jevansio Posted January 21, 2010 Share Posted January 21, 2010 Just wanted to post up something I found tonight. After my car has been off the road for ages (turbo upgrade) it's come to the time to put it on the road. Last couple of times I've fired it up it's been idling @ 2k rpm. Tonight I plugged the computer in (AEM) & had a look what was going on. First off I recalibrated the throttle (which was OK anyway) but didn't help. I started tweaking the idle % table to check it was controlling the valve (which it was). I had a hunt through the AEM docs & found a bit of info which said to get the best idle disable the idle control & get the car idling off the throttle (using the stop on the throttle itself). So I went to the throttle (while it was idling) & noticed that it wasn't sat on the stop (I could close the throttle even further - which dropped the rpms to what they should have been 1k). I played with the throttle a bit (squirting WD40) in an attempt to get it to snap back as far as the stop but it wouldn't. I also noticed when I snapped the throttle open quickly it didn't pickup instantly - a long standing issue on my car). So I started to wind the throttle stop open (and at the same time reduce the idle% in the map) so that more idle air was coming through the throttle & less through the idle valve. I got to the point where I got a perfect 1k idle. I just wanted to explain this, a) so proper techies can veryify my logic is correct & b) incase anyone else could benefit from it. I've basically ended up with: A rock steady idle (I guess because the throttle is letting a fixed amount of air through rather than the ECU trying to control it via a valve). A great throttle response, previously if a tapped the throttle revs would die for an instant before they picked up, now they don't. Might take it to work tomorrow now Link to comment Share on other sites More sharing options...
Geo Posted January 21, 2010 Share Posted January 21, 2010 Interesting dude, mine was doing the same thing. Just not got round to Plugging in the laptop and phoning Ryan to talk me through it. Although mine starts no problem now, but just dies if no throttle is given. A little throttle helps it, then it settles no problem. Link to comment Share on other sites More sharing options...
hodge Posted January 21, 2010 Share Posted January 21, 2010 Jay that's great mate. Looking forward to the mapping sesh Tuesday. Link to comment Share on other sites More sharing options...
jevansio Posted January 21, 2010 Author Share Posted January 21, 2010 Ryan will sort yours our defo George Cheers John I'll get a vid Link to comment Share on other sites More sharing options...
csa Posted January 22, 2010 Share Posted January 22, 2010 Nice work Jay...but did you try to start it again when had cooled of totally? ...like today? interested to know if the idle is still the same on a completely cold start Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Yip, took the car to work today, it's p1ssing down, I have no heaters, I've got my coat on to keep warm, but I'm loving it , idle has never been better Link to comment Share on other sites More sharing options...
Abz Posted January 22, 2010 Share Posted January 22, 2010 Nice work Jay...but did you try to start it again when had cooled of totally? ...like today? interested to know if the idle is still the same on a completely cold start Well done on posting this up Jay & CSA has a good point above. It seems like a common problem with Supra & idle issues. I found my throttle cable has a little slack which caused my RPM's to drop, tightened the slack & this solved the issue. With regards to plugging in a laptop (sorry to go a little off topic), what bits & bobs do you need? I presume a connector & some software, this would be quick interesting to make sure my dials are reading all information correctly. Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Cheers Abz I've got the AEM ECU which you can connect upto a laptop with a bog standard serial cable, & get the software from their website. It's specific to AEM though so this isn't possible on say a stock toyota ECU Link to comment Share on other sites More sharing options...
Abz Posted January 22, 2010 Share Posted January 22, 2010 Cheers Abz I've got the AEM ECU which you can connect upto a laptop with a bog standard serial cable, & get the software from their website. It's specific to AEM though so this isn't possible on say a stock toyota ECU Thanks Jay, good to hear you drove it in today! Once your driving you forget about the weather! Link to comment Share on other sites More sharing options...
jackso11 Posted January 22, 2010 Share Posted January 22, 2010 1k is quite a high idle, mine idles at around 600rpm when warm Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 It's loud, it lights the wheels up from a junction/roundabout start at about 1.5k but I love it A gem in a sea of sh1te Link to comment Share on other sites More sharing options...
Stevo Posted January 22, 2010 Share Posted January 22, 2010 Great to hear it is back on the road Jay and running better. Looking forward to some more north east meets - what with yours and Hodges once its done, it'll be proper mint! Link to comment Share on other sites More sharing options...
hodge Posted January 22, 2010 Share Posted January 22, 2010 Lmao at the sea of shite. Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Mine *could" idle there but it would be very lumpy, I don't think the 264 cams or the fact it's got a lightweight flywheel help in idling that low, I'm guessing yours is stock or BPU at most? Link to comment Share on other sites More sharing options...
deathmonkey Posted January 22, 2010 Share Posted January 22, 2010 It's loud, it lights the wheels up from a junction/roundabout start at about 1.5k but I love it A gem in a sea of sh1te http://www.mkivsupra.net/vbb/attachment.php?attachmentid=104072&stc=1&d=1264168207 Ace. I adore your Supra, those pics in your garage are . Yet again... I want a black respray... Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Many thanks DM, I want a black respray too the paint is buggared Link to comment Share on other sites More sharing options...
Kirk Posted January 22, 2010 Share Posted January 22, 2010 Well arnt you a clever bastard Glad to see its back in use now might actualy get chance to look at it proper this year! Link to comment Share on other sites More sharing options...
AlexJames Posted January 22, 2010 Share Posted January 22, 2010 see mine idles just below 1k and is quite lumpy, it pops quite a bit as well... It did idle lower but I adjusted the throttle stop a little. When it does pop you can actually feel (if you hand is by the exhaust) the extra gas coming out... any ideas? Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Cheers Alex Popping is prolly unburnt fuel, this could be caused by the engine over fuelling on idle, possibilities could be dodgy O2 sensor/water temp sensor. I'd start by checking for error codes Link to comment Share on other sites More sharing options...
michel lane Posted January 22, 2010 Share Posted January 22, 2010 well done jay ...you getting the car mapped on tuesday ? were is it getting done ?.... keep us updated please. Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 Cheers bud I'm going to make a call tomorrow & tell Ryan then, the car feels upto it, but I'm not sure if I am prepared to make the journey in a car with no heating, it's in Leeds, Will do Link to comment Share on other sites More sharing options...
Ryan.G Posted January 22, 2010 Share Posted January 22, 2010 Cheers bud I'm going to make a call tomorrow & tell Ryan then, the car feels upto it, but I'm not sure if I am prepared to make the journey in a car with no heating, it's in Leeds, Will do Northern Fairy! Link to comment Share on other sites More sharing options...
jevansio Posted January 22, 2010 Author Share Posted January 22, 2010 , I tell ya, it was so cold today I actually wore full length trousers Link to comment Share on other sites More sharing options...
AlexJames Posted January 23, 2010 Share Posted January 23, 2010 Cheers Alex Popping is prolly unburnt fuel, this could be caused by the engine over fuelling on idle, possibilities could be dodgy O2 sensor/water temp sensor. I'd start by checking for error codes Thanks mate Ill give that one a try Link to comment Share on other sites More sharing options...
Ian C Posted January 23, 2010 Share Posted January 23, 2010 Hang on hang on I've read what you put, let me see if I've got this right? 1) Your idle was too high 2) The throttle wasn't closing properly, it wasn't hitting the stop That's a good start, you've diagnosed your high idle, it's air coming past the throttle butterfly. Then: 3) So you wound the throttle stop screw UP to MEET the throttle butterfly?! 4) and ramped down the amout of air the idle control valve lets through to compensate? Dude, that's such a bodge! Why not find out why your throttle is sticking slightly open and fix that, so it shuts properly? And if your throttle is sticking for whatever reason, what if it then decides to stick even more open because of this? Danger danger. Or it fixes itself and closes properly? Stall stall. Not good my man. Also, snapping the throttle opening and experiencing an initial dip in revs is a sign of overfuelling or possibly the throttle closed switch in the TPS not being activated in the first place. -Ian Edit - actually the throttle sticking open is probably the cause of overfuelling and so forth as it isn't ever reaching the point on the sensor that tells the ECU it's shut and you can use the idle map now. Fix the sticky throttle, fix all your probs. I bet your overrun sounds epic though Link to comment Share on other sites More sharing options...
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