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Message: <blockquote data-quote="shiroitenshi" data-source="post: 2514805" data-attributes="member: 27518">I just reread and noticed one thing, if it only happens at 7-8K, then I doubt it's a seal problem.If you lose valve seal, it will show up on idle, and not 'just' higher rpm. Even a minor leak will be apparent at idle. So is piston ring seal.If you're emitting smoke, and it only happens at that rpm, I suggest checking everything over.. if you have tuned ecu, plug in original one and see.WOT and part throttle runs are different, because part throttle runs are ECU corrected, it's damn hard to gauge the AFR, because it changes depending on the 02 sensor readout. So does it happen at WOT only?If you suspect it's a valve leak, then check with a mechanic. He can try the methods I wrote above to at least pin point the problem.If you suspect it's fuelling, then the ori ecu should show if that is so, provided you run at the right amount of fuel pressure at the rails, not 1-2bar more than standard.Darkemperor, heh, just say you're not the only one with that problem.I'm going to pull out the engine and replace the rings and do a valve grind.In any case, it saves on labour, because once the head is off, can just tap the pistons out later.Anyway, mileage is already high, so it's time.. Wondering should bother getting some new crank bearings without looking at the engine yet.. My mech says no need, but I hate do do a teardown, fix it moderately, only to tear it apart again one year down the road for a crank bearing change.Well, it's going to be worked on sometime at the end of this month after raya though, so slow slow le.One curious subject I discussed though..It seems that for high compression engine, even oil leaks will not result in smoke, but get burned completely, depending on how much compression loss.. Anyway the colour for burned oil seems to vary depending on how well it is combusted, so we can assume that although the smoke colour gives hints, but it's not 100% accurate either.</blockquote>

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