Quote:
Originally Posted by davids
I know this is an old tread but I have the exact same condition with a/c and coming to a stop. My Mecahnic says there is an issue with front main seal that can cause air in crank case and can affect the idol. He showed me a service bulletin but I do not have it handy. Should I try the list shown here first or proceed with the seal? Totally stock with 60k miles. Meticulously maintained original owner.
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I ran across this same discussion about a main seal causing a vacuum leak issue. In the case of what I saw, it was a rear main seal on an Audi. The Youtuber is a mechanic that owns his shop. How he found it was using a smoke machine.
With that said, I highly doubt a leaky seal would only rear its head only when the A/C is turned on. It would happen all the time affecting idle whether the A/C is on or not. I personally would go have the adaptations reset and go from there. From what I remember, my dealer charged me around $160 or so to get it done which isn't that bad. Since then I have a pretty powerful scan tool which if my car starts acting up again, I will attempt to see if I can do the adaptations reset with it.