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Old 05-17-2020, 10:41 PM   #1
Turo310
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Default 2011 sti

Hello nasioc I have an 2011 sti tuned with bolt ons nothing major but Anyone have an idea why car hesitates when I accelerate On any gear. When I hit boost car doesn’t go full power starts to sputter thanks in advance guys
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Old 05-17-2020, 11:50 PM   #2
Haevn
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you check spark plugs?
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Old 05-18-2020, 03:14 AM   #3
Turo310
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you check spark plugs?
I was hoping that could be it taking it to the shop this week, but wouldn’t I have problems with the vehicle to start?
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Old 05-18-2020, 12:10 PM   #4
Jedi03
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not always...when they get worn the gap expands and its not noticeable until more air if flowing eg boost or wot...so it basically blows the spark out...also dont boost under 3k as that is basically lugging the engine and is very bad for an EJ motor...also (what happens to me once in a while lol) check couplers between the IC, turbo and block...my IC to TB likes to blow off at high pressure and driving till i can stop is similar if i hit the throttle to hard
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Old 05-18-2020, 12:11 PM   #5
BlackFighter
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RalliSpec Shortblock

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The first and easiest thing i would check is for boost/vacuum leaks. It sound more like a air leak if there is no cel.
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Old 05-18-2020, 06:40 PM   #6
Haevn
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when i had my tmic i had a leak at the coupler from tb to ic and it drove fine until you hit boost then it could cut off like your hitting fuel cut. all because of the coupler was not on all the way lol
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Old 05-21-2020, 10:13 AM   #7
Turo310
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Thanks guys im going to change the spark plugs and from there we’ll see 🙌🏽
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Old 05-21-2020, 10:42 AM   #8
BlackFighter
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Im 99% sure its a boost leak. Spark plugs will not cause such a hesitation
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Old 05-22-2020, 06:07 AM   #9
bp05obxt
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Compression test
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Old 05-24-2020, 03:54 PM   #10
Turo310
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Quote:
Originally Posted by BlackFighter View Post
Im 99% sure its a boost leak. Spark plugs will not cause such a hesitation
How do I fix that sir?
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Old 05-25-2020, 10:22 AM   #11
BlackFighter
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I usually type up a whole story how to do thing to help people, sorry to be lazy but just read over these links and if you have any questions after your done and still need help, i can try to help. Do you know where your TMIC and turbo meet? Start there. Then making sure everything is tight and and has no holes. Just follow the the air getting sucked in to your intake filter all the way to the turbo.

https://mechanicbase.com/engine/boos...mptoms-causes/



If you don't want to use the way in the videos then just do a visual/audio test with your eyes and ears. First try to understand what a boost leak is first. After you understand what a boost leak and how it acts on your car, it will make sense and much easier to look for one.

Last edited by BlackFighter; 05-27-2020 at 09:41 AM.
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Old 05-25-2020, 03:52 PM   #12
Blackfin
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One of the easiest things to check for sputtering/misfiring when you get into boost is the coils. Higher cylinder pressure under boost increases the voltage required to jump the gap in the cylinder. If your coils are damaged by corrosion (e.g.) and aren't able to produce that higher voltage, you'll get a misfire as boost builds. This happened to mine and the coil in question looked like this:

https://i.imgur.com/tPzC3M1.jpg

https://i.imgur.com/HLHUjOL.jpg

You may have some other issue but this is pretty easy "low hanging fruit" to check -- easier even than plugs.
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