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Discussion Starter #1
Hi there,
recently got a JDM GC8 STI. Drove it a few days and all was great. Then the last 2 drives I had something strange, even though I boosted on the same trip before, the car doesn't like boost anymore suddenly. Whenever boost would come on(even slow) the car just stops accelerating and is kinda "stuttering" (?). This happens in all gears. When going slowly and early upshifting to keep out of boost, it drives as normal without boost. Just when getting into boost it just cuts.

Then I pulled over and turned the engine off and then on again and it was all as if nothing ever happened. Hitting boost perfectly fine just like before.

Any idea what I should check?
 

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Discussion Starter #2
Update: It died yesterday morning... Check engine light, then it shut off. Towed it away. Getting it to a shop on monday I guess..
 

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Ex-Mooderator
2001 RSTi, 2011 WRX Hatch
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3,231 Posts
Stop driving the car, leak-test the manifold, get a wideband and verify air/fuel, check fuel pressure, check boost levels.

The car is either knocking, over-boosting, running lean, etc, and going into limp mode.

Stop before you part out the motor forcefully.
 
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