Guest IrishJeff Posted November 9, 2011 Share Posted November 9, 2011 Hey guys I have an auto BPU 94 Supra TT and have been having this problem for the past few months. Let me try to explain... When I start up the car with a cold engine and its hot outside it will usually stall on first try. 2nd try it fires up fine. Then, even after letting it idle for a couple of minutes, if the engine is still not at operating temp it will bog down terribly when I start to drive in 1st gear. I have trouble making it out of the parking lot as I can barely reach 2k rpm and it feels as if it will stall at any moment. No matter how much throttle I give it the rpms barely climb but I hear boost build. Feels like I'm towing an elephant. After a minute or two of driving, once I reach close to operating temp suddenly I'm able to drive fine. As if it never happened. Pulls great, runs & idles smooth. Starting the car with a warm engine is fine too. If it is cool outside (I'm in South Florida so it never gets cold) I don't have this problem with a cold engine. Only when its quite hot out. Any ideas on things I can look at? I've been trying to figure this out for months, and no one I've asked has a clue. I'm not trying to gun it out of the parking lot from a cold start or anything... I just want to be able to pull out into the road at speeds greater than 10mph. Thanks! Jeff Quote Link to comment Share on other sites More sharing options...
dude Posted November 9, 2011 Share Posted November 9, 2011 I would try changing the temp sender unit that works the cold start. this sounds like its playing up, when it holds back does it black smoke or is clean from the tailpipe. Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 10, 2011 Share Posted November 10, 2011 I'm not certain but I believe there is NO smoke. Another weird detail I forgot is when the car is bogging down when slowing driving off, if I try to give it some more throttle to wake it up boost will build but the car doesn't go any faster, and sometimes the BOV will suddenly blow-off quickly without letting off the pedal. I'm talkin 1st gear 2k rpm. After some more feathering of the gas the car will start to act normal and let me rev higher. Quote Link to comment Share on other sites More sharing options...
dude Posted November 10, 2011 Share Posted November 10, 2011 I'm not certain but I believe there is NO smoke. Another weird detail I forgot is when the car is bogging down when slowing driving off, if I try to give it some more throttle to wake it up boost will build but the car doesn't go any faster, and sometimes the BOV will suddenly blow-off quickly without letting off the pedal. I'm talkin 1st gear 2k rpm. After some more feathering of the gas the car will start to act normal and let me rev higher. I would still put the new temp sender in it. Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 10, 2011 Share Posted November 10, 2011 (edited) I'll try that, thanks! Where is the temp sender located (that works the cold start as you said)? Edit: Is this it? 18. Edited November 10, 2011 by IrishJeff (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 10, 2011 Share Posted November 10, 2011 Does it show the traction control warning light? Get the fault codes out of it, my bet is the TC control motor is holding the TC throttle butterfly closed when it shouldn't. If I am right send me a decent Guinness with a shamrock done on the head It could still conceivavbly be an ecu temp sender issue, but the cause of your issue in post #3 definitely sounds like the secondary (TC) butterfly is sticking partly shut. Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 10, 2011 Share Posted November 10, 2011 TC light does not come on (I usually turn it off when I start the car anyway). Not sure if it is TC related since the symptoms also include a rough start and terrible idle until warm. Quote Link to comment Share on other sites More sharing options...
dude Posted November 11, 2011 Share Posted November 11, 2011 Does it show the traction control warning light? Get the fault codes out of it, my bet is the TC control motor is holding the TC throttle butterfly closed when it shouldn't. If I am right send me a decent Guinness with a shamrock done on the head It could still conceivavbly be an ecu temp sender issue, but the cause of your issue in post #3 definitely sounds like the secondary (TC) butterfly is sticking partly shut. Thats pissabolity as well, top of the class CW. Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 14, 2011 Share Posted November 14, 2011 Hey dude, any chance you would know the part(s) I'd need to replace the temp sender? Thanks! Quote Link to comment Share on other sites More sharing options...
dude Posted November 14, 2011 Share Posted November 14, 2011 I will try and find out for you dude. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 14, 2011 Share Posted November 14, 2011 89422-35010 water temp sender for ecu. Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 15, 2011 Share Posted November 15, 2011 (edited) 89422-35010 water temp sender for ecu. Thanks! I hope this $50/£30 shot in the dark works. Edited November 15, 2011 by IrishJeff (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 21, 2011 Share Posted November 21, 2011 No change with the new temp sender. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 21, 2011 Share Posted November 21, 2011 Remove the 4 screws holding the traction control throttle motor on to the throttle body, see if the geared wheel that drives the throttle turns slightly notchily, but easily. If it's stiff it has probably had water ingress and is knackered. You need to find the cause rather than just nail on new bits, that's the prerogative of main dealers with shelves full of parts to "try" Quote Link to comment Share on other sites More sharing options...
Guest IrishJeff Posted November 21, 2011 Share Posted November 21, 2011 Thanks Chris, I'll try that next. Quote Link to comment Share on other sites More sharing options...
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