Jump to content
SAU Community

Recommended Posts

I have no idea whats wrong, tried to go to the gym this morning but the car wont start.

It cranks over and the engine starts then cuts out straight away.

Need a lot more info.

First. Is it out of petrol?

Second, what type of car is it? what mods do you have? When was it last serviced? Does it make any noises when you try to crank it over? Do you need to pump the gas to start it? What have you tried already to get it started? Are you using any fuel additives?

Otherwise it's like a doctor trying to diagnose an illness over the phone when a patient says "I've got a headache" It could be just about anything.

Ok where to start, full tank of petrol, no additives, BP ultimate, only had the car for 2months, last week changed the oil, no out of the ordinary noises, smells when starting, cranks over like usual, engine fires up for a few rpm then shuts off.

I have v/basic mods cept this thing called a billion VFC (variable fan controller) come to think of it, that was the last thing i was mucking around with last night. i turned it on and managed to get into the change settings part while driving, i set something then decided i had no idea what it does so i decided to turn it off by pulling out the cord that connects it (no on/off switch)

If i reflashed the cpu would that fix it?

well its fixed for now, nrma came and started it, he had no idea as well, just cranked it pumped some fuel in and it kinda spluttered to life, it misfired a bit at the start then ran ok. Weird...

Hope all is alright. could it be a blocked fuel line? or fuel pump?

The nrma guy said something bout maybe some moisture on the circuits or in the afm...but the engine bay is dry despite the non stop rain.

any other insights would be greatly appreciated

I'd say AFM man. Similar thing happened with a mates car.

I came round, unplugged the AFM, then started it with 1/4 throttle down. It was enough to limp it back to his place until he changed the AFM.

Same thing though... it'd start, for 1-2 seconds, then die.

I'd say AFM man. Similar thing happened with a mates car.

I came round, unplugged the AFM, then started it with 1/4 throttle down. It was enough to limp it back to his place until he changed the AFM.

Same thing though... it'd start, for 1-2 seconds, then die.

hmmm...wouldnt be terrible if it was the afm... thats covered by the warranty.

What i also noticed is that on cold starts it doesnt idle at a higher rpm anymore. Would that be an indication of something?

I beleive the cold-start revs is governed by the IACV? Idle Air Control Valve... although i've seen people mention cleaning the AAC valve is the go.

AFM shouldn't affect the idle when cold I don't think... but funnily enough, when my mate changed his AFM, the car idled at around 2000rpm no matter what. He took it in for a service, and the mechanic adjusted a few things (AAC valve I think), and now it's perfect.

I beleive the cold-start revs is governed by the IACV? Idle Air Control Valve... although i've seen people mention cleaning the AAC valve is the go.

AFM shouldn't affect the idle when cold I don't think... but funnily enough, when my mate changed his AFM, the car idled at around 2000rpm no matter what. He took it in for a service, and the mechanic adjusted a few things (AAC valve I think), and now it's perfect.

Was just gonna post about this actually, was checking the r33 manual diagnosis bit and it asks me to check the AAC valve, problem is I have no idea where that is. The manual isnt specific, unless im blind...

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

    • Oops... I meant to include the connector  view... BR/W - power from fuse L/W - motor negative to fan control amp (and off to HVAC pin19) OR/B - PWM signal (from HVAC pin20) B --  ground  
    • Yep, if you are applying filler it sounds like there is something wrong with the body lol. Safe to assume there is going to be a lot of sanding going on if your still applying fillers.  Picture a perfect bare metal panel, smooth as glass. You lay down your primer, it's perfect. (why are you going to sand it?) You lay down the colour and clear, it's perfect. No sanding at all took place and you've got a perfectly finished panel.  You won't be chasing your tail, sounds like you were prepping to start laying filler. If your happy with the body after the sanding, there is some bare metal exposed and some areas with primer, no issues at all, start laying the filler. You are safe to lay filler on bare metal or primer (of course check your technical data sheet as usual for what your filler is happy to adhere to).  This isn't a 100% correct statement. There is primer that is happy to adhere to smooth bare metal. There are fillers that are happy to adhere to smooth bare metal. Just make sure you're using the right materials for the job.  Typically if you are using filler, you would go primer, colour and clear. I've never seen any instances before where someone has laid colour over body filler (maybe this happens, but I haven't seen it before). So your plan sounds pretty normal to me. 
    • I don't think there's any way someone is push starting this car.. I honestly can barely move it, and moving it and steering it is just flat out not possible. I'm sure it is, but needs a bigger man than me. I have a refurbished starter now. The starter man was quite clear and consise showing me how nothing inside a starter really should contribute to slow cranking, and turned out that for the most part... my starter was entirely fine. Still, some of the wear items were replaced and luckily it didn't show any signs of getting too hot, being unfit for use, etc. Which is 'good'. I also noticed the starter definitely sounded different, which is a bit odd considering nothing should have really changed there.... Removed and refit, and we'll pretend one of the manifold bolts didn't fully tighten up and is only "pretty" tight. GM only wants 18ft/lb anyway. I also found a way to properly get my analog wideband reading very slightly leaner than the serial wideband. There's Greg related reasons for this. The serial output is the absolute source of truth, but it is a total asshole to actually stay connected and needs a laptop. The analog input does not, and works with standalone datalogging. Previously the analog input read slightly richer, but if I am aiming at 12.7 I do not want one of the widebands to be saying 12.7 when the source of truth is 13.0. Now the source of truth will be 12.65 and the Analog Wideband will read 12.7. So when I tune to 12.7 it'll be ever so slightly safer. While messing with all of this and idling extensively I can confirm my car seems to restart better while hot now. I did add an old Skyline battery cable between the head and the body though, though now I really realise I should have chosen the frame. Maybe that's a future job. The internet would have you believe that this is caused by bad grounds. In finding out where my grounds actually were I found out the engine bay battery post actually goes to the engine, as well as a seperate one (from the post) to the body of the car. So now there's a third one making the Grounding Triangle which is now a thing. I also from extensive idling have this graph. Temperature (°C) Voltage (V) 85 1.59 80 1.74 75 1.94 70 2.1 65 2.33 60 2.56 55 2.78 50 2.98 45 3.23 40 3.51 35 3.75 30 4.00   Plotted it looks like this. Which is actually... pretty linear? I have not actually put the formula into HPTuners. I will have to re-engage brain and/or re-engage the people who wanted more data to magically do it for me. Tune should be good for the 30th!
    • There are guys on Facebook under, Infiniti Owners Australia   https://www.facebook.com/share/g/1Z3RbPqx4k/?mibextid=wwXIfr What Whp are you after and I can help, and join this Q group in the states. https://www.facebook.com/share/g/19A59cN3JR/?mibextid=wwXIfr
    • Does any of you guys have instagram pages for your builds? Keen to see some Aussie builds. I still can't figure out how to post photos in here.
×
×
  • Create New...