Missfire/hesitation Rb20det

[aussy-boyz]

hey guys just wanting to no what usually stuffs up with rb20s, Its been put into a s13 so i could be anything i guess. so the story goes its hard to start it will fire at first then die so ya have to give it some revs to get it idleing then its idles perfect, then when ya start to rev it starts missing, took it for a spin. starts to miss when taking off. hits boost and its all good,

any ideas?? its got new plugs,gtr fuel pump, fmic as well

[KayneX]

hey guys just wanting to no what usually stuffs up with rb20s, Its been put into a s13 so i could be anything i guess. so the story goes its hard to start it will fire at first then die so ya have to give it some revs to get it idleing then its idles perfect, then when ya start to rev it starts missing, took it for a spin. starts to miss when taking off. hits boost and its all good,

any ideas?? its got new plugs,gtr fuel pump, fmic as well

The first place I would start looking is the coil packs, these play up all the time. While you are there make sure the spark plugs are good too obviously. If that doesn't get it sorted then check out fuel delivery (pump, filter, etc) and other things but this should give you a good headstart anyway.

[aussy-boyz]

it runs fine underboost wich would eliminate those wont it???

[aussy-boyz]

pretty sure its a fuel problem, if you spray carbycleaner in the intake it will fire up instantly, which would mean spark should be good. just strugglering with fuel??

might check pressure??????

[aussy-boyz]

seams like the pump is losing power. you can hear the pump start to die and engine, then rev it and it builds up again???????