Hi,please help my s4 has been in serveral times to the garage,but it still has running problems and they never find the fault.
Basically it has No boost i can hear the turbo spinnin up ok from pull away.Cant find or hear any boost leaks.
I have had a new air flow meter fitted but all this has done is stop it missing when cold.1 symtom is Since it was fitted if you floor it in 6th then back off to half throttle the car slow's then tries to excellerate for a very short burst, now today i had another good route around and found the hose that joins the recirc valve the the metal tube was broken so i replaced it and valve on the right side was upside down then tries again and now if you floor it in 6th low revs it has NO POWER at all and there is black carbon smoke and it just wont pull the skin of a puddin ! until you change down then the smoke stops,exhaust is now quite black also feels like a light misfire.
Temp also runs a bit low on the motorway enen here in spain but it did this before theses problems,i guess thge stat is stuck for this to happen as it sits all day every day at 90 in town.
Please help
Thanks