AlexM Posted December 29, 2009 Share Posted December 29, 2009 I bought my car from carl0s, which previously had some idling issues. I was of the understanding that everything was fixed before I bought it - but it seems not. The car idles at ~250rpm when hot, and struggles to keep itself alive (It 'hunts' and the rev counter fluctuates slightly). At SRR it refused to idle at all, with the car starting fine then the revs slowly dropping down to 0. LeeP had a look and adjusted the throttle stop to keep it running, and noticed that a second stopper was missing (I think Ryan mentioned it was just to take the slack out of the cable? Not sure I caught what he said correctly). Up until this point I had only noticed the problem after a long journey (30mins+, with some motorway running). I dropped it in to Silverstone Garage before Christmas, they reset the throttle stops to the correct position (and replaced the missing one), found the oil filter to be loose, so checked/tightened that and changed the oil, and refitted the upper radiator hose as it wasn't on correctly. They didn't notice the problem after that, having given the car some test drives and left it running for some time - so told me it was fixed. I drove it home, parked on my driveway... and the revs dropped to about 200. It now seems to have the issue more frequently, as even a 5 minute journey to the petrol station can result in the idle dropping right down.. The car will be going back to Silverstone Garage after the New Year as I don't have bits and pieces lying around to troubleshoot. However what should I/we be looking for? Carl (previous owner) seems to have spent considerable time and effort in trying to fix the problem, and all the obvious avenues look to have been investigated already.. Quote Link to comment Share on other sites More sharing options...
Wez Posted December 29, 2009 Share Posted December 29, 2009 Have you/anyone tried cleaning the idle control valve Quote Link to comment Share on other sites More sharing options...
Dragonball Posted December 29, 2009 Share Posted December 29, 2009 Have you/anyone tried cleaning the idle control valve I wouldn't worry too much - it will probably be something quite simple Quote Link to comment Share on other sites More sharing options...
AlexM Posted December 29, 2009 Author Share Posted December 29, 2009 Have you/anyone tried cleaning the idle control valve I believe the ICV has been both cleaned and replaced by Carl less than 4 months ago.. Just to add, there are no error codes (before it's asked ). Quote Link to comment Share on other sites More sharing options...
Guest SupraGTE Posted April 25, 2010 Share Posted April 25, 2010 di you ever solve this? Quote Link to comment Share on other sites More sharing options...
AlexM Posted April 25, 2010 Author Share Posted April 25, 2010 Unfortunately not, Lee P changed everything he could think of (bar the ECU) but I still have an intermittent idling problem. I'm trying to get hold of an ECU to test but no luck so far. Quote Link to comment Share on other sites More sharing options...
Guest SupraGTE Posted April 25, 2010 Share Posted April 25, 2010 same here, changed idle control valve, leads, cap, sparkplugs, adjusted tps and the problem wenayt away for a week , only short trip (5km) then today a long trip and now it is back Quote Link to comment Share on other sites More sharing options...
chrispot Posted April 25, 2010 Share Posted April 25, 2010 check for air leaks as this can cause idle problems when hot and not when cold and run ok, i had this problem on my sister inlaws car it was the inlet manifold gasket, seems the same probs as you are getting, hope you sort it. regards chris. Quote Link to comment Share on other sites More sharing options...
kaahari Posted April 25, 2010 Share Posted April 25, 2010 I had same broblems last summer, suddenly rpm ~250, mostly when driving in city (waiting for traffic lights... = idle). I cleaned idle control valve and it stopped How about that last thing, ecu? Isn`t the ecu controlling idle control valve? When i got airleak in intake manifold (leak in those small pipes between intake manifold and engine) rpm went ramdomly between 1500-2000rpm on idle. Quote Link to comment Share on other sites More sharing options...
Spike3.0 Posted April 25, 2010 Share Posted April 25, 2010 I've got the same problem too : ( Quote Link to comment Share on other sites More sharing options...
GreaseMonkey Posted April 25, 2010 Share Posted April 25, 2010 (edited) Just a thought, Poss might be the rubber injector seals in the cylinder head. Thinking could be that they are perished and opening up when hot?, making it run lean/ poor idle when hot. May be worth checking the spark plugs to see what state there in may give an indication as to what maybe at fault , i.e lean or rich. Although from what I've read there's no indication of misfire, so I may be wrong. Only other thought would be a wiring fault or MAP sensor. Had an IS200 which had similar symptoms due to an aftermarket piggyback ecu fitted, which tapped into the ECU end wiring for the MAP sensor / Temp sensor / Cam position. removed the aftermarket ECU and repaired the wiring back to OEM, ran just fine , but it's just a thought. Edited April 25, 2010 by GreaseMonkey (see edit history) Quote Link to comment Share on other sites More sharing options...
nigelboyne Posted April 26, 2010 Share Posted April 26, 2010 I had same broblems last summer, suddenly rpm ~250, mostly when driving in city (waiting for traffic lights... = idle). I cleaned idle control valve and it stopped How about that last thing, ecu? Isn`t the ecu controlling idle control valve? When i got airleak in intake manifold (leak in those small pipes between intake manifold and engine) rpm went ramdomly between 1500-2000rpm on idle. any pics of were this is and how to clean it pls Quote Link to comment Share on other sites More sharing options...
Lude Posted April 26, 2010 Share Posted April 26, 2010 i had this on my 300zx for a while, car just woundt idle at all after i transplanted the engine into another shell. i knew the ins & outs of the engine, coudnt see/find any vacuum leaks, it would idle fine when cold, but not when warm (idle valvs have cold & hot part to them, which is why idles high when cold) i removed the valve, cleaned it, re-fitted it. still nothing. i fixed the idle problem......... by just turning up the idle screw! thats what its there for at the end of the day! just turn it up, and not just a little tiny bit, give it a few good turns when the cars warm, then just adjust bit by but until idles on about 900rpm Quote Link to comment Share on other sites More sharing options...
BABZ988 Posted September 2, 2010 Share Posted September 2, 2010 hi i have nearly the same probleme ok when cold , but hesitating (200?250 rpm) and even dies in traffic or after high rpm drop (like when passing gear slowly; 4000rpm to ... 0 )its awfull have already cleaned the iacv but it come back ; will check for vacuum leaks! did you solve yours?? Quote Link to comment Share on other sites More sharing options...
Guest Dasher220 Posted October 4, 2010 Share Posted October 4, 2010 Can someone post a pic of where the IACV is, i have the same problem and have been told to clean this valve but ive got no idea where it is. Quote Link to comment Share on other sites More sharing options...
Mcgoo Posted October 4, 2010 Share Posted October 4, 2010 Can someone post a pic of where the IACV is, i have the same problem and have been told to clean this valve but ive got no idea where it is. http://www.mkivsupra.net/vbb/showthread.php?t=210956 Quote Link to comment Share on other sites More sharing options...
Guest Dasher220 Posted October 4, 2010 Share Posted October 4, 2010 Sorry, should have mentioned ive got a 2JZGE, i started a thread on the australian forums with some pics. Situation might make more sense this way http://www.supraforums.com.au/forum/showthread.php/65291-Stalling-Problem Quote Link to comment Share on other sites More sharing options...
AlexM Posted October 7, 2010 Author Share Posted October 7, 2010 Solved the problem but I don't know what the cause was - sorry. Pretty much everything that could cause the problem was changed! Quote Link to comment Share on other sites More sharing options...
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