Exhaust "pop" with white smoke but only once per drive
My car has developed a strange issue. Starts up fine and goes fine, though a little grumbly up to about 20mph. Once I put my foot down a little there's a pop, followed by a small amount of white smoke. Originally there was no white smoke and it felt more like a clunk in the driveline, this was happening intermittently, but since it's starting producing the smoke it's happening on nearly every drive after the car stood for a few hours.
Once the "pop" has happened the car feels absolutely fine and drives smoothly
I've not had a chance to plug in the diagnostics yet or check oil or coolant, will do this tomorrow. Are the symptoms familiar with any types of faults?