2008 STI jerks at full power
07 May 2018 | 01:24 PM
#1
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Scooby Newbie
Joined: May 2018
Posts: 4
Likes: 0
From: Chicago
2008 STI jerks at full power
hi
i have an STI of 2008, pretty much standard factory with corsa exhaust and cobb tuning. love the car, had it for 2 years.
recently i noticed if i floor the gas pedal in any gear above 1st, car starts jerking and loses power and all kinds of crap. feels like misfire, and check engine light comes on and misfire is reported in ECU for cylinder 1. this only happens at full power. slow steady speed up can take to 5-6k rpms without jerking in any gear, but flooring it will stark jerking at 4k rpm or lower.. so i think spark plugs or pistons? but not sure what.. what an mp3 converter.. and not sure where to bring it, dealer or tuner? hate chicago dealers, they fixed me "wrong bearings" and i ended up spending another $4k on new wheels, tires and bunch of other repairs before unfixed bearings were spotted by my old mechanic friend...
any advice, friends? thanks!! =)(
i have an STI of 2008, pretty much standard factory with corsa exhaust and cobb tuning. love the car, had it for 2 years.
recently i noticed if i floor the gas pedal in any gear above 1st, car starts jerking and loses power and all kinds of crap. feels like misfire, and check engine light comes on and misfire is reported in ECU for cylinder 1. this only happens at full power. slow steady speed up can take to 5-6k rpms without jerking in any gear, but flooring it will stark jerking at 4k rpm or lower.. so i think spark plugs or pistons? but not sure what.. what an mp3 converter.. and not sure where to bring it, dealer or tuner? hate chicago dealers, they fixed me "wrong bearings" and i ended up spending another $4k on new wheels, tires and bunch of other repairs before unfixed bearings were spotted by my old mechanic friend...
any advice, friends? thanks!! =)(
Last edited by sergeyKireev; 13 May 2018 at 05:14 PM.
07 May 2018 | 01:31 PM
#2
It could be spark plugs?My wife had a similar problem on her Subaru and the car behaved exactly as you described as your is behaving,and a change of plugs sorted the problem out,could be other things also but i find that eliminating the easiest ones first is a better way to go when it comes to diagnosing...SJ.
09 May 2018 | 01:50 PM
#3
18 June 1815 - Waterloo
iTrader: (31)
Joined: Dec 2004
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From: To the valley men!
hi
i have an STI of 2008, pretty much standard factory with corsa exhaust and cobb tuning. love the car, had it for 2 years.
recently i noticed if i floor the gas pedal in any gear above 1st, car starts jerking and loses power and all kinds of crap. feels like misfire, and check engine light comes on and misfire is reported in ECU for cylinder 1. this only happens at full power. slow steady speed up can take to 5-6k rpms without jerking in any gear, but flooring it will stark jerking at 4k rpm or lower.. so i think spark plugs or pistons? but not sure what.. and not sure where to bring it, dealer or tuner? hate chicago dealers, they fixed me "wrong bearings" and i ended up spending another $4k on new wheels, tires and bunch of other repairs before unfixed bearings were spotted by my old mechanic friend...
any advice, friends? thanks!! =)(
i have an STI of 2008, pretty much standard factory with corsa exhaust and cobb tuning. love the car, had it for 2 years.
recently i noticed if i floor the gas pedal in any gear above 1st, car starts jerking and loses power and all kinds of crap. feels like misfire, and check engine light comes on and misfire is reported in ECU for cylinder 1. this only happens at full power. slow steady speed up can take to 5-6k rpms without jerking in any gear, but flooring it will stark jerking at 4k rpm or lower.. so i think spark plugs or pistons? but not sure what.. and not sure where to bring it, dealer or tuner? hate chicago dealers, they fixed me "wrong bearings" and i ended up spending another $4k on new wheels, tires and bunch of other repairs before unfixed bearings were spotted by my old mechanic friend...
any advice, friends? thanks!! =)(
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31 May 2018 | 03:38 AM
#4
Thread Starter
Scooby Newbie
Joined: May 2018
Posts: 4
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From: Chicago
this has nothing to do with my problems, really.. tried to get my live repair session with facebook video downloader, to share here, but didn';t save it. would have shown have i tried working on spark plugs just to give up and aaa the car to the repair shoppp... i am not a master...
04 June 2018 | 09:29 PM
#7
Scooby Regular
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Joined: Sep 1999
Posts: 11,469
Likes: 23
From: MY99UK-MY02STi-MY99Type R-MY06 T20-MY11 340R-MY05 TYPE25
there are many things that can give simular issues.
1) firstly fix ecu plugs issue, replace plugs use 7 heat if tweaked
2) check all induction hoses and boost pipes for holes cracks
3) ensure good fuel
4) Does jerk happens in sport and sport#??
5) Does it do same hot or cold? check engine temp to ECU sensor, not guage sensor.
6) Does boost relay pull in and out on pulling hard?
boost spike, spooling to quick so cuts boost,
checks @ boost pipe leaks, cr4p atmo dump valve, wastegate boost actator set wrong. TGV. vvt
is it mapped for exhaust .
Hope helps.
tony
1) firstly fix ecu plugs issue, replace plugs use 7 heat if tweaked
2) check all induction hoses and boost pipes for holes cracks
3) ensure good fuel
4) Does jerk happens in sport and sport#??
5) Does it do same hot or cold? check engine temp to ECU sensor, not guage sensor.
6) Does boost relay pull in and out on pulling hard?
boost spike, spooling to quick so cuts boost,
checks @ boost pipe leaks, cr4p atmo dump valve, wastegate boost actator set wrong. TGV. vvt
is it mapped for exhaust .
Hope helps.
tony
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