06SubLegTx Posted November 26, 2017 Share Posted November 26, 2017 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? Link to comment Share on other sites More sharing options...
StephenA Posted November 26, 2017 Share Posted November 26, 2017 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. Link to comment Share on other sites More sharing options...
Subieguy165 Posted November 28, 2017 Share Posted November 28, 2017 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 Link to comment Share on other sites More sharing options...
Rooster2 Posted November 28, 2017 Share Posted November 28, 2017 Yea, I can sense that on my two Subies. I have always felt that it is normal. Link to comment Share on other sites More sharing options...
robm Posted November 29, 2017 Share Posted November 29, 2017 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. Link to comment Share on other sites More sharing options...
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