Stevieb_08

Wondering if anyone has had this happen to them and if there are any known fixes? It's to do with a 56 plate Hawkeye Impreza spec D STi with the EJ257 engine, no mods other than RCM head studs and gaskets. Below 4k rpm, the car feels like it's being choked, with it being more apparent at low oil temperatures. As soon as you hit ~4k the engine picks up and you get a more positive burst of power. It happens more noticeably when accelerating at a "normal" rate rather than foot down, but still happens with the foot down as well. The only engine code I have at the moment is P0410 (Secondary air pump) which I've not got round to sorting, but don't see how this would effect the power as it's more of an emissions thing? Any help is appreciated! PS it isn't turbo lag before anyone tries to be clever! 😉

And who doesn't love a pop and bang!

The car would run rich, but only for the split second that it is venting to atmosphere, the rest of the time the BOV will not be expelling air and therefore the car will be running as expected. So yeah it will run slightly rich, but for a very little length of time.

Just had the engine out of my 2006 impreza Sti to do the head gaskets (shock). It is now refitted to the car and I'm experiencing a reeeee sounding noise at about 0.4 Bar, getting louder up to 1.1 Bar where the boost limit is hit. I also have code P2021 "Intake runner position sensor/switch low bank 2 c" showing but disappears and stays off for the duration of the drive when reset, but the reeee noise was there from the moment the engine was boosted the first time, where as the code didn't appear until after the MOT last weekend. As far as I'm aware the garage didn't touch the engine. Previously it was showing the same code but on bank 2 a, but this was sorted by installing the sensor correctly as I hadnt previously. Anyone have any ideas on what the noise could be and if its related to the code, and if there is a sensor c on the ej257 intake runners/TGVs? All hoses are tight and ftted correctly around the intercooler and turbo.