Hey there… I have a problem with my 318i BMW Dolphin. It recently had an overheating problem and i got the cylinder head replaced since the other one was cracked.
Now the car is ok with boiling it does it no more...and one problem showed immediately when we tried test driving it. Now there is a pop sound on the air filter area closer to the airflow meter.
At first it will cut off the engine and won't idle, or won't even start until i do 2,3,4 tries thats when it will run nicely. I realised the sound as i made reffs with the hood open…. it will reff, pop and switch off the engine.
Im very worried but i know its a small problem. Please help.