Smoke from cylinder?

[Cornwall]

Weird one, trying to fix an oil leek. Think I sorted it so let the engine idle up to temp and get white smoke out the exhaust.

gone to do a compression test and smoke came out of cylinder 3.

Test all equal across all 4. Any ideas why white smoke out the cylinder? ??

It's a new one on me

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[Cornwall]

So yeah, could be exhaust valve still open allowing smoke back from turbo and exhaust.
One way valve trick seems to fixed on idle.

Will take for test drive later and no doubt be searching for a new turbo

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