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Hi all my sons Corsa D 1.2 11 plate is making a cha cha chaff plasticky scraping sound when under load. It follows engine revs up and down, it's in the area of cylinder 1&2. I've attached a video. The fluid is wd40 sprayed in vain to stop squeaky belt or pulley.
 

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Hi there is sounds like the inlet manifold gasket has gone, it doesn't sound like its running on 4 cylinders....you could squirt some water over it when running and see if you can detect and air leak...from Fred in Essex.
 
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