Wrxsamsti Posted July 16, 2022 Share Posted July 16, 2022 hey guys, i am currently having issues with my Impreza hatchback sti (ej257). as you're on throttle it builds up and as soon as you hit higher Rpm it struggles to maintain the power and it begins to lag and sounds like a rattle coming. I've not long taken the intake pipe off the turbo to check for play and there wasn't any as far as I could tell. has anyone had any similar situations that could shed some light? there is no tell tale sighs of the notorious head gasket failure but I'm losing coolant and oil but no external leaks either which make me conclude back to the turbo. My car has limited modifications as it only has a hks catback system, a GFB hybrid bov and nothing other than that so I am pretty clue less on what is going on. please help. thank you. Sam Quote Link to comment Share on other sites More sharing options...
Linx Posted July 17, 2022 Share Posted July 17, 2022 Hi, You say you are loosing coolant and oil. So most likely the head gasket. Do a sniff test. Quote Link to comment Share on other sites More sharing options...
Wrxsamsti Posted July 17, 2022 Author Share Posted July 17, 2022 I have and there is no significant signs, it was my first go to as Subarus are notorious for it Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted July 20, 2022 Share Posted July 20, 2022 If it's a electrical or fuelling missfire, you'd normally get a eml light or code stored . So maybe get the ECU codes checked before chucking parts at it . But unfortunately it does sound like early symptoms of headgasket and the 2.5 ltr block is the most common to fail . Subaru's hardly ever mix oil and water , like most inline or "V" engines. They tend to start to push combustion gasses into the coolant on boost at first then start to burn coolant as the gasket wrap gets worse . Best way to check if you're getting the beginning of h.g failure symptoms, is to get a hydrocarbon coolant sniff test done (as suggested above ) Best of luck and hopefully its something less expensive, like a cracked rad or failing coolant pipe . Quote Link to comment Share on other sites More sharing options...
Tidgy Posted July 21, 2022 Share Posted July 21, 2022 Using some oil isnt umcommon, although depends on amount. Loosing water is a bigger concern. Add the two together and as said above doesnt sound good. Best bet get a specialist to check it out including the above mentioned sniff test. Quote Link to comment Share on other sites More sharing options...
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