Jump to content
SAU Community

Car Goes To Stall When I Put Clutch In An Roll To A Stop

BOOZTJUNKEY

By BOOZTJUNKEY,
in General Maintenance

 Share

Recommended Posts

BOOZTJUNKEY Proficient

BOOZTJUNKEY

Posted
Posted

Hey guys

Had this issue for a lil bit but has got a lil worse since I fitted a 3" ss. Intake pipe I made

What happens is I go to start driving in any gear Iand I'f I put the clutch in the revs drop down like it wants to stall but never does but has come close

I'm leaning towards it being Afm meter related or possibly bov not being plumb back ..

I have no idleing miss or anything so which makes me think it's not the bov and airflow meter related

mad082 Grand Master

mad082

Posted
Posted

most likely due to the atmo bov. what happens is that when you lift off the throttle and the bov opens it sucks fresh air through the bov. this causes the ecu to dump in extra fuel and makes the car stall/amlost stall. putting a plumback bov on will help the situation. if the coils and/or plugs are getting on a bit then replacing them can help the situation as well, but won't solve it completely.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

Not always JUST the bov. When I had my other skyline, I fitted a atmo blitz bov and a alloy intake pipe at the same time. Started the car, started fine, drove it and it almost stalled on the first clutch in. Removed the BOV and fit the stock one on with a rubber return line. The problem got a little better but not right, still evident. I got my pipe remade with the return for the BOV flowing towards the turbo rather than straight down. What was happening is the air from the BOV was hitting the AFM, as mad082 said above, fooling the car into thinking fresh air just hit the AFM and thus putting in fuel to compensate when really it was the same air, just measured twice.

Look at the stock Nissan intake pipe, the breather and return lines are as far away from the AFM as possible and still at a 45degree angle pointing towards the turbo. Its a hint when you go to build your intake pipe.

89CAL Grand Master

89CAL

Posted
Posted

Not always JUST the bov. When I had my other skyline, I fitted a atmo blitz bov and a alloy intake pipe at the same time. Started the car, started fine, drove it and it almost stalled on the first clutch in. Removed the BOV and fit the stock one on with a rubber return line. The problem got a little better but not right, still evident. I got my pipe remade with the return for the BOV flowing towards the turbo rather than straight down. What was happening is the air from the BOV was hitting the AFM, as mad082 said above, fooling the car into thinking fresh air just hit the AFM and thus putting in fuel to compensate when really it was the same air, just measured twice.

Look at the stock Nissan intake pipe, the breather and return lines are as far away from the AFM as possible and still at a 45degree angle pointing towards the turbo. Its a hint when you go to build your intake pipe.

no, the problem with atmo BOV's is that your AFM has seen x amount of air flow through. Then you have an atmo BOV which then makes some of that air disapear. So your car then has (I'll over exagerate it to prove a point) say half the air the AFM has registered. So instead of getting x amount of air with y amount of fuel, your getting 1/2 X with 1 Y

Therefore it runs extra rich, nearly stalls till the BOV closes and the AFM can catch up.

as long as the BOV is plumbed back it shouldnt matter all that much where the air is returned as long as it gets back in before the turbo. As air will always flow towards the turbo (unless your getting compressor surge) so the air from the plumback pipe will flow that way as well..

The problem I'm guessing you had is that you ran the Atmo BOV for a little bit, changed back to plumback and your ECU went weird. I had the same problem. Pulled an ATMO BOV off and it still had all the symptoms of an Atmo BOV. Cleaned AFM, cleaned AAC, did this and that and nothing worked. Reset ECU and ran fantastic.

The ECU's are touchy, I think that might have been the issue and changing the pipe somehow fixed it. Where the air inserts back into the system shouldnt matter to much as long as its between the turbo and AFM. But thats just the way I understand it from what little I know about fluid dynamics.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • joshuaho96
      Tomei gasket

      By joshuaho96 · Posted

      I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • GTSBoy
      What brakes on R34 GTT(Europe)

      By GTSBoy · Posted

      The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Marek
      Hi everyone.

      By Marek · Posted

      Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Marek
      WGNC34 - floor mats

      By Marek · Posted

      Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
×
×
  • Create New...