Stalls When Slowing Down, Or When Revs Drop

[phat_man]

today i had the intake pipe made up, the plumb back pipe was removed, and the oil line was blocked (the one to the inlet). AFM is still at the end of the intake pipe. i know they had to remove the cooler piping so they could fit it all on properly then they put it back on. i thought it could be a leak or something, but i couldnt seem to hear it anywhere.

there is also a winding noise on idle, not the intake, something else. it just started happening after i put the intake pipe on. but i doubt its from it, sounds like its comming from some where else.

when i slow down, if i put it to neutral and then press the brakes (to slow down) it stalls as it drops way past its idle and doesnt come back up.

what can be causing this problem?

thanks alot, issa.

rb20det, r32. atmo bov, full turbo back 3" exhaust, intake pipe, pod.

Edited March 6, 2008 by phat_man

[VB-]

its becuase of the BOV, it releases all the air thats gone thorugh the AFM and teh ECU overfuels the motor. did you just put the atmo BOV on too? or did you make your stock one atmo?

[wolverine]

http://www.skylinesaustralia.com/forums/RP...G-SAG-t408.html

[phat_man]

  VB- said:

its becuase of the BOV, it releases all the air thats gone thorugh the AFM and teh ECU overfuels the motor. did you just put the atmo BOV on too? or did you make your stock one atmo?

nah the BOV was on there before, it just started happening 2day.

thanks, issa.

[MattK123]

I am relatively new to this *skylines in general* but from reading some threads about atmo bovs, they can cause stalling!

Whoa way to slow lol.

Edited February 26, 2008 by MattK123

[GTR-32U]

Your probably throwin huge flame outs on gearshifts also...get someone to follow you one night

[linedup33]

maybe tap into the new intake pipe so that will have to 2 outlets as the stock one...try putting the stock rubber one back on and see if that fixes it, if it does then its something to do with the new intake pipe otherwise its something else to look into

[GeeTR]

I woulda said atmo bov too, but you say it was working fine before the new intake pipe was made up.

So second i ask, the strange noise isn't from your PCV system is it?... i assume thats the "oil line" you speak of? Is the motor sucking air through the PCV valve "leak"?

If your unsure how the OEM blow-by recirc is setup, or how to setup a oil / air separator, hit the search.

Edited February 26, 2008 by GeeTR

[R33_Rob]

  phat_man said:

today i had the intake pipe made up, the plumb back pipe was removed, and the oil line was blocked (the one to the inlet). AFM is still at the end of the intake

Hi mate

I assumed you blocked the oil line that goes straight up and leads out of the rocker cover. I have been told (if you dont have air breathers) this can cause excess pressure inside your engine and is not a wise move. Also a major EPA violation. Sorry to hijack the thread just thought you should know.

[GeeTR]

*cough*

[The Mafia]

doesn't matter if the BOV was *apparently* working fine before you changed things.

Since you've changed the Intake, its probably changed the characteristics of the air flow to allow the BOV to cause stalling (ie allowing more airflow etc)

Block the BOV up and I bet it stops stalling.

When are people going to learn - These systems need to be sealed, thats how they are designed. You absolutely can't install a BOV because they are not meant to be there.

[GeeTR]

Come on Mafia, its not even 10am...

You know, i heard the mafia was created when the little children in Greece that mined the caves for sulphur (black powder) where robbed! 10yo robbed of thier precious yellow sulphur!

anyway, back to the "omg ma shits f_ckd" thread.

My $50 I-net dooolers is on PCV

[The Mafia]

lol come on, that was a nice reply.

But the thread starter should also check the IAC valave just in case.

I still think the better intake is allow for the BOV to cause bigger fluctuations in the air charge to cause stalling.

[phat_man]

  The Mafia said:

doesn't matter if the BOV was *apparently* working fine before you changed things.

Since you've changed the Intake, its probably changed the characteristics of the air flow to allow the BOV to cause stalling (ie allowing more airflow etc)

Block the BOV up and I bet it stops stalling.

When are people going to learn - These systems need to be sealed, thats how they are designed. You absolutely can't install a BOV because they are not meant to be there.

i already tried blocking the vac line so the bov stays closed, just made it flutter more

[phat_man]

  R33_Rob said:

Hi mate

I assumed you blocked the oil line that goes straight up and leads out of the rocker cover. I have been told (if you dont have air breathers) this can cause excess pressure inside your engine and is not a wise move. Also a major EPA violation. Sorry to hijack the thread just thought you should know.

is this true? has anyone else heard of this.

thanks, issa.

[GeeTR]

  The Mafia said:

lol come on, that was a nice reply.

But the thread starter should also check the IAC valave just in case.

I still think the better intake is allow for the BOV to cause bigger fluctuations in the air charge to cause stalling.

Hahah, it was i guess

Iv a v.close mate who has a intake pipe made up for a S14. Aftermarket BOV, but still recirc... the new pipes location for the BOV recirc gave him skethyness on gear shifts.

  phat_man said:

is this true? has anyone else heard of this.

thanks, issa.

Sure have, some retard called GeeTR mentioned somthing about that...

  GeeTR said:

I woulda said atmo bov too, but you say it was working fine before the new intake pipe was made up.

So second i ask, the strange noise isn't from your PCV system is it?... i assume thats the "oil line" you speak of? Is the motor sucking air through the PCV valve "leak"?

If your unsure how the OEM blow-by recirc is setup, or how to setup a oil / air separator, hit the search.

Like i said, learn how your PCV system works, and then trace your setup, make sure your not pressurizing your crankcase, or missing a one way valve in the PCV setup. Blocking cam breathers farks your motor, leaving em free farks EPA. Stock ingests through plenum one way on the over run, and ingests at turbo intake under boost.

If you dont like searching, i can spend the time to explain how it works

Edited February 26, 2008 by GeeTR

[phat_man]

  GeeTR said:

Hahah, it was i guess

Iv a v.close mate who has a intake pipe made up for a S14. Aftermarket BOV, but still recirc... the new pipes location for the BOV recirc gave him skethyness on gear shifts.

Sure have, some retard called GeeTR mentioned somthing about that...

Like i said, learn how your PCV system works, and then trace your setup, make sure your not pressurizing your crankcase, or missing a one way valve in the PCV setup. Blocking cam breathers farks your motor, leaving em free farks EPA. Stock ingests through plenum one way on the over run, and ingests at turbo intake under boost.

If you dont like searching, i can spend the time to explain how it works

please do. thanks alot youve helped me understand quite abit more sofar.

i know how it recirculates the air, but i was anaware about the oil line untill yesterday. whats the best way to fix this problem, and keep my motor running sound.

thanks alot, issa.

[bombtrack]

  MattK123 said:

I am relatively new to this *skylines in general* but from reading some threads about atmo bovs, they can cause stalling!

Whoa way to slow lol.

When it comes to atmo BOV's you can never be quick enough!

Threads with stall in the title = flame on!

[phat_man]

  bombtrack said:

When it comes to atmo BOV's you can never be quick enough!

Threads with stall in the title = flame on!

if you bothered to read, i said i had the bov on before and i didnt have this problem before.

[bombtrack]

  phat_man said:

if you bothered to read, i said i had the bov on before and i didnt have this problem before.

I did bother to read it and just made a commentary about what normally happens on this forum when stalling or atmo bov's are mentioned. I have no opinion one way or the other. Perhaps you'll notice that I wasn't replying to your post, denoted by the quote in my post.