FOSTA Posted February 5, 2011 Share Posted February 5, 2011 car: mkiv supra 1993, auto , Jap import, non turbo fitted with T-61 turbo kit so NA-T everything else totally stock! i noticed last week when checking the ground on the igniter that when i started the car up from warm the wideband would go mega lean like 17's and the rev counter would jump up and down ever so slightly with the idle sounding a bit lumpy! but if i drive it for a few mins and stop the idle is perfect! and the wideband jumps around between the normal 14.6-15.3 (well i think thats normal) and it will stay perfect untill i shut the car off and start it back up again! it dosnt seem to do it from cold but from cold the revs jump up to around 1800-1900rpm for a few mins then come back down to just under 1000rpm but i was told a while ago this was normal? and its always done it since i have owned it! but anyways i never really start it from warm so i only just noticed this! could it be somthing ive upset when fitting the turbo kit? or just somthing thats gone bad by its self? also what would be causing this problem? i just want this car 100% ;-) Quote Link to comment Share on other sites More sharing options...
FOSTA Posted February 5, 2011 Author Share Posted February 5, 2011 ok ive just bridged te1 and e1 and done a quick check . the ecu light is blinking constantly and in an even pattern so i guss there is no fault codes to be read! also i just started the car from cold: .from cold the revs jumped stright up to 1600rpm then droped to around 700-800rpm in around 5mins and sounded smooth and quiet! ;-) .from cold the wideband goes mega rich like in its 10's and 11's untill the revs drop to around 1000rpm! the it goes into the 13's and after the 5 mins when the revs drop to around 700rpm-800rpm it goes to around 13.9-14.00 but if i drive it then let it idle the wideband goes around 14.6-15.3 and if i switch the car off and start it up again within 30mins the idle will go slightly ruff and mega lean 17's ? Diagnostic Codes When things go wrong with engine components, sensors, etc. there is a chance that it's going to be a failure mode that your ECU will recognise. Usually, you'll know something has happened because the MIL lights up. Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted February 5, 2011 Share Posted February 5, 2011 Be an air idle control valve fault. Mine was sticky on and off for a while. Quote Link to comment Share on other sites More sharing options...
FOSTA Posted February 5, 2011 Author Share Posted February 5, 2011 Be an air idle control valve fault. Mine was sticky on and off for a while. oh cool mate! i hope its just somthing like that! where is it located? and how hard is it to remove and clean? or is it just worth getting a new one? cheers Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted February 6, 2011 Share Posted February 6, 2011 Its on the side of the throttle body. From memory its only a couple of 10 mm bolts holds it on. Quote Link to comment Share on other sites More sharing options...
FOSTA Posted February 6, 2011 Author Share Posted February 6, 2011 Its on the side of the throttle body. From memory its only a couple of 10 mm bolts holds it on. ok ill have alook at that thanks ;-) Quote Link to comment Share on other sites More sharing options...
Rinus Posted February 6, 2011 Share Posted February 6, 2011 Maybe its a little bit more difficult, cause there is running coolant trough this control valve... I bypassed it, so no problems for me anymore... Don't think you can clean it very easy with these hoses still connected... Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted February 8, 2011 Share Posted February 8, 2011 PFF its at the top of the engine so how much coolant will you lose? A quick replacement will see off not alot of coolant and return the car to a running right condition. Thats if its the idle control valve. Quote Link to comment Share on other sites More sharing options...
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