Join Date: Jun 2010
Location: Phoenix AZ
Car: 2005 Outback Limited 2.5i
Feedback Score: 0 reviews
2005 2.5i rough idle
Hoping that SOMEONE has maybe figured this out. I know I'm not the only one.
Battery died 3 days ago. Immediately following replacement, idle was very low and rough, primarily when in gear but also occasionally in P or N. Drove for about 8 cycles (hoping it would heal itself as it usually does), and finally got CEL and flashing cruise. Code P0506, low idle. Checked for obvious vacuum leaks/disconnected hoses and squirted brake cleaner at connections I could see. No visible or audible leaks and no change in idle speed with brake cleaner (but how do you know if you found all the connections?). Pulled the tubing off the driver's side of the air box, and only a slight drop in idle speed. Replaced air filter (stock). Today it began doing a bump (maybe a rough downshift into 1st) when rolling to a stop. Also a fairly strong surge every now and then when it figures out it's idling too low. It's summer here so the AC is always on, but the surge does not always seem to coincide with the compressor engaging. It might be my imagination, but it seems to act up only when moving. It will idle OK in the garage, even when I turn the AC on and off and put it in and out of gear (it seems to adjust to the added loads). But, as soon as I back out about 20 feet, the idle drops and becomes erratic.
I've read varying things about cleaning the MAF sensor; seems like most threads indicate it didn't permanently fix anything. It's a little furry, so I'll give it a try when I can get some proper cleaner.
New to the site and new to thread posting in general, so thanks for any help.