HELLBOY666 Posted August 8, 2016 Share Posted August 8, 2016 Hi there been having a few issues with my n/a auto over fueling I've purchased a big single auto to use but really thinking of selling it and keeping my original n/a seems as it was my first supra but anyway AA recovered me the other week outside tesco main doors of all places lol he went through dizzy, leads, injectors and all connections and the only thing he could do was to disconnect fuel pump get me to start so it would clear the flood then he could connect bk up before it would run out of fuel but every time he tried it was cutting out like it was instantly flooding so after 5-6 attempts to clear injectors and connect pump bk up he gave up said let it run out of fuel with pump disconnected??? but car never stopped it was still running the whole time he towed me home he couldn't understand why and he reckons the fuel pump ecu could be faulty.....? it now runs ruff and idles at 1800-2500k and if i put throttle down it tries cutting out still so really stumped ? what do you guys think it would be much appreciated so I can fix it and sell my single thanks in advance [emoji106] Â Â Quote Link to comment Share on other sites More sharing options...
rider Posted August 8, 2016 Share Posted August 8, 2016 Have a look at the idle air control valve. Some recommend soaking it overnight in clean fuel and refitting to see if that cures the problem. Quote Link to comment Share on other sites More sharing options...
rider Posted August 8, 2016 Share Posted August 8, 2016 This may be worth a read:Â http://my.prostreetonline.com/2014/09/23/how-to-test-a-2jzge-iac/ Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted August 8, 2016 Share Posted August 8, 2016 What ECU is it running, if it's aftermarket have you tried hooking up a laptop and seeing what the fuel map is doing? Quote Link to comment Share on other sites More sharing options...
rider Posted August 8, 2016 Share Posted August 8, 2016 And this:Â http://www.mkivsupra.net/vbb/showthread.php?210956-How-To-Clean-Idle-Control-Valve-Cleaning-Aka-ICV-(IAC) Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 8, 2016 Author Share Posted August 8, 2016 Standard ecu and icv is nearly brand new so thats fine it's somewhere on fuel side would the fuel ecu be under footwear with other electrics lol  Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted August 8, 2016 Share Posted August 8, 2016 (edited) Ah so the overfueling is on the na, not the NA-T. There is no fuel ecu on an na. check your ignition timing, and whilst car idles unplug each injector individually, if you don't hear a difference when you unplug then you will have an issue with the fuel side. try and identify what cylinder issue is on, and if you can make the problem go to another cylinder or not Edited August 8, 2016 by Mike2JZ (see edit history) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 8, 2016 Share Posted August 8, 2016 The ECU temp sensor would be my bet. Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 8, 2016 Author Share Posted August 8, 2016 Ah so the overfueling is on the na, not the NA-T. There is no fuel ecu on an na. check your ignition timing, and whilst car idles unplug each injector individually, if you don't hear a difference when you unplug then you will have an issue with the fuel side. try and identify what cylinder issue is on, and if you can make the problem go to another cylinder or not Yeah sorry I'm driving a 2jz gte single auto at the min but it just don't feel like my car lol it wasn't my first supra so would like to just use the na and thanks ill try the injectors individually but I know the ones in middle are gonna be a pain lol  Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 8, 2016 Author Share Posted August 8, 2016 The ECU temp sensor would be my bet. We're would that be I've changed one down front of engine at bottom and that did nothing is there another one or have I changed the one for guage lol  Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 9, 2016 Author Share Posted August 9, 2016 has anyone had any problems with this before as this could be stuck....possibility???  Quote Link to comment Share on other sites More sharing options...
ripped_fear Posted August 9, 2016 Share Posted August 9, 2016 I have a spare one of those if needed I think somewhere  Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 9, 2016 Author Share Posted August 9, 2016 Oh ideal   Quote Link to comment Share on other sites More sharing options...
robby a Posted August 10, 2016 Share Posted August 10, 2016 Ah so the overfueling is on the na, not the NA-T. There is no fuel ecu on an na. check your ignition timing, and whilst car idles unplug each injector individually, if you don't hear a difference when you unplug then you will have an issue with the fuel side. try and identify what cylinder issue is on, and if you can make the problem go to another cylinder or not There is a fuel ecu on an na. It's in the same place as a tt. Left side of boot behind the trim. I doubt if that's the problem tho. My guess would be fuel pressure regulator. The part in the last pic   Quote Link to comment Share on other sites More sharing options...
ripped_fear Posted August 10, 2016 Share Posted August 10, 2016 Oh ideal  /QUOTE] Want me to try dig it out? Worked fine on removal, on my old car. Swapped to a chromed one  Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted August 10, 2016 Share Posted August 10, 2016 There is a fuel ecu on an na. It's in the same place as a tt. Left side of boot behind the trim. I doubt if that's the problem tho. My guess would be fuel pressure regulator. The part in the last pic  /QUOTE] Ah yes you are correct, didn't believe it till I checked the diagrams. Located in bottom right of image if you want to see it's location  Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 13, 2016 Author Share Posted August 13, 2016 Want me to try dig it out? Worked fine on removal, on my old car. Swapped to a chromed one /QUOTE] If that's cool bud let me know when you find it [emoji106] Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 13, 2016 Author Share Posted August 13, 2016 I've pulled each injector out one by one and they change idle as they should so not injectors. Â Â Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 13, 2016 Author Share Posted August 13, 2016 I had a pull on some sensors and I've noticed one I think its for water temperature is not connected it's underneath the front injector I plugged bk in but no change ??? Â Â Quote Link to comment Share on other sites More sharing options...
HELLBOY666 Posted August 13, 2016 Author Share Posted August 13, 2016 And I also had a play around with the dizzy I just pulled plug out which then engine wanted to die as should but gently put plug bk in not all the way wiggled it and got it to idle at 1300rpm not 2200 ????? should I look into dizzy side as I've also noticed a hole in my HT leads which has appeared from no where...  Quote Link to comment Share on other sites More sharing options...
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