Shuddering/Loss of Power

Faults and Technical chat for the Citroen C4 Cactus
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srperry
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Re: Shuddering/Loss of Power

Post by srperry » Tue Sep 10, 2019 8:54 am

The 'metallic rattling' suggests pinking, which means either the plugs are faulty (happens a lot with modern engines) or the timing is out?
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davew
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Re: Shuddering/Loss of Power

Post by davew » Tue Sep 10, 2019 9:46 am

srperry wrote:
Tue Sep 10, 2019 8:54 am
The 'metallic rattling' suggests pinking, which means either the plugs are faulty (happens a lot with modern engines) or the timing is out?
Also can be attributed to the fuel having too low an octane rating than is required for the high internal pressure in the cylinders, particularly relevant for engines having turbo boost. See https://en.wikipedia.org/wiki/Engine_knocking

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