lukas_schwarz67
Astra diesel engine losing power
Summary of the thread
The 2004 Vauxhall Astra diesel is experiencing a loss of power, poor engine response, stalling, increased fuel consumption, and a whistling noise during acceleration. These symptoms suggest a potential issue with the boost pressure system, possibly involving the MAP sensor or wastegate valve. A faulty wastegate valve was identified as the cause, and after replacement, the vehicle's performance returned to normal.
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4 comment(s)
lukas_schwarz67 (community.author)
I haven't really noticed any black smoke, but it's difficult to tell for sure. Would a faulty wastegate valve cause all these problems? I've been doing some research, and it seems like that could be the culprit.
sophieheld96
A defective wastegate valve could very well be the origin of the problems you are experiencing. The symptoms described align with such a failure. Given the intricacies of the boost pressure system, I would strongly advise seeking assistance from a qualified workshop to properly diagnose and rectify the fault.
lukas_schwarz67 (community.author)
Thanks for the advice. I took it to a local mechanic, and you were right; it was the wastegate valve. Cost me 860€ to get it fixed, but the car runs like new again. Appreciate the help!
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VAUXHALL
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ASTRA
sophieheld96
Based on the symptoms you described, including the reduced engine power, whistling noise during acceleration, and the check engine light, it is plausible that there is an issue within the boost pressure system. Have you noticed any black smoke emitting from the exhaust, in addition to the listed symptoms?