156 2.4JTDM Turbo pressure - Alfa Romeo Forum
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Hmmm 156 2.4JTDM Turbo pressure

Hi All,

Need some help, I have been getting an engine error message when rev counter gets to 4.5, then resets itself, had it plugged in and said boost pressure error? anyone had these issues before? thought could be hose? or egr? fingers crossed not turbo!?!?!

Thanks in advance

Cheers
FTF
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156 JTD 2.4 20V

You are probably getting over-boost which means the variable vanes in the turbo are not shutting down the boost pressure in time. Several potential causes for this but most likely (and cheapest to fix) is a split in the hoses to/from the turbo to the boost controller (mounted on slam panel near radiator). The variable vales on turbo are actuated by vacuum pressure metered by the boost controller and you should see the arm on the turbo move when you start the car. The arm should be easy to move by hand as otherwise the turbo vanes may be gunked up and need cleaning. Good luck. Leith
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