Technical Fiat Twin Cam Turbo Issue

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Technical Fiat Twin Cam Turbo Issue

jonnyhahn

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Nov 7, 2011
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Good Afternoon Guys!
Its been a long time since I've posted on the forum, and its good to be back!
Ive got an issue with my Fiat Twin Cam engine. I confess, its not on a Fiat, its on a Lancia Dedra but the fault will be fairly universal!
When in 3rd and 4th gear, the turbo will spool up fine and start boosting smoothly. After about 3 or 4 seconds of peak boost the turbo completely stalls, and it feels like someone has slammed the brakes on, it will lag for a couple of seconds then spool up again.
i have unplugged the boost pressure sensor and it although the boost is not as high it still happens.
any suggestions will be much appreciated!
Jonny
 
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