I feel like I’m making another one of these threads every week…
The car is a V3 STI The last few times I’ve driven my car I’ve noticed that the idle has been a bit rough. It wasn’t fluctuating but I could feel vibrations through the steering wheel. I didn’t think much about this.
Today everything turned to shit. I went to grab something from the local dairy and the car was running fine until then. When I started it up it wouldn’t idle, going up 1500 rpm then dropping right down. I let it set there for a while hoping that it would steady but then whitish/bluish smoke started puffing out.
The car was hesitating and wouldn’t accelerate properly but I could hear the turbo spooling. It began to puff black smoke if I gave it too much throttle. After about 3000 rpm it would run fine and have no hesitations. Every time I approached lights the idle would go crazy again and it starts puffing whitish smoke.
Also, the car hasn’t been boosting right for a few weeks. It hits about 9 psi then slowly goes up to 11. It has a Greddy Type S boost controller.
So in summary:
• idle fluctuating and rough
• Smoke puffing out at idle
• Hesitation
• Low vacuum at idle
Could it be a bad AFM or a vac leak?
Cheers guys, hopefully it’s something simple.