Iky Posted March 22, 2012 Share Posted March 22, 2012 Hello, Ive noticed a slight oil dribble from the larger pipes that go into the stock bov. Are these pipes under boost when driving? Would this be a leak thats pushing oil vapour out? I don't have a boost guage and i havn't noticed a difference in performance. I do however have a problem with it using twice as much fuel than normal. Could these two be linked? I have already fitted a new o2 sensor about 6 months ago but it didn't make much difference to fuel economy. At current prices i get about 40-50 miles out of £20 with 'normal' driving ie. not booting it. I also have left the battery disconnected for a day or two and no fault codes before or after. As always, any advice is much appreciated. Quote Link to comment Share on other sites More sharing options...
Nic Posted March 22, 2012 Share Posted March 22, 2012 Some oil mist from the BOV is normal. Was the O2 sensor you fitted a genuine Toyota one? Quote Link to comment Share on other sites More sharing options...
dude Posted March 22, 2012 Share Posted March 22, 2012 Your getting about 10 mpg, I get 25 on a single with 600 hp !!!! something wrong there. Quote Link to comment Share on other sites More sharing options...
Iky Posted March 22, 2012 Author Share Posted March 22, 2012 Some oil mist from the BOV is normal. Was the O2 sensor you fitted a genuine Toyota one? Cheers Nic, but it does seem to be coming from where the pipe joins. I will have to change it but just needed to know if this could be related to the crap mpg? The sensor was not a from Toyota but a Denso dox-028 from sparkplugs.co.uk It was identical to the old one. Ive just done a search and am going to check the voltage at the diag port tomorrow and will report back. Maybe the sensor's duff. Your getting about 10 mpg, I get 25 on a single with 600 hp !!!! something wrong there. Tell me about it Dude Quote Link to comment Share on other sites More sharing options...
Iky Posted March 25, 2012 Author Share Posted March 25, 2012 O.k, With regards to this thread by ian c- http://mkivsupra.net/vbb/showthread.php?35940-Narrowband-O2-Sensor i've checked the voltage at the diag. port and i'm getting a cycling between 0.06 and 0.82 yes, thats correct 0.06 not 0.6 So does this mean the sensor is goosed? Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 28, 2012 Share Posted March 28, 2012 How did you check the diag ports, did you bridge any? I am also getting bad mpg about the same! Any news on the source of the problem? Al Quote Link to comment Share on other sites More sharing options...
Iky Posted March 29, 2012 Author Share Posted March 29, 2012 (edited) How did you check the diag ports, did you bridge any? I am also getting bad mpg about the same! Any news on the source of the problem? Al /QUOTE] Yes I checked the diag. No errors stored and I checked the voltage via the ox1 and ground. Sorry no new developments, I've put up a wanted thread for a 02 sensor to rule that out but nobody yet. Could also be th ecu temp sensor from what ive searched. it's very strange as the car seems to drive absolutely fine- no missfires/stuttering. Edited March 29, 2012 by Iky (see edit history) Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 29, 2012 Share Posted March 29, 2012 Yes I checked the diag. No errors stored and I checked the voltage via the ox1 and ground. Sorry no new developments, I've put up a wanted thread for a 02 sensor to rule that out but nobody yet. Could also be th ecu temp sensor from what ive searched. it's very strange as the car seems to drive absolutely fine- no missfires/stuttering. Yes i also read up on the ecu temp sensor, dose that mean the water temp or engine temp sensor? I purchased an 02 sensor for my jdm supra from amazon http://www.amazon.com/gp/product/B0018JSCK2/ref=oh_o00_s00_i00_details.. the part number is matched for a toyota supra TT from denso website! Still getting bad mph..i will find out more on the temp sensor and change it poss Quote Link to comment Share on other sites More sharing options...
Nic Posted March 29, 2012 Share Posted March 29, 2012 I purchased an 02 sensor for my jdm supra from amazon http://www.amazon.com/gp/product/B0018JSCK2/ref=oh_o00_s00_i00_details.. the part number is matched for a toyota supra TT from denso website! I'd check the new oxygen sensor to make sure it is working properly, see HERE Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 29, 2012 Share Posted March 29, 2012 Ahh read that post before..Once I find my multimeter I will check if its working correctly, thanks for the link Quote Link to comment Share on other sites More sharing options...
Iky Posted March 29, 2012 Author Share Posted March 29, 2012 Ahh read that post before..Once I find my multimeter I will check if its working correctly, thanks for the link /QUOTE] Post up your results Fordy when you get a chance. Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 29, 2012 Share Posted March 29, 2012 Yes I will by tomorrow eve I found my multimeter.. My 02 sensor is only 2000miles old max (aprox) Quote Link to comment Share on other sites More sharing options...
Iky Posted March 30, 2012 Author Share Posted March 30, 2012 Yes I will by tomorrow eve I found my multimeter.. My 02 sensor is only 2000miles old max (aprox) /QUOTE] Mine has done pretty much exactly the same mileage as well! May be we got a shit batch ? lol Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 30, 2012 Share Posted March 30, 2012 Following the guide given by nic and supra manual, Fluctuates from 0.04v to 0.90v every 2sec, bringing the revs up to 1500rpm and holding the reading just fluctuates at a faster rate. I guess the 02 is the problem but is it tho could be another cause?? Quote Link to comment Share on other sites More sharing options...
Nic Posted March 30, 2012 Share Posted March 30, 2012 (edited) When I was trading I had a number of members buy genuine Toyota O2 sensors from me after originally buying cheaper O2 sensors and them not working. Yes the OEM O2 sensors are not cheap but they quickly pay for themselves in fuel saving. Never had a problem with an OEM O2 sensor and must have sold hundreds. Edited March 30, 2012 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 30, 2012 Share Posted March 30, 2012 100% agree OEM sensors are most likely made to compensate the richness of the engine! I will be poping down my local dealer this weekend also to buy a iacv vsv, ttc auto is doin my head in! Cheers Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 30, 2012 Share Posted March 30, 2012 When I was trading I had a number of members buy genuine Toyota O2 sensors from me after originally buying cheaper O2 sensors and them not working. Yes the OEM O2 sensors are not cheap but they quickly pay for themselves in fuel saving. Never had a problem with an OEM O2 sensor and must have sold hundreds. Have you stopped trading for good? Quote Link to comment Share on other sites More sharing options...
Iky Posted March 30, 2012 Author Share Posted March 30, 2012 The one i got is a proper Denso from sparkplugs.co.uk. The stock one is also a Denso from what i've read on here. Quote Link to comment Share on other sites More sharing options...
Thomas.B Posted March 30, 2012 Share Posted March 30, 2012 Having the same issue! On full tank of gas I get approx. 120miles!!! So far I've changed: All oils and filter, sparkplugs, o2sensor and thermostat without any better mpg. Also bought the 02 sensor from sparkplugs that many on here have gotten and theirs worked fine. I have not checked the settings on mine but it didnt work before changing it so I have ruled the 02 sensor out. This winter I changed the ECU sensor but havent had time to drive the car yet. Please keep the thread updated, I'll update any progress I get. Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 31, 2012 Share Posted March 31, 2012 Having the same issue! On full tank of gas I get approx. 120miles!!! So far I've changed: All oils and filter, sparkplugs, o2sensor and thermostat without any better mpg. Also bought the 02 sensor from sparkplugs that many on here have gotten and theirs worked fine. I have not checked the settings on mine but it didnt work before changing it so I have ruled the 02 sensor out. This winter I changed the ECU sensor but havent had time to drive the car yet. Please keep the thread updated, I'll update any progress I get. check your voltage with a voltmeter please.. let us know i had ordered a oem 02 from toyota parts dealer i will keep this up too date al Quote Link to comment Share on other sites More sharing options...
Iky Posted March 31, 2012 Author Share Posted March 31, 2012 check your voltage with a voltmeter please.. let us know i had ordered a oem 02 from toyota parts dealer i will keep this up too date al How much did it cost bud? Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 31, 2012 Share Posted March 31, 2012 How much did it cost bud? £130 lighter Quote Link to comment Share on other sites More sharing options...
fordy_alexsupra Posted March 31, 2012 Share Posted March 31, 2012 I do believe it could be also poor injection fuelling, worn out OEM fuel pressure regulator and possibly bad MAP or MAF (no sure if MAF is what it is called for UK cars) Quote Link to comment Share on other sites More sharing options...
Thomas.B Posted March 31, 2012 Share Posted March 31, 2012 check your voltage with a voltmeter please.. let us know i had ordered a oem 02 from toyota parts dealer i will keep this up too date al Sure thing! First off I'll just fill her up with gas and drive around, hopefully the ECU temp-sensor was the faulty part. I have been asking before about the FPR but everybody on here says they never brake. Quote Link to comment Share on other sites More sharing options...
Konrad Posted April 1, 2012 Share Posted April 1, 2012 I would suggest to check temperature sensor, even if gauge showing fine, one between engine and ecu might be gone and ecu thinks engine is cold thus adding more fuel... Quote Link to comment Share on other sites More sharing options...
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