nevins Posted March 25, 2011 Share Posted March 25, 2011 tps might be faulty. Quote Link to comment Share on other sites More sharing options...
nevins Posted March 25, 2011 Share Posted March 25, 2011 come to think of it iirc 51 is linked to the tps, has anyone adjusted this at all to try and mask a fault previously. Check to see if where its retaining bolts are there are older marks which will show it has been moved, there is no reason to move it really unless someone has played with it. With it in the wrong position the ecu will hold the revs up. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 I dont think it has been adjusted as the idle used to be fine... where is the tps located? isnt there two of them? im thinking I should change that or the coolant temp sensor not sure what one its most likely to be, also does anyone know where this breather valve is? if i pull the hose off that and the revs dont rise I guess that could be the fault.. Quote Link to comment Share on other sites More sharing options...
nevins Posted March 25, 2011 Share Posted March 25, 2011 You have no need to start randomly searching mate, you have a fault code which leads to the tps, icv. You say you have checked the icv so got to the tps. Its attached to the throttle body it will be on the end of the shaft for the butterfly. You will need a multi meter and check that its working within its correct range. Rather than jumping at each thing work through them one by one, and rule them out. This is the easiest and most practical thing to do. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 25, 2011 Author Share Posted March 25, 2011 I think I know the one your on about I thought there was two tps for some reason Quote Link to comment Share on other sites More sharing options...
nevins Posted March 25, 2011 Share Posted March 25, 2011 No only one, in simple terms, it sits on the shaft, when the shaft rotates the sensor turns also and gives a reading to the ecu Quote Link to comment Share on other sites More sharing options...
Nic Posted March 25, 2011 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 OEM Toyota oxygen sensor? Quote Link to comment Share on other sites More sharing options...
Supra Gaz Posted March 25, 2011 Share Posted March 25, 2011 Car sounds buggered mate, buy mine! Seriously though, dont loose the love, good luck Quote Link to comment Share on other sites More sharing options...
dude Posted March 26, 2011 Share Posted March 26, 2011 Are Skylines ITBs? So if it's the shaft that leaks on them they'd be suffering boost leaks too? Feckin Taxis The leak is caused by the butterflies wearing the bore they seal in over the years that stays the correct size due to a build up of dirt/crud/carbonized oil etc, any TB thats used will wear out eventually. Quote Link to comment Share on other sites More sharing options...
jagman Posted March 26, 2011 Share Posted March 26, 2011 I think the engine has an idle up from the power steering and also the aircon , check the hose / switch , then put your thumb over all hoses from intake manifold and see if the idle changes Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 26, 2011 Share Posted March 26, 2011 Could be the ecu receives an A/C "ON" signal once warm and it raises the idle speed. There really are so many things it could be, but if you have cleaned the throttle body, fitted a new ICV and set up the TPS sensor properly it could get complex. Be glad it's not a Cadillac, just imagine trying to trace this absolute gem of a fault Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 The icv isnt new i stripped and cleaned it and when i took it back off the day after its position had changed so im guessing its working, im going to get the engine upto temp today and remove the tps sensor plug and if nothing happens i guess the tps sensor is the fault or if the revs rise then the tps sensor is fine so ive been told also going to try and measure the ohms of the temp sensor Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 One thing i did notice when i took the main pipe off the icv and blocked off the icv with my finger the revs dropped down to normal... Quote Link to comment Share on other sites More sharing options...
nevins Posted March 26, 2011 Share Posted March 26, 2011 You did refit the gasket for it? Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 Yeh i did but when i block it off with my finger and revs drop back to normal that makes me think its the icv hmm Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 26, 2011 Share Posted March 26, 2011 What I would do, bearing in mind I am electronically illiterate, is to try turning the A/C on when it's idling fast, and see if idles faster still. If it doesn't it may suggest that for some reason the ecu thinks the A/C is coming on when it warms up. If the gas pressure in the system is marginal it may expand enough with engine rad fan heat to trigger the A/C clutch, assuming there's not enough gas charge to work from cold. Does the A/C work properly? Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 I will be back from work in few hours so will try that aswel chris, although i would have though on an engine with a normal idle of 7-800rpm turning the air con on it wouldnt make it idle at 1400rpm thats way to high but will try this anyway Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 26, 2011 Share Posted March 26, 2011 Depends if it still sends an idle up signal if there's no or little gas in the system and compressor clutch doesn't engage. Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 just got the engine upto temp took it out for 15 minute drive came back idling at 1600rpm so whilst it was still running i disconnected the tps sensor plug and the idle bounces between 1400-1600 rpm so i guess that mean the tps sensor is working? also I took a reading from the ox1 port and it was 1v so the car is majorly overfueling im thinking coolant temp sensor now.... Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted March 26, 2011 Author Share Posted March 26, 2011 bump Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted April 5, 2011 Author Share Posted April 5, 2011 turned out to be the tps sensor! Quote Link to comment Share on other sites More sharing options...
nevins Posted April 5, 2011 Share Posted April 5, 2011 Glad you found it mate. Quote Link to comment Share on other sites More sharing options...
Jimmy James Posted April 5, 2011 Share Posted April 5, 2011 Haha just read this and was gonna suggest the tps, always screwed up on my 5.0L mustangs in the past causing same problems :o) Quote Link to comment Share on other sites More sharing options...
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