One of my friends has a brand new 1500CC petrol car with EFI engine which just completed 40k on mileage. One day I observed that there is a little black smoke coming from the exhaust and in the same second with starts of the engine it disappear immediately. I asked him to do the same for couple of times and each time it comes for a bout 1-2 seconds and disappear with the engine start (Engine also starts in like half turn without any issue)
I worried is there anything gone wrong with the EFI system or this is the usual way of EFI systems.
Please advice.
Thanks.