IMPREZA JERKING
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This is a discussion on IMPREZA JERKING within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi their peepz I do aplogise if this has already been covered.im new to this forum but im pulling my ...

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    IMPREZA JERKING

    Hi their peepz
    I do aplogise if this has already been covered.im new to this forum but im pulling my hair out over this issue.im not a mechanic so I dnt know much tech.i know basics.i have a 1998 impreza wrx turbo jap import. When im driving the cars fine upto about 4500 rpm then as I continue to accelerate more up the rpm the car 'jerks' if thats the right term. Can anybody help me on this? One local said it could me maf sensor and someone else said its ure 02 ( lamda sensor). The car is de-cated and has apexi air filter on.

    Could it be the fact that ecu needs reset

    anothe thing is that when im parked at trafic lights and i start moving im driving along all of a sudden it feels lyk the cars stopped accelarating then out of knowhere it starts to accelarate again.

    I would appreciate if someone could enlighten me on this

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    zax
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    Where are you located? If you are in the U.S. and you have imported a car from Japan, keep in mind that the effective octane level of U.S. fuel is lower than Japan, so your ECU is not optimized.
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    Registered User Heide264's Avatar
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    I'd find a pretty good tuner and drop them a visit. Seems like whatever issue it is, it'll need fixed up eventually.

    Could be anything from you maxing your MAF out (as you said), to detonation/pulled timing, to a combination of those and additional issues.
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    i live in the UK. would resetting the ecu help? as with this car you can do so by disconnecting battery

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    zax
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    Do you know who or how the car was tuned for those parts?
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    nope sorry i dont

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    zax
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    Quote Originally Posted by k4mmy123 View Post
    nope sorry i dont
    Well then the "jerking" is the least of your concerns. You will need to ensure that the car is properly tuned for the parts that were added.
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    regarding tuning all i have is a dyno print of car at 320 bhp

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    zax
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    Quote Originally Posted by k4mmy123 View Post
    regarding tuning all i have is a dyno print of car at 320 bhp
    How do you dyno a car at "bhp"?
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    With the motor on an engine brake....
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    tbh dyno got nuttin to do wiv ma problem. do you think resseting the ecu could resolve the ecu? i dont want to spend money and get a maf sensor and its not that. or 02 sensor or spark plugs.hence the reason why i ask you pros

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    Oh boy.
    1.) You have a number of mods on the car
    2.) You're not sure if the car is properly tuned for those mods
    3.) You're asking a question "why is my car not running properly"

    hmmm....
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    the only mod that is done is the exhaust has been de cated and an air filter has been fitted. and as the service history is full by a subaru specialist im pressuming this person has done these mods.

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    This thread hurts.

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    Quote Originally Posted by k4mmy123
    the only mod that is done is the exhaust has been de cated and an air filter has been fitted. and as the service history is full by a subaru specialist im pressuming this person has done these mods.
    Get someone to remap the car to account for the modifications you have.
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