blue-luck Posted July 16, 2010 Share Posted July 16, 2010 i have just finished building one of my supra's and have come across this problem.. i have a UK spec engine wiring loom and also a UK spec ECU running a j-spec TT engine. when i first put it all together in the car, i couldnt get it started, then i borrowed a UK resister pack for the injectors and connected that to the loom, and the car fired up, but it doesnt idle well, feels like its missing. Also have black smoke coming out the exhaust. i've checked all the plugs/coil packs and injectors, and everything seems to be working as they should. when i took this engine out of the car it was originally in, it ran perfect, no smoke, no missing..So i can only imagine its something to do with the loom?? or maybe its because UK's have 550 injectors and j-specs have 440's?? any advice would be appeciated thanks Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 bump.. Quote Link to comment Share on other sites More sharing options...
nevins Posted July 18, 2010 Share Posted July 18, 2010 Does the uk spec run the same electronic components to the J-spec, if not thats your problem. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 18, 2010 Share Posted July 18, 2010 Does the uk spec run the same electronic components to the J-spec, if not thats your problem. No, UK loom is slightly different... in at least that the UK has a MAF sensor amongst other things.... UK injectors are also 550s and not 440s.... Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 all i'm aware of is that the UK loom has a resistor pack, and some sort of vacuum thing that sits on the end of the inlet..but i have tried using both these parts and still no joy.. maybe and ecu or injector issue..?? or both?? Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 18, 2010 Share Posted July 18, 2010 You will need the MAF fitted in order to do the air measurement, as far as other sensors go I'm not 100% sure, if you are running UK ecu with resistor and UK injectors, that side SHOULD be okay. Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 when i connect the MAF sensor, the doesnt start, and even when i connect it while the car is running, it cuts off.. but when disconnected its ok.. i've got a j spec engine, so only 440's..maybe need the 550's.. is there a way to bypass the resistor pack and keep the 440's?? thanks.. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 18, 2010 Share Posted July 18, 2010 when i connect the MAF sensor, the doesnt start, and even when i connect it while the car is running, it cuts off.. but when disconnected its ok.. i've got a j spec engine, so only 440's..maybe need the 550's.. is there a way to bypass the resistor pack and keep the 440's?? thanks.. The 550's are meant for the UK ECU, so don't put the 440s in. With the MAF disconnected it is probably running in limp-mode.... Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 what if i was to put in a jap ecu? Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 18, 2010 Share Posted July 18, 2010 I don't mean this with any offence... but surely with the troubles you are having here that it would be best in the hands of someone knowledgeable? Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 I don't mean this with any offence... but surely with the troubles you are having here that it would be best in the hands of someone knowledgeable? i know.. but trying to do what i can..as i have a couple of supra's, so i can use parts off each of them as process of elimination, otherwise if i was to take it somewhere, i might have to keep buying different parts which might not help.. thanks.. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 18, 2010 Share Posted July 18, 2010 i know.. but trying to do what i can..as i have a couple of supra's, so i can use parts off each of them as process of elimination, otherwise if i was to take it somewhere, i might have to keep buying different parts which might not help.. thanks.. Can you not just use a j-spec loom, keep the 440s, no resistor, j-spec ecu then? Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 18, 2010 Author Share Posted July 18, 2010 Can you not just use a j-spec loom, keep the 440s, no resistor, j-spec ecu then? this is the main problem, left hand drive loom, and as far as i know all left hand drive looms are UK/Euro spec.. i was told that the resistor pack can be bypassed, but i'm not sure how.. the easiest thing would be to get some 550's but i need to find some first, so i thought if i can get it sorted by bypassing the resistor pack and putting in a jap ecu, and see if that works, as i can have a jap ecu anyway..just dont know how to bypass the resistor pack.. thanks Quote Link to comment Share on other sites More sharing options...
SBDJ Posted July 18, 2010 Share Posted July 18, 2010 This thread might be of some use for the resistor pack bypass: http://www.supraforums.com/forum/showthread.php?t=572776 If you're running the UK Spec ECU on a J-Spec you will definately need the 550s (simply bypassing the resistor pack is not enough - the UK ECU is designed for the bigger injectors which will result in you running lean and potentially killing your engine if you bypass and use 440s) the MAF and the resistor pack. Other differences such as the second O2 sensor and the EGR system can be ignored. Quote Link to comment Share on other sites More sharing options...
blue-luck Posted July 19, 2010 Author Share Posted July 19, 2010 This thread might be of some use for the resistor pack bypass: http://www.supraforums.com/forum/showthread.php?t=572776 If you're running the UK Spec ECU on a J-Spec you will definately need the 550s (simply bypassing the resistor pack is not enough - the UK ECU is designed for the bigger injectors which will result in you running lean and potentially killing your engine if you bypass and use 440s) the MAF and the resistor pack. Other differences such as the second O2 sensor and the EGR system can be ignored. thanks for that, but cant really figure it out.. just need a diagram of which wires to join.. thanks Quote Link to comment Share on other sites More sharing options...
bignum Posted July 20, 2010 Share Posted July 20, 2010 You don`t need to join any wires you just need 550 injectors. Quote Link to comment Share on other sites More sharing options...
SBDJ Posted July 21, 2010 Share Posted July 21, 2010 Thats what I was trying to say. UK-Spec ECU + UK-Spec Loom: Install resistor pack Install 550s Install MAF Do *not* try and run your car from the 440s with a bypassed resistor pack with a UK ECU. Quote Link to comment Share on other sites More sharing options...
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