I get this problem sometimes. I have corsa and it sounds really good but sometimes when i rev it while its parked, it makes a popping noise. It doesnt happen all of the time but sometimes it does. Does anyone know what could be causing this?

 

does it do it mostly when the engine is first started? i have corsa also (along with mac headers and oryp) it always did it when i first started it warm or cold. but after it ran for a lil while it did not pop anymore

 

Yeah i forgot to add that, its usually when first started and like you, happens on a cold start or warm start.