Rough start at first start when car has sat for several hours
My 2006 mazda 3 sedan has just recently started making a weird sound upon start up. It makes a sound as if fuel has been restricted and after like 4 or 5 seconds the engine sounds normal. It drives normal also. This problem only happens at the first start up after car has been sitting for at least 3 to 4 hours minimum.
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Sounds like you've done everything but the injectors. Run a bottle of fuel injector cleaner in a tank full of gas every time you do an oil change after this time. Also, check the fuel pressure to see if it's where should be for the injectors. But then, if it has enough pressure to go through the dirty injectors to make it run, pressure should be good. Check it anyway.
possibly ajusting itsself. any severe weather/pressure changes in your area? and if so does your cars cpu compensate for this (thinks its at a different elevation etc then resets its idle proper after a certian time? I have heard of this but not sure if VW uses it) perhaps ask the service tech.
I have had the same problem at almost exaclty the same milage. 2004 Mazda 3 3 door hatchback (5 door sedan). I was told by the service manager that there is a valve in the manifold that fails and starts flapping, sounded just like a collapsed lifter. I think this should be covered under warranty. If not the mfg warranty the emissions? .. good luck.