Car Bucks under acceleration
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This is a discussion on Car Bucks under acceleration within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; This isnt all the time, but most of the time it will buck, like bog and then kick in, varying ...

  1. #1
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    Car Bucks under acceleration

    This isnt all the time, but most of the time it will buck, like bog and then kick in, varying from a little bit(what i would like to think is turbo lag) to mild(enough to make me get off the gas.) I don't stomp on it while the engine is cold, so most of this is near or at operating temp.

    I have an '07 WRX TR with almost 52000 miles.

    Could this be a boost leak? spark plugs? Stock airbox constriction?

    This car has no mods, I bought it less than 1000 miles ago from a suby dealer. I has a mark on the rear seat from a child seat anchor, so I'm pretty sure it was a grocery getter.

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    Registered User phernic's Avatar
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    Quote Originally Posted by admin07tr View Post
    This isnt all the time, but most of the time it will buck, like bog and then kick in, varying from a little bit(what i would like to think is turbo lag) to mild(enough to make me get off the gas.) I don't stomp on it while the engine is cold, so most of this is near or at operating temp.

    I have an '07 WRX TR with almost 52000 miles.

    Could this be a boost leak? spark plugs? Stock airbox constriction?

    This car has no mods, I bought it less than 1000 miles ago from a suby dealer. I has a mark on the rear seat from a child seat anchor, so I'm pretty sure it was a grocery getter.


    any error codes? is your CEL on?

  4. #3
    Registered User SkunkyZ's Avatar
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    My car did this little hesitation when tryin to accelerate. It ended up being a blown exhaust gasket where my exhaust manifold connects to the up pipe. My car would still hit full boost and ran great. but there was that little hesitation when I hit the gas. I ended up buyin a 2x thick grimmspeed gasket and it solved all the problems.
    07 WRX STi Stock - my new baby
    02 WRX 225 hp 222 tq - Not at Fault Accident TOTALED

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    No Codes, No CEL.

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    any other ideas?

  7. #6
    Registered User AgentH's Avatar
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    Is your problem toward wot or low in the throttle range?

    I had major bucking/throttle cut when I was anywhere from 2/3 throttle to WOT. Ended up being the fuel sock on my fuel pump was clogged with gunk. The fuel coming out of my fuel filter was a dark brown.

    Did you try an ECU reset?
    2nd WRX...
    More than meets the eye.

  8. #7
    Registered User ZACK777's Avatar
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    I had a terrible hesitation problem a couple years back that was caused by a faulty Crank Position Sensor. I doubt this would be whats causing yours becuase my car would hesitate and not rev any higher or go any faster.
    What I would do is clean the air filter, make sure you have no leaks throughout the intake system, and then check your spark plugs. If that fails just start going through everything under the hood looking for anything that looks "out of place", disconnected plugs, lose wires, etc. This is how I originally found the faulty sensor.
    Or you could simply take it to the stealership.
    good luck
    2004 PSM WRX VF39'd and loving it.
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