The car intermittently loses power when accelerating from a stopped position. Most often happens when I am turning left. Subaru says there are no computer codes in the check engine history. Cause unknown but speculation advanced about neural network learning of the computer (seems worst after recent engine rebuild until car was driven for a couple of days where frequency of power loss diminished but not go away). Also proposed: 87 octane gas-should use 92, if not 97 only from oil company stations, not fred meyer or costco even though car is rated to accept 87 octane gas. Other hypotheses: Full gas tank vs 1/2 or less, fuel starvation causes power drop (note: Engine doesn't fully die & can be coaxed back to life by pumping the accelerator), electronic ignition system perhaps the culprit. This problem is dangerous because of the random & sudden (without warning) loss of power which any driver immediately behind my car would not be expecting & thereby cause a rear-end collision. Also, dangerous when entering a lane of traffic & suddenly the power is gone just when you need acceleration in order to merge at traffic speed into your lane. Sometimes problem occurs when going up a low angle incline (est. 10-15 degrees?) but not necessarily. When leaving a stopped position, if left foot is on the brake & right is slightly accelerating in order to pull away more rapidly from stopped position, the controlling computer will sometimes provide zero power to the accelerator but this happens only occasionally & often will work just fine to give the extra acceleration needed. Subaru says this confuses their computer & it will shut down but I have found that this happens about 1/3 of the time, in my experience. Danger comes from losing power during the time you need it the most esp. Left turns which cross traffic lanes before you can merge and driving completely normally.

- Federal Way, WA, USA

The contact owns a 2013 Subaru Legacy. While attempting to park, the vehicle unintentionally accelerated without warning and crashed into a wall. The air bags did not deploy. A police report was filed and no injuries were sustained. The vehicle was taken to an independent mechanic, but was not diagnosed; however, the body damage was repaired. The failure recurred. The vehicle was towed to the dealer, but the failure was unable to be determined. The manufacturer was notified of the failure. The failure mileage was 18,669....updated 09/19/16 updated 08/10/2017

- Lyndhurst, OH, USA

Getting on a highway from on ramp. I attempted to accelerate. The accelerator went to the floor, the car was grumbling and the pick up of speed was exceptionally slow. Rpms went to approximately 4600. I eased back on the accelerator and tried again with same slow pick up, to floor accelerator and rooms to 4000S. I was not in danger however I have had this issue before (filed a report December 2013) which did put me in danger. The car has been to the dealership service center and one other Subaru dealership multiply with the dealer reporting overfilled transmission from the manufacturer and complete repair by siphoning off the extra. They report "unable to duplicate" and assume therefore no problem.

- Bow, NH, USA

My vehicle showed significant lag in speeding up after pressing the accelerator and revved very high rpms (34-4200). This also occurred when I removed my foot from the accelerator going down a hill...high RPM (34-400) without decrease in speed. Subaru of manchester determined transmission came from manufacturer with overfilled fluid causing hesitancy and lag. Repaired and reset. On 12/28/13, my vehicle would not accelerate while travelling at 60mph on a highway so I could avoid being hit by another vehicle who was drifting towards my right side as it attempted to get on the highway. I pressed the accelerator continuously and then to the floor; RPM's revved to 5400; loud airplane type sound; with no acceleration. Subaru of manchester has since determined the transmission needed an update and reset of the transmission settings. They also found a leak between the transmission and the engine which they state came from the manufacturer. They stated the power train is fine. I will pick my vehicle up from this repair within the next 24 hours and will see if that was in fact the issue.

- Bow, NH, USA