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Discussion Starter #1
Hello i have Astra g 1.7 Tdi isuzu engine

At low rpm no boost at all, it begins to have some boost when rpms are around 2.5, also on this rpm it gives a much black smoke

Tried :
New vacuum into alternator
New n75 valve for egr and turbo
New boost sensor


No vacuum leak, pipe into egr is sucking air normally, but from n75 valve that is behind engine is not sucking air to the pipe is connected to turbo wastegate

Only when engine runs for first time it sucks a bit, also it looks when the wastegate moves a bit and then get back again into positon 0 and no vacuum anymore


Any idea what to do?
 

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Discussion Starter #3
Assuming you have checked for any boost leaks, do you have and fault codes stored?
Hi, thanks for your reply.

No there is no code stored at all, scanned with different Diags like OpCom, Launch, Delphi but there is no code

Any idea?
 

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It could be a turbo or wastegate issue. You could try removing the vacuum pipe from the turbo actuator and see if you get boost any earlier on in the revs. It will likely log a fault code, but would rule out the turbo as the problem.
 
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