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Holden Astra 2009: What is causing it to sound rough?

Every few weeks my 2009 Astra sounds like a diesel, but it never does it when I take it to my mechanic and I look a fool. What could be wrong?

It's always hard when you know there's a problem, but it's never present when there's a mechanic with you. It's hard to diagnose when you can't hear it for yourself, so keep notes on when it occurs and anything you observe that might give the mechanic a clue. Things like, does it do it on cold starts, under acceleration, slowing down, at idle. Even better, record it on your smart phone so you replay it for the mechanic the next time you take it in.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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