Help, engine revving

Discussion in 'General Subaru Discussion' started by bhoefing, Oct 26, 2005.

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  1. bhoefing
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    bhoefing New Member

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    When i am at a stop light for instance, when my clutch is pushed in and i am in gear before i take off, my engine will rev up to 2k by itself, stay there for a second and then go back to idle. my car never has never done this until recently and now it happens fairly consistently. is there something wrong? '05 2.5rs, no mods. any input welcome. this happens at most stopsigns, not just when i start my car.
     
    bhoefing, Oct 26, 2005
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  2. JustBlaze
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    JustBlaze BANNED

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    my car (sti) has been doing that when i first start it up, i thought it was tuned to go up a little bit to help with backing out? but its been going up to like 1.5k 2k range and hanging there for a couple minutes, so i also would like some info.....
     
    JustBlaze, Oct 27, 2005
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  3. Squiggly
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    Squiggly Squiggly

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    well, if its happening when u start up i assume its because your engine is warming up. the other one i cant help u with
     
    Squiggly, Oct 27, 2005
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  4. Speedemon
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    Speedemon Well-Known Member

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    Bent Engine mount is the other thing it might be but it seems like too small of a rev to be that.
     
    Speedemon, Oct 27, 2005
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  5. krees23
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    krees23 Well-Known Member

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    Do you have your A/C going? That will vary your RPMs.
    Does this happen all the time, or when the engine is warm / cold?
     
    krees23, Oct 27, 2005
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  6. AWDimprezaL
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    AWDimprezaL has more posts than you

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    explain how a bent engine mount would do this.... since its getting colder outside i would contribute it to the weather, do you have your ac or defrost on? ive driven many wrxs that do this
     
    AWDimprezaL, Oct 27, 2005
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  7. kickin_81
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    kickin_81 Well-Known Member

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    The engine will maintain 1000-2000 RPM if it's still cold. Once it's warmed up, it shouldn't do that anymore. Are you saying that this happens even when the motor is warmed up... even after driving for 10+ minutes? If so, check around to see if anything is loose or needs replacement.

    Or it could be that your idle air control valve is stuck from being dirty. A stuck IAC valve will cause high rpm idling at all engine temps and it makes the car hesitate and lack power. It is found right after the throttlebody, and you just need some throttlebody cleaner spray to clean it up. (and maybe a new gasket for the IAC valve)
     
    kickin_81, Oct 27, 2005
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  8. Dream
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    Dream Well-Known Member

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    My car does this from time to time, warm or cold. I dont think its anything to worry about unless its doing it all the time...
     
    Dream, Oct 27, 2005
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  9. Speedemon
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    Speedemon Well-Known Member

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    It happened to my friends sho
     
    Speedemon, Oct 27, 2005
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  10. AWDimprezaL
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    AWDimprezaL has more posts than you

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    i had an sho, it had to broken motor mounts never idled high...motor mounts have nothing to do with idle rpm unless it rips vaccume hoses off. sorry evan i win
     
    AWDimprezaL, Oct 27, 2005
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  11. FuJi K
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    FuJi K Well-Known Member

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    dont' tell me they put the hill holder on the newer cars.......how does that hill holder work anyway?
     
    FuJi K, Oct 27, 2005
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  12. ShortytheFirefighter
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    ShortytheFirefighter Pokemans. I has none. Staff Member

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    My 6 cylinder makes 1250 lb/ft of torque.
    It's basically a hydraulic valve with a small ball inside. When the car is on an incline with the brakes on, that ball rolls back and locks the brakes, and the clutch releasing is what unlocks them. That's the simplified version I remember from the Ride and Drive for the Forester.
     
    ShortytheFirefighter, Oct 27, 2005
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  13. FuJi K
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    FuJi K Well-Known Member

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    haha then I guess I'm WAY off topic then....I figure it'll help with revving? LOL@self
     
    FuJi K, Oct 28, 2005
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  14. bhoefing
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    bhoefing New Member

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    This happens after the car is warmed up. during regular driving when at a stopsign, with the clutch pressed in before i take off. it has just started to do this regularly as of lately. the engine will rise to 2k, stay there for a second or so, then settle to idle again.
     
    bhoefing, Oct 29, 2005
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  15. DISCOPOPE
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    DISCOPOPE Well-Known Member

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    04's and 05's do it.
    warmed up or not. there was a huge thread on nasioc about it.
    someone said that they heard from someone that shiv said it was emmisions related...
     
    DISCOPOPE, Oct 31, 2005
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  16. asiandude
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    asiandude Well-Known Member

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    my car do the same thing sometimes. i just thought it was normal...hummm
     
    asiandude, Oct 31, 2005
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  17. morganm
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    morganm New Member

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    Could be a throttle position sensor sending bad signals to the ECU.

    Motor mounts? buahahaha :lol:
     
    morganm, Nov 1, 2005
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