I have noticed the scoob has been using a fair bit of fuel lately and on the way back from the gym it didnt quite feel right. Pulled up to drop someone off and there was a lot of smoke coming from it - It was grey smoke and there was loads if I revved it (Whilst Stationary).

Next on the road I gave it a bit of boost and pulled up about 1 mile away - Smoke gone.

I have also noticed a slight rough idle whilst it is cold.

What is grey smoke a sign of?

Is it overfuelling? Do I need to get it checked out straight away?

 

I have just read on the internet that grey smoke is water leaking into the engine - Is this correct? It is the only time I have ever noticed it though today and it seemed to go away.

Is it signs of cylinder head gasket????

 

Anyone?