Turbo Issues - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 18-07-11 Thread Starter
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Hmmm Turbo Issues


We have a 159 with the 1.9 jtdm engine. Recently we have found that under minimal acceleration (just enough to keep the car at a steady speed) the car judders and feels like it is stalling even though we are travelling at say 20-30 and with about 1500 rpm.

I have noticed the turbo boost gauge bar and when this happens the counter states it is at 0.
Now please correct me if I am wrong, but doesn't the turbo need to be running ALL of the time, even if its very little?
Also the cruise control function sometimes fails to keep the car at a steady speed after setting it correctly. Sometimes it doesn't work at all and sometimes it cancels itself after a few minutes. Often the car looses about 10mph then goes back up to speed on its own.
Could both issues be related?

Please could someone help, our car is still under warranty but I would like some possible explanations before taking it in to advise the mechanics.
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I can not help with the rest but you can travel at 60mph and with a light foot still be running 0 boost.
If you depress the pedal the boost will start building up.

In short no you will not necessarily run a positive boost when driving slowly.
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EGR valve gunged up and jammed open is likely
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