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Message: <blockquote data-quote="FuGZ" data-source="post: 2828390" data-attributes="member: 2731">I was wondering if anyone had any similar symptoms/problems with their 63s, i'm facing a problem i've been tackling for about a year already.Vehicle: PutraEngine: 4G63 EVO IIIProblem: "Check Engine" light appears then car becomes1. Underpowered2. Exhaust temp reading higher than usual3. Rather not smooth accelerationNow, from number 2, i was guessing, if that's the case, there'd be prob with the fueling. I'm running with Walbro and the fuel pressure reading is fine. Couldn't be anything wrong with the fuel delivery unless whatever happens in the combustion area goes wrong.It seems this problem tends to get worse; from rarely (last year) with the "check engine" light on, occasionally, sometimes and now, always (today). When it was on "sometimes", i changed the knock sensor since the diagonse machine indicated it was knock sensor prob, but didn't quite help. Engine could be knocking, but it's not knocking, in fact it had gone thru a top overhaul just about a month ago.Googled up some answers, could be the O2 sensor, since the reading is wrong, fueling at the last mile could be incorrect, hence the exhaust temp. Tried to give the O2 sensor a shot, but we couldn't screw it out, and stopped before we actually broke something.Will be leaving the car with my mech to do more tests like running the car without the knock sensor connected.So i'm curious, has anyone experienced such thing before? Could it be dirty injectors and a dirty fuel filter which could be casuing such? Enlighten me pls experts and experienced ones.Or any idea on an easier way (maybe there's a trick) to take out the O2 sensor?</blockquote>

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