, do not ruin anything, it cleans really well and leaves no residue, and you can? safely use on cards, printed circuits, and what useful you can? be sure to spray with the gun to the diluent
also on my 147 1.9 jtdm 120 hp I had a similar problem and after replacing the mass air flow sensor and the sensor turbocharger with no results, and I solved it by replacing the solenoid valve of adjustment of the variable geometry (rule the depression of the polmoncino of the turbine), I discovered for the case when unplugging the connector of the valve was giving me the same defect and riattaccandolo disappeared, so I made 1+1 (I did see a pompista and had recommended me to replace the turbine :P , but not kidding)
let me know if you have been helpful
