Jump to content
SAU Community

Recommended Posts

hi guys

having a little problem with my r34 at the moment, the car keeps on stalling on me when im braking to come to a stop. ive checked everything i can think of including vacum leaks and idle control valve but cant find any faults.

could it be something as simple as air/fuel ratios, as it does need a tune but i did want to clear up the prob before i put it in.

any surgestions?

thanks

Justin

Link to comment
https://www.sau.com.au/forums/topic/199441-r34-gtt-stalling-while-braking/
Share on other sites

Do you have an atmo bov installed? If you do, that's the thing causing all the stalling. To stop it, remove the bov and reinstall the standard plumb back bov.

If you don't have one installed, I'm not sure what it could be seeing that you've already checked if there's any vacuum leaks.

Do you have an atmo bov installed? If you do, that's the thing causing all the stalling. To stop it, remove the bov and reinstall the standard plumb back bov.

If you don't have one installed, I'm not sure what it could be seeing that you've already checked if there's any vacuum leaks.

NO blow off valve installed.....ive been chasing possible causes for the last couple of weekends. its starting to really get on my nerves.

check release/throwout bearing

there was an issue with my clutch that caused the same things before.

Had to keep revving it to prevent stalling.

clutch is disengaging fine. the problem happens during heavy braking and medium braking all the time.... but only when i creap up to the lights, shifting down through the gears to bring the revs back down to near idle speed then depress the brakes it wont stall then, the best way to explain it is as if when i brake it feels like the booster is using most of the air in the plenum chamber then no air to left to provide decent air-fuel ratio, although i have checked idle air control valve and can not fault it.

the problem would prob be fixed if i just tune the idle control up, but then the car would be reving near at least 1500rpm -2000rpm.

thanks

Justin

When you say you got no BOV, that's incorrect - either you have a stock blowoff valve or you got an aftermarket one.

If you got a stock one, I would check it out, check the vacuum hoses for any leaks or breakage, also use cable-ties to make sure it's fastened nicely from both ends - also remove the stock BOV and make sure that the springs (or valve whatever you call it) is working probably.

Also make sure it's plumbing back 100% to the engine.

Now, if you have an aftermarket one - make sure it's a 100% plumback BOV and not one that vents to the atmospher and this will play with the airflow/fuel mixtures and the AFM will not function right.

Secondly, like most have suggested - check your AFM to see if it's working probably - might need to resoldered the adaptor ends - or get a new AFM altogether - if you need a new one get a Z32 (from the Nissan ZX's).

Finally, if you have a frontmounted intercooler - check all the hosing and make sure that everything is tightly plugged in.

And if you can afford it and have the time, get a full retune - will help you out heaps.

Good luck mate... I used to get this problem too - found out it was the BOV, plumbed it all back and it's working fine now.

When you say you got no BOV, that's incorrect - either you have a stock blowoff valve or you got an aftermarket one.

If you got a stock one, I would check it out, check the vacuum hoses for any leaks or breakage, also use cable-ties to make sure it's fastened nicely from both ends - also remove the stock BOV and make sure that the springs (or valve whatever you call it) is working probably.

Also make sure it's plumbing back 100% to the engine.

Now, if you have an aftermarket one - make sure it's a 100% plumback BOV and not one that vents to the atmospher and this will play with the airflow/fuel mixtures and the AFM will not function right.

Secondly, like most have suggested - check your AFM to see if it's working probably - might need to resoldered the adaptor ends - or get a new AFM altogether - if you need a new one get a Z32 (from the Nissan ZX's).

Finally, if you have a frontmounted intercooler - check all the hosing and make sure that everything is tightly plugged in.

And if you can afford it and have the time, get a full retune - will help you out heaps.

Good luck mate... I used to get this problem too - found out it was the BOV, plumbed it all back and it's working fine now.

i understand completly what you are saying, but i dont have a blow off valve, i run my setup with out one. i used to have a turbo smart one (with the double trumpet vent to atmos) but i took that off and put a blanking plate on. i know everyone will say thats no good for my turbo because of pressure during gear changes ect... but thats just the way i have it. also this problem just started recently, and my setup with no bov have been like that for a while, so i cant see that being the prob.

if its the air flow meter the idle would be continually hunting, correct me if im wrong? but i will check that out to be sure. thanks for the help spunky munky

Edited by walkoau

Your afm will be getting a double reading when the pressure goes past it a second time, and hence telling the ecu there is twice as much air as there really is.

you need to tune around not having a bov and put your afm into your ic piping, or put up with stalling.

Edited by joeyjoejoejuniorshabadoo
i understand completly what you are saying, but i dont have a blow off valve, i run my setup with out one. i used to have a turbo smart one (with the double trumpet vent to atmos) but i took that off and put a blanking plate on. i know everyone will say thats no good for my turbo because of pressure during gear changes ect... but thats just the way i have it. also this problem just started recently, and my setup with no bov have been like that for a while, so i cant see that being the prob.

if its the air flow meter the idle would be continually hunting, correct me if im wrong? but i will check that out to be sure. thanks for the help spunky munky

Mate, no issue - glad I can help.

Now that's not a setup you see everyday. My advice to you is look for a stock GTT/GTR BOV and put one in - they're there for a reason to stop excess turbo surges during gear changes and protects the turbo.

Secondly, check the AFM - open it up and see if the connecting adaptor bits (sorry don't know any better to describe them) are working probably as, like I said earlier, they might need to be resoldered.

Lastly, I think your ECU needs to be tuned. I know you've been running this setup for a while with no issues, but some times it becomes a probably in the long run when the car 'can no longer cope.' For example, I went from stock BOV to a full atmospheric one - worked fine and sounded lovely for months - then about 2 months ago I started noticing the car functioning kinda weird... e.g. too lean with black smoke, a bit less responsive and then the same issue as you - stalling started happening... don't ask me why the car's taken a few months to start to react, but it just does... got a 100% plumb back one, got a mate (thanks Cheez on here) to fix my AFM and it's working like a dream now. I just bought a Greedy Emanage off a mate (thanks Slouch) and will get a full retune soon - I'm sure th car will run much better soon... some times something small can mean so much.

Now how you feel mate, but I would focus on getting this fixed ASAP as despite the car having so much power etc, what use is it if it keeps stalling - this can be potentially dangerous as well.

Cheers,

SM

  • 1 month later...
Your afm will be getting a double reading when the pressure goes past it a second time, and hence telling the ecu there is twice as much air as there really is.

you need to tune around not having a bov and put your afm into your ic piping, or put up with stalling.

Joey.............junior...(ur id name too long)

you where 100% right. on the weekend i moved my air flow meter to the intercooler piping, mounted it just before the intercoller and now problem is fixed.....yeahh... no more stalling.. it made such a big difference with the way the car runs. thanks for your help.

Justin

Guest courtney
hi guys

having a little problem with my r34 at the moment, the car keeps on stalling on me when im braking to come to a stop. ive checked everything i can think of including vacum leaks and idle control valve but cant find any faults.

could it be something as simple as air/fuel ratios, as it does need a tune but i did want to clear up the prob before i put it in.

any surgestions?

thanks

Justin

Edited by courtney

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


  • Similar Content

  • Latest Posts

    • Came here to say, put all the wiring from the new motor and gearbox in that you can, then throw the stock ECUs in the bin, and get an aftermarket ECU. Should be pretty easy if you can use a multimeter and read a wiring diagram to then use a PNP aftermarket ECU to suit the motors wiring loom, and make the minimal changes you will to get it to work in with the body loom (If any). This will mean you can very easily circumvent/bypass the Park/Neutral start disable switch, and get everything running really easy!
    • If the roof is dual skinned the whole way, IE, there's a "top" metal piece, and a "bottom" metal piece, to slow it down as much as you practically can, you should be able to get an attachment for a spray can/your spray gun, where it is a long, thin flexible hose, and when you're "spraying" it is spraying it in every direction possible. The I'd get that, and feed it through the roof as much and as far as you can. It's basically like fish oiling the car, but you're soaking it in rust converter. Then do the fix like Murray has described having cleaned up the existing metal as much as you humanly can. I'd also throw as much rust converter on that exposed metal before putting the fibreglass/metal filler over everything.   As for welding a replacement in. I've owned my own MIG welder for about 10 years. I've also worked in an industry doing MIG welding for a job for about 3 months dead straight, and we were doing 11.5 hour work days 5 days a week, plus a Saturday 6 hour day. (I then moved over to running the massive CNC plasma as I could understand the technology, and work with the main guy out there). I also f**k around with my welders a bit at home. So what I'm saying here is, I've probably got more hours on a MIG gun than you'll manage to get under your sleeve doing home sorts of jobs over the next 5 years. I also have an ACDC TIG that I got myself a year or two back. I've got a short amount of experience on the TIG only. My home MIG is also presently setup for doing thin sheet metal. Unless I didn't care about how that roof looked, and I just wanted a functional metal roof, and it being out of alignment, warped, and bowed, I would NOT attempt a roof replacement UNLESS I could do it as a whole panel like Murray described where the spot welds were.  Welding has this REALLY annoying thing, where if you want something to be perfectly square, unless you can clamp that thing to damn perfection (Welding fixture table), it is NOT going to be square, so you start to learn, the type of metal you're working with, how thick it is etc, and weld in VERY specific ways, and by knowing how YOU are as a welder, so that as the welds cool, the metal work pulls itself into place. If you want to see some cool tricky shit done, Bennets Customs is an Aussie guy, and he mentions a guy a lot call "Kyle", who is from "Make It Kustom". Watch some of their welding videos, especially on sheet metal. You can use the welder to shrink the steel in, and you can also use the welder to stretch the panel out. When you have the skill level that I have, you can shrink the metal in and out... But never on purpose like those two guys do. You just manage to f**k it all up. Then I smack it around with a hammer till it sits lower than I will want it too, then I shove filler on top and then pray to deitys that I can sand it into some form of sane shape that doesn't look like a dog has taken a shit, after eating a tonne of pumice stone... I'm all for DIY, and for learning, and please, feel free to give it a go, but be aware, you need to live with the consequences of how time consuming it is to do, AND that it's going to look no where near as good as what you can make it look with just some filler now. Oh AND, even once you replace it, it's like to still rust away again eventually, because you'll have missed putting primer and paint on some part of the newly welded in sheet metal, or against part of the existing metal you couldn't get to...   Oh, and to weld all that in, you will need to pull the window out, and strip at least the roof and A Pillars of interior trim and wiring. You'll then need things like the big fire proof/weld spatter proof mats to lay down, OR you'll end up needing to strip the ENTIRE interior to avoid sending it all up in a ball of flames. If you want to see how annoying sheet metal is to weld, head to bunnings, buy there 600x600 1.6mm mild steel (Not GAL!) sheet, and cut a few pieces, and try and weld them together. Then understand, 1.6mm sheet is nearly 50 to 100% THICKER than the cars sheet metal.   The photos I posted before, I'm replacing with 1.2mm thick mild sheet, and it's very easy to blow through both the original steel (Especially if I hit an area that should have probably been cut out a bit more) or straight through the new sheet metal. And I'm doing the floor, which can be hidden easily, and doesn't matter how pretty I make it, as long as it's damn strong! I'm also doing it in a 4WD, that has seen many off road trails, and doesn't need to look that pretty ever
    • This sounds like a perfect excuse to install a Haltech R3.
    • I do believe from context he is talking about a S0/S1 R33 RB25 with associated ECU and Wiring for that, and a manual gearbox into a R34 N/A Auto. I don't have the knowledge of all the pinouts and such but my gut feeling from doing my own conversion is to use as much of the R33 stuff that you can. The "car" wiring is quite seperate from the "Engine" wiring when all things are considered. The only things to truly consider 99% of the time is the cluster, reverse lights and potentially disabling the 'not in P/N' immobilizer circuit.
    • A realistic expectattion of how long it has to last also comes down to.... when do you think you will be banned from registering and driving old petrol powered shitters? It's 27 years since that thing was built. It probably rusted out 15 years ago. It was probably repaired and looked OK for another 10. If you do a similarish bodge job now, or perhaps slightly better with some actual rust conversion and glassing, then.... get another 10-15 years out of it, after which you'll only be permitted by the CCP to drive electric cars manufactured in their Shenzen zone anyway. 
×
×
  • Create New...