Jump to content
SAU Community

Recommended Posts

Hi everyone,

My mate has an r32 gtst (auto) and its been playing up recently I was wondering if someone might know the problem.

Symptoms:

Irrattic Idle will be anywhere between 1600 and 400 it also stalls sometimes

The computer seems to be in limp mode when driving can't rev past 2500-3000, however you can free rev the car to redline no problems and sometimes

in 1st it will allow you to rev over 3000rpm its weird.

I checked the error codes on the computer and it did come up with 12 (MAF) but this could be because at one stage the car was running and I unplugged the AFM.

After it gave the error code of 12 I tried turning the car off (from on not started) again and then on to check the codes one more time and got 55 (no error) so we tried to

swap the afm over from my 32gtr but it seems to be a smaller diameter not sure why but yeah I'm assuming the reading would be different because of the size. So that

didn't really work

Maybe could I borrow someones AFM if they have time to check that is definetly not the problem.

Thanks in advance

Andrew.

Link to comment
https://www.sau.com.au/forums/topic/346639-rb20det-problems/
Share on other sites

Hmmm so might be the o2 sensor ey, might be worth a look :) thanks for the advise.

The car should idle and run even with a stuffed o2 sensor. I drove mine for a week with the o2 sensor unplugged and the only difference I noticed was a slight increase in fuel consumption.

Yeah I have just been reading a thread about the o2 sensors so maybe I'll unplug it and see if anything different happens just to check. This is really annoying me and because its not my car I dont wanna go spending hundreds replaceing afms and o2 sensors if they are not the problems

The problem you describe sounds 100% like afm. I can replicate this problem by disconnecting the afm. I highly doubt it's the o2 sensor, you'll find your car should run fine without it albeit higher fuel consumption. You'll eventually get the check engine light 2 to 10 minutes after the car is started when the o2 is disconnected.

Edited by lukebaldan

I checked the error codes on the computer and it did come up with 12 (MAF) but this could be because at one stage the car was running and I unplugged the AFM.

Then reset the ECU and see what error codes come up.

Could be a sticking AAC valve causing the idle hunting.

  • Like 1

Yeah I might give that a go tonight, reset the ecu then check for error codes again :-) Hopefully I get 12 again. If this is the case is there anyone who can come around and let me swap there one in to confirm that, that is the problem? I guess it would have to be from a gtst because the one from my gtr is a smaller diameter afm so i'm guessing it would send the wrong signals to the ecu.

Update: so I disconnected the battery to reset the ecu over night ... re-connected and tried to start the car all it does is crank over, doesn't even fire up :S so now I have nfi. If it was the AFM that was on the blink the car should still start right?

Another Update: Well seems that if i spray carbie cleaner into the throttle body the car will fire up on the fumes, which lead me to believe it was the fuel system. I found where it plugs into the fuel pressure reg and unplugged it before that, when i am cranking the car there is no fuel coming out of the lines. So either the fuel filter is blocked or the fuel pump is knackered. :( I think I might be getting somewhere now tho :)

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

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...