November 26, 20178 yr Hello, I have a 2006 Legacy 2.5I Automatic When I am drive @ 65-75 MPH with Cruise Control on, and the car is between a hill and flat area, I can feel the car "accelerate" then "decelerating " more that I think it is suppose to. I run 93 octane fuel. Injectors were professionally cleaned and tested. New Plugs, Ignition Coil(Subaru), Ignition Wires (Subaru), Timing Belt New (Subaru) all new components (Subaru) The engine runs smooth. I just notice this when cruise is on going up a hill. Thoughts?
November 26, 20178 yr I too am curious about this. I have the same issue with my '90 legacy w/MT. It's not bad, just noticeable enough to be annoying. Like it's seeking.
November 28, 20178 yr Mine does the same it's just the way the ecu is trying to keep the motor going fast enough to transfer the power to the tranny to try and keep the same speed when under load/No load
November 29, 20178 yr It is probably due to the way the cruise control feedback loop is tuned. Nothing to do with the engine, no way to retune it without reprogramming the cruise control. If it didn't do this, it probably wouldn't maintain speed as well on the hills, or it wouldn't work as well when the car is fully loaded.
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