2018 Chevy Cruze cracked piston diagnoses misfire cylinder 1 1.4L turbo.

This car with 56k miles had a bad misfire on cylinder 1 with a P0301 code, switching coils, spark plugs, injectors still left the misfire on cylinder number 1.

Performed a compression test and results were 100, 200, 210, 210.

Removing the oil cap or dipstick tube shows an internal vacuum leak by the smoke puffs.

Car was taken to the dealership and the engine pistons were replaced, cylinder 1 had a small crack.

Car had regular maintenance done on time and same owner since new.

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