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Q - What are the symptoms of MAF failure ?
A - This can vary, depending on whether your 928 has a catalytic converter or not. MAF failure can result in weak mixture, giving low power and hesitation under acceleration. These effects are more pronounced as the engine water and ambient air temperatures rise.
Or, at the other extreme, over rich mixture with black smoke, a strong smell of petrol in the exhaust, black sooty spark plugs, and a reluctance to run unless the throttle is opened.