RB25 dies when revs down

[bigcrouse]

When i rev the car up, and it revs down, the engine will rev down to its idle speed, bog then die. Can anyone help me figure this out?

[moso240]

Atmos. Blow off valve? is this during driving or free revs?

[bigcrouse]

it does it when driving, like when i pull up to stop sign, i push in on the clutch and let off the gas and when it revs down it will bog below idle and want to die. i have to hit the gas to keep it running. It does the same when i am under the hood, it idles steady all the time just not when it revs down.

[fast_s14]

do u have an aftermarket bov and is it vented to atmosphere?

[USMCgetsome]

i agree with above comments and also look into a bad maf afterwards.

[Darius]

Probably has nothing to do with a VTA BOV since it is dying at an idle. Does this only happen after the car has warmed up? Check the MAF but I wonder if the air regulator is not operating properly by sticking open. Is it plugged in (blue hard to reach plug under the manifold)?

[bigcrouse]

Thanks for the input, as soon as i try some of these things ill get back with you to tell you if it worked.

[MeanGreenS13]

maf too close to the turbo? iac valve gone or going bad?

[rb180]

try adjusting the throttle position sensor..

[Neejay]

Also check your injectors. Does it bog down at all when you're revving or accelerating?

I had 2 messed up injectors (dumping fuel) and my car would bog and almost die unless I revved it.

[ANVIL]

mine did that before and i just adjusted the idle screw to raise my idle. i was idling 700-750rpms and would want to die/bog after hard acceleration. raised it to idle 850-900ish and never happend again

[moso240]

i had the same exact problem as you...i wired the speed sensor from the dash plug to the ecu pin....Seems to be working fine now

[CDub7]

my car also has problems it runs like s*** bogs down and stalls when cold sometimes it wont even start but when warm it idles ok until i rev it to 9000 (stock non calibrated s13 tach) then when reving down it goes below idle and bogs then stalls. . .need tuned? other than that when driving it it kicks a**!

[HxC_Nismo]

if your bov is open at idle that would also cause it to want to die(its pretty much a big boost leak) recirculate your BOV and it should fix your problem.

[CDub7]

kk thanks man i actually just bought an apexi twin chamber bov but the flange is different im goin to see what i can do thanks man your really helping me out!!! maybe u can help me when my pfc comes!!! haha

[dtowngoalie]

try adjusting the throttle position sensor..

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[FinkenS14]

How do you raise the idle without a tuner?

[FAST-DATSUN]

By turning out the idle screw on the IAC valve on the back of the intake.

[FinkenS14]

Thank you