High Idle at operating temp
04-26-2024, 09:28 AM
#1
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High Idle at operating temp
Hi everyone of Audi World 
Currently have a 2020 b9.5 a4 45 TFSI right at 45,000 miles. Just as i hit that mile mark, i noticed even in D (no not S shifting) the car is idling at 900-950rpms. I thought at first it was due to it being very hot out that day and i had the AC on, but despite outside temps and ac on or off it doesn't affect idle RPM much if any.
The car has been highway driven 90% of the time, oil changes every 5k miles and I only put 93 octane gas in the tank. There are currently no CELs, no noticeable power loss, no drop in average MPG, the idle is not rough either.
The car has never been tuned, basically always in comfort mode and i baby it around i dont drive it hard very often. Only mod is the AWE Axel back exhaust which was installed about a year ago so that shouldnt have anything to do with it.
This is my first Audi and before I bought the car i was aware of some of its more common issues and that being PCV issues and leaks, but based on just my general knowledge I think it might be the follow things,
- Dirty throttle bottle (Or leaking from the gasket)
- PCV Valve is on its way out.
- Vacuum leak some where in the system.
- I know this is far fetched but maybe a bad O2 sensor (had an rough/high idle on my Tacoma because of this)
- Maybe carbon buildup? But at the miles and being 4 years old shouldnt be an issue but who knows.
The only service that is due is the DSG fluid service that I am going to do soon.
If anyone has had similar issues on there B9 (or other ea888s) and found a solution or where to start looking for issues on the car, any info would be very helpful.
Thanks for reading!
Currently have a 2020 b9.5 a4 45 TFSI right at 45,000 miles. Just as i hit that mile mark, i noticed even in D (no not S shifting) the car is idling at 900-950rpms. I thought at first it was due to it being very hot out that day and i had the AC on, but despite outside temps and ac on or off it doesn't affect idle RPM much if any.
The car has been highway driven 90% of the time, oil changes every 5k miles and I only put 93 octane gas in the tank. There are currently no CELs, no noticeable power loss, no drop in average MPG, the idle is not rough either.
The car has never been tuned, basically always in comfort mode and i baby it around i dont drive it hard very often. Only mod is the AWE Axel back exhaust which was installed about a year ago so that shouldnt have anything to do with it.
This is my first Audi and before I bought the car i was aware of some of its more common issues and that being PCV issues and leaks, but based on just my general knowledge I think it might be the follow things,
- Dirty throttle bottle (Or leaking from the gasket)
- PCV Valve is on its way out.
- Vacuum leak some where in the system.
- I know this is far fetched but maybe a bad O2 sensor (had an rough/high idle on my Tacoma because of this)
- Maybe carbon buildup? But at the miles and being 4 years old shouldnt be an issue but who knows.
The only service that is due is the DSG fluid service that I am going to do soon.
If anyone has had similar issues on there B9 (or other ea888s) and found a solution or where to start looking for issues on the car, any info would be very helpful.
Thanks for reading!
04-26-2024, 11:42 AM
#5
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PCV Rubber? like the hoses or a certain spot?
04-28-2024, 09:27 AM
#6
My bad. It's your oil separator aka PCV.. The rubber gasket under the cap can become brittle..cracks etc.. Stops doing its job. You either replace the whole unit or the gasket. I've replaced the gasket on my GTI's and Tiguan before successfully.
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