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2008 Subaru Forester Revving With Clutch In

fsbfsb Posts: 9
The idle of my 2008 Forester oscillates (between 1000 and 2000 RPM) indefinitely when I push in the clutch with the transmission still in gear. As soon as I take the car out of gear, the idle drops back to normal. I took the car to the dealership who was able to reproduce the problem but, because they didn't have a fix for it, their answer was that the car is behaving as designed. The service advisor more simply described it as a design flaw. I wonder if anyone else has the same problem and if they've had better luck getting it resolved.
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Comments

  • ateixeiraateixeira Posts: 72,587
    I doubt they're all like that, though I have not driven a 2008 specifically.

    Call 800-SUBARU3 and open up a case. They can help your dealer get to the bottom of this.

    The ECU sets the idle speed, so I bet one of the inputs is malfunctioning - a sensor or something.
  • kurtamaxxxguykurtamaxxxguy Posts: 1,747
    The XT I drive does not have this oscillation. A/C on will raise idle slightly.
    As Ateixeria mentioned, could be bad sensor or faulty ECU.
    If dealer gives no satisfaction and no other dealers are available, try opening case with Subaru.
  • epgolfsepgolfs Posts: 16
    Tried duplicating this on each of the 3 Foresters I've got sitting in my lot & couldn't. I wonder, though: You've got "Incline Assist" with a manual ~ it does not specifically STATE it in any of my documentation, but I wonder if in addition to applying the brakes momentarily, it also raises the engine rpm if the clutch is depressed on an incline....ARE you on an incline while this happens?
  • p0926p0926 Posts: 4,423
    I can't see the hill-holder feature having any effect on the idle speed, it's merely keeping the brakes applied for you.

    There's definitely something not working right though, the idle on a warm engine should hold steady at 750 rpm, regardless of whether it's in gear or not.

    -Frank
  • fsbfsb Posts: 9
    Thanks for your reply ateixeira,

    The dealership mechanic who worked on the problem, having exausted everything he could think of, did open a case with Subaru. But they weren't able to help him.
  • fsbfsb Posts: 9
    I don't know if it matters, but my Forester is a PZEV (Partial Zero Emission Vehicle).

    The problem can be duplicated at will and occurs any time I push in the clutch while I'm in motion in any gear, incline, or speed, with or without air conditioning.

    Strange eh?
  • aathertonaatherton Posts: 617
    My 08 Forester does not have this flaw. But it's a non-PZEV automatic.
  • ateixeiraateixeira Posts: 72,587
    We did get a PZEV, but the idle is smooth. Just got it last night so I'll pay close attention to how it idles tonight.
  • paisanpaisan Posts: 21,181
    Get your ecu re-flashed. I had messed with an ECU modifying program on my 05 LGT and the same thing happened. I reflashed the ecu and it fixed it up for me.

    -mike
  • johnvjohnv Posts: 40
    I think I've seen the same thing in my 2008. Does it stop when the car comes to a complete stop? I see this when I'm coasting in gear, clutch in towards a stop sign. Stops as soon as I stop rolling.
  • fsbfsb Posts: 9
    Yes, it does. It sounds like the same problem. Is your Forester, by any chance, a PZEV?
  • fsbfsb Posts: 9
    Thanks for your reply, ateixeira. The dealer wouldn't do it because they said that my car already has the latest version already. I'll have to go back and insist that they re-flash it.
  • ateixeiraateixeira Posts: 72,587
    You can still reset the ECU by disconnecting the battery. Disconnect the negative, wait 20 minutes, reconnect.

    Have your keyless remote ready and lock and unlock a few cycles to reset the alarm.
  • fsbfsb Posts: 9
    Excellent! I'll try it. Thanks very much!
  • paisanpaisan Posts: 21,181
    I'm not sure that will work though Juice. I think he'll need it to be re-programmed as there is definitely a problem in programing.

    -mike
  • fsbfsb Posts: 9
    Hi ateixeira, I reset the ECU (by disconnecting the battery for 20+ minutes) and got some interesting results. For the first 20 minutes (in surface streets driving), the idle (albeit a bit unstable*) did not bounce between 1000 to 2000 RPM when coasting in gear. However, after that (in freeway driving) the problem came back and is now behaving consistently as before.

    *By unstable, I mean that, when coasting in gear, the idle would settle to around 1000 RPM until I took the car out of gear, at which time it would return to normal (about 850 RPM). Same problem but less pronounced.

    Thanks!
  • johnvjohnv Posts: 40
    Yup, 2008 PZEV. I was able to confirm that the revving only happens when I'm in gear (usually 3rd for coasting) with clutch in. Shifting into neutral dropped the rpms to idle.
  • fsbfsb Posts: 9
    Did you take it into your dealership? If so, what did they say?
  • johnvjohnv Posts: 40
    I haven't yet but I'm due for my first oil change so I guess I'll dealer it and ask about the revving too. Have you seen people post about this on any other boards? (It's great to know that I'm not crazy ;)
  • fsbfsb Posts: 9
    I haven't seen anyone else post about this problem. I've posted in other boards as well but, so far, you're the only 2008 5-Speed PZEV owner who has replied (with or without the problem).
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