Vacuum lines are all brand new. So are boost solenoids.
My initial thought when this started getting bad was O2 sensors, but guys over on *********** reckon it isn't O2 sensors, as both banks are following the same oscillation and apparently its unlikely both will go at the same time.
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Originally Posted by vtl
Have you already replaced all your vacuum lines? Long shot since its at low rpms and your logs don't seem to indicate the boost correlates with the oscillation but worth ruling out.
I'd say O2 sensors are next on the list if they've never been replaced. O2 sensors have a zirconia element which gets depleted over the course of normal operation. I'd say if you were 120k+ they might be on their way out but might be less depending on conditions.
Vanos solenoids I'd be surprised if they were the cause if you're not throwing codes and the car is pulling good to redline. Just give them a clean since its doesn't cost anything. I ran carby cleaner through them while energizing them with a 12V power supply. Didn't notice any difference but good to know they're good.
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