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Old 12-03-2012, 02:20 PM   #876
Turn in Concepts
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Originally Posted by imma_stocker View Post
Did a turbo swap, injectors, fuel lines, FPR, inlet swap, FMIC, complete intake, spark plugs, ACT streetlight flywheel, Grimmspeed crank pulley, and meth at the same time as this. Order of parts heads up: heads -> 3mm phenolic spacer with lower gasket -> composite TGV housing with o-ring and no gasket -> intake manifold with o-ring and no gasket. Used a new gasket for the heads to spacer.

Idle misfires on all 4 cylinders. New plugs, new injectors, no change swapping around coil packs, low load misfires on all 4, no pattern I can see yet. No misfires under load. Did a BUNCH of mods at the same time so it could be anything. Might be leaking inlet coupler, might be leaking FMIC couplers, might be change in catch can routing,.... lot of "might be" but no real evidence to say what it really is. Re-used a few gaskets that looked good as I already planned to change them for a fresh piece during motor build. BOV gasket leaked over 22psi, throttle body gasket doesn't seem to leak but might also leak over a certain psi, can't find any other leak and misfires are random.

Revised my fuel lines so both banks get equal length parallel fuel lines (kinda helped). Before they were parallel but ran out of line and fittings so had to do an unequal parallel setup which still worked.


EDIT: Just to be clear this is a strange misfire that's been a monster to trace and correct. It will probably be something silly as it is random and doesn't happen under meaningful load. Idle misfires I pretty much ignore as it could be the lightened flywheel and crank pulley. I haven't noticed a repeatable pattern yet so it could literally be anything. Hell the rings might be letting too much blowby through which could cause a misfire.
Have you done a boost leak test yet?
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