SR20 wont rev past 2500 rpm's & no brakes

[180sxDrifter]

1. It will not rev past 2,500 rpm's,

[ho1ywars]

check the maf

[180sxDrifter]

ok I changed a few settings in the afc neo and got it to rev to redline now. When I push the brake at idle it will make the car stall.... The vaccum line from the master cylinder I have hooked up to the intake manifold, is that in the wrong spot?

[drew32]

Did you try bleeding the brakes at all? Maybe you go air in them somehow during installation of the new motor.

[sleepinsilvia23]

Check your vac lines and if that doesnt work try bleeding the brakes.

[Renegade_]

What does it feel like when the motor stops revving? Does it feel like a cylinder is going out (loss of spark, ignitor chip bad, bad coils)? Going lean (fuel pump, injectors, maf screwy)? Do you see/smell fuel shoot out of the exhaust when it stops revving?

[Nic123]

Check the check valve from the brake booster to the back of the intake manifold. what you did was correct, it was the right spot


ok I changed a few settings in the afc neo and got it to rev to redline now. When I push the brake at idle it will make the car stall.... The vaccum line from the master cylinder I have hooked up to the intake manifold, is that in the wrong spot?

[180sxDrifter]

yea turns out my brake boost where it meets the master cylinder is leaking :(.... I just need to figure out how to tune this stupid afcneo

[AnthonyJDM]

What MAF are you using? Stock? Z32?

[180sxDrifter]

yea its a stock maf as far as I can tell dont think its a z32.... people have been suggesting getting my ecu reflashed/chipped

[DN_Sileighty]

yea its a stock maf as far as I can tell dont think its a z32.... people have been suggesting getting my ecu reflashed/chipped

Make sure your maf wiring is still good, check connections and tears in the harness any where, also make sure your neo settings in hot wire mode.