RavenII Posted March 19, 2023 Share Posted March 19, 2023 Hello, All I've got a '10 3.6r Limited with 170k on the clock and I've noticed a few things that I'm trying to pinpoint the cause of... When cold, lately I notice that the RPMs are fairly erratic. They jump up (as expected), but then don't stay stable, there're drops in the RPM almost as if though someone is revving the engine at like 1 second intervals. It normalizes after about 30 seconds, with the occasional spurt here and there until it's warm. The next issue, which I think might be related, is that when coasting/cruising along at around 40mph, the car feels like it's jerking. The RPM visibly dips, then it throws out the 246 bank misfire code. No other codes, just that. I've changed the coils and plugs less than 10k miles ago. OH...also, the economy gauge fluctuates. The only other thing that is a possibly related symptom...when warm, if I tap the gas (while in park), the RPM goes up as expected, but then dips low (450-500ish) then goes back to "normal". Keywords for those who search in the future: Stutter, stuttering, sporadic, stall, stalling Link to comment Share on other sites More sharing options...
NVAKeith Posted March 20, 2023 Share Posted March 20, 2023 Just idle fun I’d look to vacuum leak or throttle body. But 246 misfire…maybe AVCS? https://www.subaruoutback.org/threads/2011-3-6r-limited-intermittent-p0021-code-and-missing-on-2-4-6-cyls.548275/ Link to comment Share on other sites More sharing options...
RavenII Posted March 20, 2023 Author Share Posted March 20, 2023 1 hour ago, NVAKeith said: Just idle fun I’d look to vacuum leak or throttle body. But 246 misfire…maybe AVCS? https://www.subaruoutback.org/threads/2011-3-6r-limited-intermittent-p0021-code-and-missing-on-2-4-6-cyls.548275/ That the same thing as an OCV? Link to comment Share on other sites More sharing options...
m sprank Posted March 20, 2023 Share Posted March 20, 2023 (edited) The oil control valve supplies oil and to the AVCS (active valve control system). Edited March 20, 2023 by m sprank 2 Link to comment Share on other sites More sharing options...
RavenII Posted March 21, 2023 Author Share Posted March 21, 2023 Ok, I'm looking to buy and replace all...3? Of them, or is it 4? The parts diagram only shows 3 but I'm reading there's actually 4. Is it that there's a right and left upper (intake) and the exhaust ones are the same number for both? Link to comment Share on other sites More sharing options...
m sprank Posted March 22, 2023 Share Posted March 22, 2023 Yes. Link to comment Share on other sites More sharing options...
RavenII Posted March 22, 2023 Author Share Posted March 22, 2023 1 hour ago, m sprank said: Yes. Perfect, ordering all 4 now... Thanks man Link to comment Share on other sites More sharing options...
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