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Missfire Problem Really Frustrating Rb 25 Det

danny14

By danny14,
in Engines & Forced Induction

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danny14 Mentor

danny14

Posted
Posted

hey guys i have a rb25det r33 series 1. prob is i have a miss when i come on boost .checked everything. running a link ecu reloaded ecu still does it so not tune, sent the ecu away to get checked out nothing wrong with it,changed map sensor all vac lines etc.changed to new coils (yellow jacket ) after i done this the miss was worse but its like a full cut off point when u come on boost.before with old coils there was a splutter (breakdown) so i changed them .put new plugs in gapped at .7

runs fine on standard ecu with afm doesnt miss a beat! but on link misses when boost comes on i have checked all wiring, continuity, earths , i have swapped crank angle sensor, changed ignitior. still doing it really frustrating only happens when boost comes on

please somone help would much appreciate your input.

jarrod83 Community Regular

jarrod83

Posted
Posted

my suggestion would be to find someone with a skyline that has the same coilpack setup thats definately working with the amount of boost your trying to run... swap the loom/ignitor pack and coil packs all together and test that... it definately sounds like a weak spark issue... could also try gapping the spark plugs down more.. if it still misses its mostly a weak spark issue.. also trying turning the boost down

Hope that helps

Jarrod

mad082 Grand Master

mad082

Posted
Posted

have you taken the car into the tuner to get them to check the AFRs? it may be the actual tune on the ecu that is the problem. it may be running mega rich. you said you reloaded the tune, but the tune you reloaded may have the same fault in it. put it on a dyno and see what is going on.

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