FELLOW v6ers. PLEASE, PLEASE HELP IF YOU CAN. THIS IS A CHALLENGE!
Our v6 2004 suffers multiple misfires when restarted before it is allowed to warm up. To clarify if we reverse from the garage and stop the engine to close the garage door,then restart and the engine will misfire. We have to hold the revs at approx 2500 for about ten minutes and then the engine runs smooth again. The engine starts from cold and hot with no misfires. We cannot use the car for short journeys and have to ensure the length of journey is sufficient to warm up the engine,each time we use it. We have renewed the coil packs ,sparkplugs,air,oil and fuel filters.engine oil and flush.maf,coolant temp sender,exhaust cam sensor,checked crankshaft sensor,cleaned throttle body and readaptation,checked pcv and secondary air system. Garage state that all readings on vcds are good. Garage manually checked timimg and found the exhaust cam timing to be out,tried to adjust with no success,so renewed the exhaust cam chain pulley,tensioner and stretch bolt. THE FAULT REMAINS ! PLEASE ANY IDEAS?. Does anyone think I should try renewing the exhaust cam chain hydraulic tensioner and or turn my attention to the ecu/map? I went to a vw/audi specialist whom checked the ecu software and reported back that it was up to date and audi has not released any upgrades for it,they explained that because audi use discs they could not reflash the software to eliminate any corruption,unlike vw which can be connected online via the obd and can be reflashed. They concluded that I would have to go to a remapping company for a reflash, but I don't know anything about remaps? I am now well and truly stuck.What to do next? The mileage is only 65000 with full audi service history.
Thanks richard