HeathGTST Posted December 19, 2004 Share Posted December 19, 2004 Fellas, Yesterday was quite hot in melbourne and my engine temp reached 86c which is warmish but the car still ran fine... Today when i went to drive my car the idle is very irratic. when the engine is at operating tempreture the engines idle goes from around 900-1400rpm by itself... Constantly goes up and down. I have checked most of the electrical connections and most of my hose connections and yet and still have no cure.... Any help would be much appreciated i have a 96 mdl r33 turbo manual with a Power FC computer Cheers Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/ Share on other sites More sharing options...
rutelz Posted December 19, 2004 Share Posted December 19, 2004 Hey mate, Not sure whether i completely understand your problem, but it sounds like a similar problem I had... I suggest you check the harness running in2 the ECU, because that was my problem... The RPM signal was cut, and re-soldered but a very average effort so when it got warm the wire's would expand then when it cooled it would only contact every so often so it would be unstable. The wire colour is yellow with a blue strip running through it... Hope this helps but not too sure because I'm not sure whether the harness was changed with the Apexi FC... Goodluck mate, Let me know how you go! Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1128796 Share on other sites More sharing options...
HeathGTST Posted December 19, 2004 Author Share Posted December 19, 2004 the problem seems to be related to engine temp... car idles fast when its cold because its on the cold start procedure, when the engine temp gets to 60c the engine note changes a little and as soon as it hits 68c the idle goes all funny.... from 1200-1600rpm.... up and down up and down constantly.... When I turn the car off and restart it straight away at operating tempreture the engine sits on 2000rpm for around 5 seconds and the drops to 1200rpm and revs up to 1600rpm up and down.... Its really giving me the sits... It didnt do it yesterday but today i did.... Very very strange Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1128902 Share on other sites More sharing options...
rutelz Posted December 20, 2004 Share Posted December 20, 2004 yeah sounds very familiar... have u checked the loom running to the ECU yet? Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1129946 Share on other sites More sharing options...
blind_elk Posted December 20, 2004 Share Posted December 20, 2004 Try cleaning the AAC valve. Check the TPS throttle-closed position. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1130001 Share on other sites More sharing options...
HeathGTST Posted December 21, 2004 Author Share Posted December 21, 2004 problem solved.... AAC valve was jamed. cleaned it out with a special cleaner... bolted it back on and away she goes very happy Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131115 Share on other sites More sharing options...
RB30-POWER Posted December 21, 2004 Share Posted December 21, 2004 I would consider 86-92degC normal operating temp for these motors. 86 cruising 92 idle with air-con on + hot day. If its way lower than that, you are going to get bad economy and accelerated engine wear. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131244 Share on other sites More sharing options...
HeathGTST Posted December 21, 2004 Author Share Posted December 21, 2004 how do i increase the engine temp then? Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131334 Share on other sites More sharing options...
The Dan Posted December 21, 2004 Share Posted December 21, 2004 Put a different thermostat in it. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131358 Share on other sites More sharing options...
RB30-POWER Posted December 21, 2004 Share Posted December 21, 2004 Make sure that you have a fully functioning genuine Nissan Thermostat. Rated at 76.5degC (stamped on it) $30 from Nissan if thats the problem. The thermostat is designed to commence opening at 76.5degC and be fully open at approx 90degC. So yeah, the temp should be within this mark when at operating temperature. Also with age the Clutch Fan can be engadged all the time, and not allowing the motor to warm up properly. The clutch centre is viscous type, and should only tighten up when its warm. And the last thing, make sure the guage is right that you have the temp reading from. Does it use an independant sensor or is it piggybacked to the factory sensor? If its piggybacked you can get wrong readings. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131379 Share on other sites More sharing options...
RB30-POWER Posted December 21, 2004 Share Posted December 21, 2004 3lit3 Fors3, lol at that signature Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1131388 Share on other sites More sharing options...
R31 POWER Posted December 26, 2004 Share Posted December 26, 2004 I would consider 86-92degC normal operating temp for these motors.86 cruising 92 idle with air-con on + hot day. If its way lower than that, you are going to get bad economy and accelerated engine wear. Is that for a RB25det only? because my R32 RB20det sits on 78degC for normal driving and the highest ever temp was 86degC in stinking hot heat with a full car load. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1136579 Share on other sites More sharing options...
RB30-POWER Posted December 26, 2004 Share Posted December 26, 2004 Thats a general rule of thumb for most motors. 78degC sounds preety fine to me. I mean if it were lower than the thermastat temperature then it would be a problem. i.e If you said it was running at 50degC all the time, then there would be a problem. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1136667 Share on other sites More sharing options...
R31 POWER Posted December 26, 2004 Share Posted December 26, 2004 Ok sweet and thanks for the info. Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1136930 Share on other sites More sharing options...
NismoR34 Posted January 13, 2005 Share Posted January 13, 2005 Try cleaning the AAC valve. Check the TPS throttle-closed position. sorry to dig up the thread again but I have been having issues with idle lately also. Each time I disengage a gear and return to neutral, ie when stopping my revs seem to jump up a couple of hundred rpm. I have pulled apart and cleaned out the AAC Valve numerous times in the last 12 months so it must be something else, any ideas? Where should the TPS position be when closed? Is there a general rule like TDC or something? Thanks Dale Link to comment https://www.sau.com.au/forums/topic/59049-idle-is-up-to-shit-help/#findComment-1158430 Share on other sites More sharing options...
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