Subaru WRX - high, increasing revs when idle in traffic

Discussion in 'Subaru Impreza' started by Brian, Mar 31, 2007.

  1. Brian

    Brian Guest

    Hi

    My car is a 2005 Subaru WRX Sedan. It has 37000 miles and has had all
    the regular servicing.

    Last night I did some highway driving (25mins) and then was in city
    center stop/go traffic. After about 10 mins in the congestion the revs
    started to increase when idling (clutch disengaged and in neutral).
    Typically it sits at about 600rpm or so when idling, it was started
    out at 1500rpm. After another 5 minutes it had passed 2000 rpm,
    another 5 and it was close to 2750rpm. Felt as if I was holding the
    accelerator down constantly. I didn't have any engine management or
    oil lights showing on the dash, and temperature wasn't any higher than
    normal.

    Only thing that reduced the revs was to put the car into 1st or 2nd
    gears and engage the clutch. Doing this made the car feel like an
    automatic - no need to put my foot on the gas. I've probably done some
    damage to my clutch, but wasn't sure of possible damage from the high
    and increasing revs.

    I found somewhere to get my car pulled over and I turned off for
    15mins or so. When I started it up, revs seemed normal again, and I
    was able to get the car to my mechanic since I was near the highway.
    On the highway driving the car performed as it had done earlier.

    I've left the vehicle with my mechanic now, and am expecting a big
    bill! Anyone have any thoughts on this, or experience anything
    similar?

    -Brian
     
    Brian, Mar 31, 2007
    #1
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  2. Brian

    JD Guest

    I am not sure about the WRX, but the STi has electronic throttle control
    (drive by wire). If the WRX does, itcould just be a bad sensor. If not, it
    can either be an 02 sensor or something wrong with the ECU. If it is the
    ECU,it can be expensive. If it a sensor, it probably won't be too bad
     
    JD, Mar 31, 2007
    #2
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  3. Brian

    bgd Guest

    Does the wrx or sti have an egr implemented?


     
    bgd, Mar 31, 2007
    #3
  4. Brian

    Mike Guest

    I get this from my insurance website and it has it listed for my 03 WRX.
    Not sure if it specific to the WRX. but may want to look into it.

    VEHICLE SPEED CONTROL:CABLES

    Recall Number: 04V128000
    Dates Manufactured: SEP 2000 to FEB 2004
    Number of Vehicles Affected: 127580
    Date Owners Notified On: Unavailable
    ON CERTAIN PASSENGER SEDANS, WAGONS, AND SPORT UTILITY VEHICLES, THE CRUISE
    CONTROL CABLE COULD COME OUT OF ITS TRACK ON THE CRUISE CONTROL LEVER AND
    LODGE ON THE CONTROL LEVER TAB WHEN THE ACCELERATOR PEDAL IS RELEASED. IF
    THIS CONDITION OCCURS, THE THROTTLE WILL NOT RETURN TO THE IDLE POSITION AND
    WILL REMAIN IN AN OPEN POSITION.
     
    Mike, Mar 31, 2007
    #4
  5. Brian

    Blair Baucom Guest

    My 2005 Forester XS did the same with me twice. Then I figured out my foot
    was pressing the brake pedal, and would overlap the accelerator. So the
    harder I applied the brake, the higher the revs.

    I have now gotten use to the small distance between them, and now at 37000
    miles, it doesn't happen much.

    If this is not the case, then as others have posted, it is most likely the
    TPS (throttle position sensor) for the throttle by wire system. I am
    wondering what their life span will be, and I try to use cruise control as
    much as possible.

    Blair
     
    Blair Baucom, Apr 1, 2007
    #5
  6. Brian

    Stoneman Guest

    Odd you should mention this. My base Impreza (2007, 2.5i with manual
    transmission) was revving very high one morning (3,500 rpm at a stop
    light). revving it "up" to kick the idle "down" (like you do in older,
    carb'ed cars), did nothing but increase the idle. My car was at ~4000
    when I shut the engine off, put the 4-way hazards on, and popped the
    hood. No throttle control cable anywhere. It's drive by wire. I fired
    it up, problem went away. I moved the floor mats back just in case
    (away from the pedals).

    1200 km's and it's ok so far.
    Stoneman
     
    Stoneman, Apr 2, 2007
    #6
  7. Brian

    Brian Guest

    Thanks for the replies. The throttle control valve/sensor had a lot of
    carbon according to my mechanic. He tried to do some diags on the
    computer but it had been reset. No idea how this happened as I have
    never had battery/power problems. He'll have the part tomorrow and I'm
    going to drive it for a week to test the computer.

    -Brian
     
    Brian, Apr 2, 2007
    #7
  8. Brian

    dg Guest

    It never hurts (well, not that I can think of) to remove the negative
    battery cable for a few minutes. I used to have a 98 ford expedition that
    one time started having similar symptoms. A reset of the ecu or whatever by
    way of removing the battery cable fixed me right up, never had the problem
    again.

    --Dan
     
    dg, Apr 3, 2007
    #8
  9. Brian

    Jim Stewart Guest

    At the risk of stating the obvious,
    make sure the engine is *not* running
    when you do this. Load dump is a
    bad thing for automotive electronics.
     
    Jim Stewart, Apr 3, 2007
    #9
  10. Brian

    m Guest

    I have a 2003 wrx I am having the exact same problem too. its getting
    worse every year since i owned it. the only time i notice the cooling
    fans coming on is when i have the defroster on or the ac. If you
    noticed under the hood when it is revving it is really hot. i think it
    is revving to keep the coolent flowing to keep it cool. If you find
    out what the problem is with yours could you let me know too
     
    m, Apr 4, 2007
    #10
  11. Brian

    Mike Guest

    Mine does the opposite. My 03 will idle fine then dip. Sometimes it feels
    like is about to stall. I'm going to try cleaning out the IAC valve,
    probably should change my pcv valve too. I know its not time but i may pull
    my plugs and see what they look like. I dont have a CEL.
     
    Mike, Apr 4, 2007
    #11
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