Jump to content
SAU Community

Recommended Posts

Hi Guys,

Firstly, I apologise for acting so desperate, honestly I am... I have loved Skylines my whole life, saved up a long time to buy a non turbo R24 25GT on my P plates...

I will stop boring you guys and get to the problem: (I am sorry in advance if I have posted in the wrong area also)

Problem:

MOST of the times I slow down (while braking), or coming to a stop, the REVS in my car bounce, and the engine tries to stay alive, it fails, and the car stalls. I can restart the car in one go which is followed by BLACK smoke (which I guess is indicating excess fuel burning). This will only stay for a few seconds. When I take off, there is a bit of a uneven acceleration.

When I accelerate, no issue, just when I am braking or slowing down, revs bounce up and down, car stalls.

Mechanic Actions and Repairs:

The mechanic did the following (I did SELF research and understood he did as much as he could)

1. Repaired Vacum Leaks

2. Cleaned Throttle Body

3. Replaced Choke

4. Adjusted Throttle Sensor

5. ECU scan = No Errors

7. Fuel Pump checked fine

8. Fuel pressure at idle and running is fine

9. Fuel Filter cleaned (SENSORS READ FINE, BUT SOMEONE SUGGESTED THIS MIGHT BE THE ISSUE and needs replacement)

10. Air Mass Filter cleaned

For 3 days it was fine, and again the car started to act up as I was driving around on the 4th day. Mechanic again had a look, adjusted the throttle sensor a bit and everyone is clueless.

I am a student...and I work full time.... without a car, I need to take unpaid hours off to attend classes... I would be extremely grateful if someone can point me in the right direction. I did all self research and now just lost and frustrated.

Thank you in advance.

Edited by Jay88
Link to comment
https://www.sau.com.au/forums/topic/430147-urgent-help-required/
Share on other sites

Hi mate,

Firstly thank you for your reply. Appreciate it very much. I am not much of a mechanic and not sure what the air filter I use is. However, i remember once a mechanic banged the air filter with his hands (the mass air filter in the engine) and the car kinda started smooth. But the sensors read no errors. :/

Not much help, but it might point you in the right direction.

Okay, I saw a couple of things that doesn't sound right.

3. Replaced Choke - Your car doesn't have a carburettor, so there is no "choke". What you would look at in regards to this is the coolant temp sensor (two pin plug near the thermostat housing, yellow I think). Not really relevant to your issue though.

4. Adjusted Throttle Sensor - You usually don't need to do this. Is your car automatic?

9. Fuel Filter cleaned (SENSORS READ FINE, BUT SOMEONE SUGGESTED THIS MIGHT BE THE ISSUE and needs replacement) - You don't clean the fuel filter, you replace it with a new one. I forgot the exact price, but I think they go for about $25.

10. Air Mass Filter cleaned - I'm guessing this is the air filter? Throw it in the bin and replace with a new one. Paper air filter (Ryco A360) go for $10-15 dollars.

I can think of two things:

1. AFM - the air flow meter (on the air box) is playing up (clean with contact cleaner as mentioned). Might need solder fix (search in the how-to section), or replacement with a known working one.

2. IAC or AAC - auxillary air or idle air control valves on the intake plenum. Usually you take them out carefully and clean them up. I think they is a guide in the how-to section.

Does it run fine when it's cold?

Check your brake booster, could be stuffed causing a vacum leak when braking - therefore stalling.

Should NOT have had to adjust the throttle sensor IMHO - that's just masking the actual issue.

Change mechanic quick smart - to be quite honest his troubleshooting methology seems bit dodge.

you say the car blows black smoke when you get it running again, could the plugs be fouled from unburnt fuel? i know its a different engine (RB30E) but i had the same sort of issues you have, i got it sorted but i needed to change spark plugs to getting it running sweet again

Guest
This topic is now closed to further replies.


  • Similar Content

  • Latest Posts

    • Thanks everyone for the replies and suggestions. Got the seats out (hoping I could find some existing grommets but no such luck). By tapping and measuring etc. I could figure out where I could drill through if needed. But first I borrowed an inspection camera and managed to go through factory holes in the chassis rail and could see that the captive nut was holding steady which is why it could retighten. So it was indeed a stripped section of thread, so I applied downforce by levering the bolt head with a screwdriver and went slowly back and forth until it came out. Camera helped a lot cos I could monitor that the captive nut was holding tight. Now I just have one very seized main subframe nut to tackle 馃槄
    • BOVs do have a purpose, if you ever log pressure before and after the throttle body, you will see a spike pre throttle on lift off from a WOT condition. Enough to bend throttle blades / damage e-throttle motors or simple assist in blowing off cooler pipes. FWIW, the above on really applies to those running at least 2 bar of boost. OP shouldn't have an issue, on the other hand, here are some videos of my shit box over a decade ago with some succulent dose with the airbox on and off. That shit box is unrecognisable these days 馃珷    
    • I've tried all different combinations of BOVs/ no BOV and stock bypass valves over the years, on gear changes the stock bypass valve seems to get the car back on boost quicker because in part the turbos wheel speed isn't being slowed down by reversion, although they have issues holding boost much over the stock setting. Most aftermarket BOVs you can adjust the spring, tighter will make it open later and close sooner, but in my experience it'll cause a bit of flutter at low load/rpm anyway. I've also got some input into this whole no bov causing turbo wear, never had an issue on any on my turbos HOWEVER, I got my R33 GTST with 200k kms on it, with from what I can see still has the original turbo, no lateral shaft play but has about 4-5mm of play in and out which to me seems like a worn thrust bearing from years (100-150k kms?) of turbo flutter running no bov, so maybe there is some truth to it in the long run. But that'll never stop me loving the Stutututu while I have the car.   OP just wants to know if he can run a atmo vented BOV with no major issues and the answer is YES, plenty of people do it, there's no harm in installing it and seeing how it runs before spending $$$ on an aftermarket ecu, last time I bought a Nistune it was $2400 for install and a tune , unsure of todays prices but you get me. Crazy money to spend just to fix the minor inconvenience of stalling that can be overcome by letting the revs come down to near idle before putting the clutch in or a little bit of throttle to avoid it. You're better off leaving the ecu and tune for after a bigger turbo/injectors have been installed to take full advantage of the tune and get your moneys worth.   Let OP have his Whoosh sound without trying to break his bank haha
    • I see you missed the rest of the conversation where they have benefits, but nothing to do with avoiding breaking turbos, which is what the aftermarket BOV made all the fan boys, tuners, and modders believe was the only purpose for them...
    • But they do so for the other reasons to have a compressor bypass. It's in the name.
  • Create New...