have a couple of questions as far as the coolant and head gasket. So when I started the car and drove it home it was smoking a fair amount, when I got home it had dissipated. I popped the hood and noticed that the car was sucking in coolant when the engine was running but when I turned it off it would fill right back up. A lot of people have told me it was a head gasket cause of the smoke but I've heard a number of different things. if you have anymore questions please just let me know so I can lay it all out for you. Thanks guys hope we can figure this out.

 

I have an issue with AUDI A4,2003 model,it has low power,when i put the accelerator down to the bottom,revs are going up but i can not get a corresponding power,diagnostic has shown lean mixture,we have change plugs,changed coils but no improvement.At one point i discovered that the diaphragm in the PCB is broken,bought another one and its also broken.What am i missing in my trouble shooting?

 

For the coolant rushing back,there is possible restriction in the flow of coolant,i had that problem once with 2003 1.8T,i checked the thermostat,discovered it was faulty was broken and a broken piece was causing the brokage.Changed it and was all fine again

 

If the smoke from the exhaust has an antifreeze smell, it is definitely letting coolant into the combustion chamber somehow. Leaking head gaskets are prime suspects.