Parry_10 Posted March 25, 2011 Share Posted March 25, 2011 (edited) well i officially hate my supra and im soo close to just giving up with it its just problem after problem so if this idle problem doesnt get sorted soon im getting rid of it! the idle is fine when cold but when hot it idles too high around 1400rpm usually sometimes higher so far ive: removed the throttle body cleaned it up and the butterfly removed the icv stripped it down and cleaned it up when I take the hose off the icv and block the icv off with my finger the revs drop down to what seems normal.... also it has flagged up one fault code which is 51 heres the link- http://www.mkivsupra.net/vbb/attachment.php?attachmentid=13924&d=1112558346 if anyone can give me some more info on this fault code and how it could be causing my idle problem that would be good... does anyone have any ideas im really losing my patience with this car now! Edited March 25, 2011 by Parry_10 (see edit history) Quote Link to comment Share on other sites More sharing options...
aman00123 Posted March 25, 2011 Share Posted March 25, 2011 Have you tried coil pack clips and the coil packs themselves? Don't give up bud, once you crack it and take it out for a drive you'll be happy with your car again Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 coil packs are fine and clips are new mate Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 just took the icv off again and its position has changed so im guessing the icv is fine as it is operating and must be getting a signal? need some more info on this code 51 and how it would cause idle issues if anyone has any knowledge on it cheers Quote Link to comment Share on other sites More sharing options...
Graham S Posted March 25, 2011 Share Posted March 25, 2011 You checked for a air leak? Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 yeh I cant hear or see an air leak anywhere... i dont think it is a leak as that fault code 51 has come up so maybe that has something to do with it Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 Didn't coolant temp sensor cause funny idle conditions when it goes? Quote Link to comment Share on other sites More sharing options...
hodge Posted March 25, 2011 Share Posted March 25, 2011 Didn't coolant temp sensor cause funny idle conditions when it goes? It certainly does Jay. I had that very same problem with my blue supra. The car overheated and the head ended up lifting off the gasket and I lost compression. The idle was rough as hell. I was checking everything else and before I knew it it cut out n wouldn't start again. Quote Link to comment Share on other sites More sharing options...
dude Posted March 25, 2011 Share Posted March 25, 2011 Cleaning the throttle body is prob the worst thing you could have done, if its worn at all that could now be your problem, Skylines do this a carbon deposit is what makes the seal on these worn throttles as soon as you clean them there is an air gap and it will never idle at the correct speed again. Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 (edited) Cleaning the throttle body is prob the worst thing you could have done, if its worn at all that could now be your problem, Skylines do this a carbon deposit is what makes the seal on these worn throttles as soon as you clean them there is an air gap and it will never idle at the correct speed again. If it ides fine when cold I think it's highly unlikely that a worn throttle is to blame for his issue? Also where does this carbon buildup occur, around the edge of the throttle butteryfly? And why carbon? Surely the intake is seeing pure air? Edited March 25, 2011 by jevansio (see edit history) Quote Link to comment Share on other sites More sharing options...
Slippery Posted March 25, 2011 Share Posted March 25, 2011 Don't know if this helps but I have had this problem on a couple of my cars before, although they were not supras. It turned out to be the auxiliary air valve. Also the engine temperature sensor for the engine management can have that effect aswell . Quote Link to comment Share on other sites More sharing options...
dude Posted March 25, 2011 Share Posted March 25, 2011 If it ides fine when cold I think it's highly unlikely that a worn throttle is to blame for his issue? Also where does this carbon buildup occur, around the edge of the throttle butteryfly? And why carbon? Surely the intake is seeing pure air? Just saying that cleaning throttles on skylines is a big no no, yes it should see clean air but when was the last time you saw a turbo car with a clean inlet ??? there is always oil and other crap, still obviously it won't be that so i'll bow out now and go fit the 2 skyline throttles that need replacing due to cleaning. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 engine temperature is normal no overheating, and if it was an engine temp sensor or coolant temp sensor that would flag up the fault code for it wouldnt it? mine has only flagged up code 51 as for cleaning the throttle body/butterfly i was told to do that by a few people including chris wilson so thats the reason i did that Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 25, 2011 Share Posted March 25, 2011 I suspect that someone has buggered around with the throttle settings in an effort to cure this previously, i would reset this with the manual set up procedure, also check that the dashpot/damper isn't sticking. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 it was fine before I had the boost controller fitted and the car dynoed though? and is there a link to this set up procedure and where is the dashpot/damper mate Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 engine temperature is normal no overheating, and if it was an engine temp sensor or coolant temp sensor that would flag up the fault code for it wouldnt it? mine has only flagged up code 51 as for cleaning the throttle body/butterfly i was told to do that by a few people including chris wilson so thats the reason i did that Does the ECU use the same sensor as the gauge? I always thought they used different sensors? Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 yeh they do use different sensors im not really understanding what your trying to say? the guage is the one with 1 wire and the ecu is the one with 2 wires i believe Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 Just saying that cleaning throttles on skylines is a big no no, yes it should see clean air but when was the last time you saw a turbo car with a clean inlet ??? there is always oil and other crap, still obviously it won't be that so i'll bow out now and go fit the 2 skyline throttles that need replacing due to cleaning. Are Skylines ITBs? So if it's the shaft that leaks on them they'd be suffering boost leaks too? Feckin Taxis Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 yeh they do use different sensors im not really understanding what your trying to say? the guage is the one with 1 wire and the ecu is the one with 2 wires i believe I'm trying to say your dash maybe showing a fine coolant temp, but your ECU could be seeing a messed up value which is causing it to send your ICV all over the place Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 thats true mate but if that was the case wouldnt I get a coolant temp sensor fault code? Quote Link to comment Share on other sites More sharing options...
jevansio Posted March 25, 2011 Share Posted March 25, 2011 thats true mate but if that was the case wouldnt I get a coolant temp sensor fault code? Dunno, I just know from previous threads on here that idle issues that don't manifest themselves until the engine is hot can be related to dodgy ECU coolant temp sensors Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 ok is that the one sensor next to the gauge sensor? sits kind of above the alternator, also dont know if this has anything to do with it but when i put the heating on its never hot its only ever warm or cold...could a faulty coolant temp sensor cause this? Quote Link to comment Share on other sites More sharing options...
nevins Posted March 25, 2011 Share Posted March 25, 2011 Get the car running, find a flammable aerosol spray like carb cleaner, now spray around the inlet and anything that could be leaking, if it is then the revs will pick up and you have an air leak. Quote Link to comment Share on other sites More sharing options...
nevins Posted March 25, 2011 Share Posted March 25, 2011 ok is that the one sensor next to the gauge sensor? sits kind of above the alternator, also dont know if this has anything to do with it but when i put the heating on its never hot its only ever warm or cold...could a faulty coolant temp sensor cause this? sensor will not alter the heaters mate that would be down to a faulty thermostat or air lock. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 already tried spraying brake cleaner on all the hoses when engine is running no rev increase, also the car is using too much fuel, fitted a new o2 sensor so it cant be that(fitted new o2 sensor after the idling problem started Quote Link to comment Share on other sites More sharing options...
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