rb25det cuts out at 4000 rpm

[EVILS14]

when i rev to 4000 rpm my rb cuts out like its hitting a rev limiterand im running the stock 240 fuel pump so im wondering if thats my problem

[discosteak]

sounds like a maf prbloem

[shaun.shawn]

change out your coils start at the back

[zippakilla]

Is it 4000? or 3500? Maf is 3500 for safe mode/limp mode check maf wiring.

[Acecool]

2500 is limp mode for rbs... which means the maf is not connected or not getting a reading..

Are you able to rev past 4000 while idling, and it just loses power around 4000 to 4500 under load.. if so, it is 100% your coils are dirty, or starting to fail which is a common problem.

Edit:If it 100% cuts out, like wont rev further, it may not be getting enough fuel and you are running lean - fix it ASAP!!!

[zippakilla]

Thank for the correction.

[EVILS14]

well my knock sensors aint hooked up so its running rich the retards i bought the engine from cut the wires... i unpluged the maf and it had no effect on the idle at all

[EVILS14]

im sorry it is 2500 my tach was way off

[Acecool]

2500 = MAF not connected / cant get a good reading.

Solutions: EitherA: Clean itB: Replace itC: Double check the wiring to make sure it is all connected and not corroded!

[EVILS14]

fixed it was the wiring.... thanks

[guricha]

what kind of problem was it ? could you write how you fix this issue?