BaileySupra Posted February 24, 2013 Share Posted February 24, 2013 hi, i have a small problem and that is my NA supra is idling too fast. if i rev it a little when its cold and then let it tick over again it ticks over at 2.5k but surges quite badly like it drops to around 1k then revs back up to around 2-2.5k. when they car is warm the car ticks over between 1.5k - 2k. when i turn the engine off and restart it it ticks over at normal rpm around 800-900rpm but then when i start driving it goes back to idling fast, what could this be its extremely annoying!! (P.S i hope you guys could understand my write up haha) Quote Link to comment Share on other sites More sharing options...
Westy Posted February 24, 2013 Share Posted February 24, 2013 Idle control valve may need cleaned/replaced...there is a guide on here I'm sure. Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 26, 2013 Author Share Posted February 26, 2013 I've cleaned it, but it looks brand new? Any other ideas? Quote Link to comment Share on other sites More sharing options...
Nick85 Posted February 26, 2013 Share Posted February 26, 2013 How did this come about? Has it gradually gotten worse over time? Was it one day fine and the next day behaving like this? Did you do anything to the car before this started happening? Could it be an air/vacuum leak? Knackered ICV? Did you touch/removed & replaced the TPS? Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 27, 2013 Author Share Posted February 27, 2013 Well I bought the car like this, the throttle cable was slack and that is what he blamed it on. So I adjusted the cable but the high idle continued. Also I've found that when I rev the car when idling the idling will drop slightly and then tick over a little bit slower. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted February 27, 2013 Share Posted February 27, 2013 Similar to my problems, have you checked error codes? I'm having a TPS/circuit problem at the moment. Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 27, 2013 Author Share Posted February 27, 2013 No I haven't, nothing has come up on the dash. I've altered the TPS it slowed it down but not enough and then it just went back to normal. I'm tempted to try replacing the TPS sensor and seeing if that does anything Quote Link to comment Share on other sites More sharing options...
Nick85 Posted February 27, 2013 Share Posted February 27, 2013 A new TPS from Toyota is around £100 + VAT. A second hand one will always be a gamble. I wouldn't be replacing parts until you know which part is at fault. (You could spend alot of money and still have the same problem). Have you checked for air leaks on the intake manifold, etc? How's you oil level? As for lights not coming up on the dash, bulbs could have died or been removed to hide faults. I would personally disconnect the battery to clear all codes the reconnect it and go for a long drive so the ecu can relearn its info and gain any fresh fault codes. Quote Link to comment Share on other sites More sharing options...
DodgyRog Posted February 27, 2013 Share Posted February 27, 2013 Just as a "it costs nothing to try" Disconnect the battery for 10-15 mins, then reconnect and leave the car to idle for 5-10 mins It blanks the ECU to a base map and it will then relearn, it might not work, but it's free Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 27, 2013 Author Share Posted February 27, 2013 The only thing with disconnecting my battery, would I then have any issues with my alarm? Quote Link to comment Share on other sites More sharing options...
Nick85 Posted February 27, 2013 Share Posted February 27, 2013 The only thing with disconnecting my battery, would I then have any issues with my alarm? Shouldn't be any issues. I've never had any issues with mine. Quote Link to comment Share on other sites More sharing options...
DodgyRog Posted February 27, 2013 Share Posted February 27, 2013 The only thing with disconnecting my battery, would I then have any issues with my alarm? As long as the Alarm is off when you disconnect it should not be an issue at all, otherwise you are going to have major issues if you ever want to do any major work on the car Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 27, 2013 Author Share Posted February 27, 2013 Right cheers guys ill try that then Quote Link to comment Share on other sites More sharing options...
BaileySupra Posted February 27, 2013 Author Share Posted February 27, 2013 Right so I've reset the ecu, no faults have come up but the idling problem has settled down a little bit, instead of it idling at 1.5/2k it's not just above 1k, but it slowly descends from 1.5k to 1k. I shall upload a video of it doing it tomorrow. Quote Link to comment Share on other sites More sharing options...
j-a-y Posted March 4, 2013 Share Posted March 4, 2013 hi ,this sound like something similar to mine at the moment and iv tryed some of the above like, disconnecting battery 10- 15 mins to reset ecu; cheak air leeks: clean up idle speed control valve plus i have a spare one i tryed. it did help doing some of thos things but not solved it yet so i think il cheak for wirer connection earthing points over the weekend.... Quote Link to comment Share on other sites More sharing options...
straightsix Posted March 4, 2013 Share Posted March 4, 2013 Never had this issue on a Supra myself but did have a similar issue on a different car - turned out to be the coolant sensor. It wasn't registering it was getting warm so kept the idle speed and fueling up as if the engine was cold. Just a wild stab in the dark seeing as the usual suspects have already been covered. Also - although the IACV has been cleaned, it may still be worth swapping for a known good one to see if the unit is actually faulty. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted March 21, 2013 Share Posted March 21, 2013 I'm having the same problem here folks did you find what was at fault? I'm suspecting my issue is with the icv? If I use clarksons trick And give it a little tap, the rpm drops back to normal? Car was running fine until I removed the tb? Quote Link to comment Share on other sites More sharing options...
straightsix Posted March 21, 2013 Share Posted March 21, 2013 I'm having the same problem here folks did you find what was at fault? I'm suspecting my issue is with the icv? If I use clarksons trick And give it a little tap, the rpm drops back to normal? Car was running fine until I removed the tb? Did you do anything with the throttle cable when the TB was removed? Is the cable adjusted properly? Also, did the TB gasket get damaged when you removed/replaced the TB? Quote Link to comment Share on other sites More sharing options...
msmile Posted March 21, 2013 Share Posted March 21, 2013 I just solved this problem on my NA just bought. There were 2 problems at once: 1. Air leak in the intake system. 2. Distributor cap/rotor and spark plugs. To check the 1st one you can to buy an "Easy engine start" or "Cold start" spray from Halfords or petrol station (3-4 pounds) and spray it on the engine idling everywhere possible around the inlet manifold. If you feel the engine changing revs while spraying, try to find out exact place where revs are changing most when spraying and youll find the leak. It was a vacuum hose broken in my case, in some other cases theres an air leak through one of the inlet gaskets. After fixing this revs gone down from 2k to 1.2k. As it appeared bad ignition can also cause increase in revs, so i swapped Distributor cap/rotor and spark plugs from my other supra and it finally started to idle as it should. I hope it helps! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 21, 2013 Share Posted March 21, 2013 Air leak, idle control valve problem, ECM to idle control valve wiring problem, maladjusted throttle pot, worn throttle body, faulty ECM.. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted March 21, 2013 Share Posted March 21, 2013 I think the throttle cable is ok, I cleaned the icv yesterday the best i could without removing the tb and gave it a run this morning, now the revs are not sticking as much but are still higher than normal, I will try the cheaper options first ie clean tb and icv properly this time and replace the gasket that's in desperate need of replacing!! Where can I get one of these from? Quote Link to comment Share on other sites More sharing options...
Nick85 Posted March 21, 2013 Share Posted March 21, 2013 I think the throttle cable is ok, I cleaned the icv yesterday the best i could without removing the tb and gave it a run this morning, now the revs are not sticking as much but are still higher than normal, I will try the cheaper options first ie clean tb and icv properly this time and replace the gasket that's in desperate need of replacing!! Where can I get one of these from? Pop along to your local Toyota dealer they aren't that expensive. Throttle body gasket is £3.67 + Vat. Manifold gasket is £10.65 + vat and the final gasket is £9.14 + vat Quote Link to comment Share on other sites More sharing options...
RobUK Posted March 21, 2013 Share Posted March 21, 2013 I think the throttle cable is ok, I cleaned the icv yesterday the best i could without removing the tb and gave it a run this morning, now the revs are not sticking as much but are still higher than normal, I will try the cheaper options first ie clean tb and icv properly this time and replace the gasket that's in desperate need of replacing!! Where can I get one of these from? Have you tried adjusting the throttle cable? Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted March 22, 2013 Share Posted March 22, 2013 i did loosen off the securing nut for the throttle cable but it didnt help, after resetting the ecu and clocking a few miles its stopped sticking, but idles at 1k so at the weekend i will replace the tb gasket and give it a good clean again, this time cleaning out the channel where the idle control valve fits. where can i find the torque settings? Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted March 31, 2013 Share Posted March 31, 2013 Can anyone confirm if the throttle cable looks ok? There's abit of plastic showing is this normal? I cleaned the tb again which has completely cured the sticking idle valve but it still idles at 1k?? The only things I have done to the car is mount a fmic since I'm going na-t but can't see how that could be the problem. Quote Link to comment Share on other sites More sharing options...
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