broomie Posted January 30, 2021 Share Posted January 30, 2021 My 2001 NA auto supra is only getting around 10mpg since i done an oil and oil filter change on tuesday, The engine is running fine, and no signs or smell of a fuel leak, Anyone have any idea what could be the cause? Thanks in advance Broomie Quote Link to comment Share on other sites More sharing options...
rider Posted January 30, 2021 Share Posted January 30, 2021 (edited) I'd venture it has absolutely nothing to do with an oil and filter change. So many question, lets start with how do you know its only doing 10mpg? Did you run 100 miles and fill up with 10 gallons or did you go off the fuel gauge? Is there a smell of fuel around the car or unburnt fuel exiting the exhaust? I cannot imagine anyone would be able to offer any meaningful input to your question without a lot more background and information. Edited January 30, 2021 by rider (see edit history) Quote Link to comment Share on other sites More sharing options...
mc92 Posted January 30, 2021 Share Posted January 30, 2021 Any fault codes? There are loads of things which could affect the MPG, oil is not one of them. Quote Link to comment Share on other sites More sharing options...
The Raven Posted January 30, 2021 Share Posted January 30, 2021 O2 working? Other than that unless you nicked a fuel line during that change then it shouldnt have anything to do with the MPG Quote Link to comment Share on other sites More sharing options...
broomie Posted January 30, 2021 Author Share Posted January 30, 2021 17 minutes ago, mc92 said: Any fault codes? There are loads of things which could affect the MPG, oil is not one of them. how do i check fault codes? Quote Link to comment Share on other sites More sharing options...
mc92 Posted January 30, 2021 Share Posted January 30, 2021 1 minute ago, broomie said: how do i check fault codes? Quote Link to comment Share on other sites More sharing options...
broomie Posted January 30, 2021 Author Share Posted January 30, 2021 34 minutes ago, mc92 said: done that, no codes stored Quote Link to comment Share on other sites More sharing options...
mc92 Posted January 30, 2021 Share Posted January 30, 2021 Worth checking the O2 sensors then as mentioned above. There's a way to test them in the TSRM, page EG–247. http://shoarmateam.nl/upload/MKIVSupra/Supra-MKIV-Repair-Manual/Engines/SFI System - 2JZ-GE.pdf Quote Link to comment Share on other sites More sharing options...
evinX Posted January 30, 2021 Share Posted January 30, 2021 Good old nas. A few things can throw it off Throttle position sensor. When set properly the car will burn the correct fuel to air ratio O2 sensors, Distributor cap/ arm, the MAP sensor plugged in? Whats the air filter like? Quote Link to comment Share on other sites More sharing options...
Bender Posted January 30, 2021 Share Posted January 30, 2021 6 hours ago, mc92 said: Its 2001 so it should have obd2 Port? Quote Link to comment Share on other sites More sharing options...
broomie Posted January 30, 2021 Author Share Posted January 30, 2021 2 hours ago, Bender said: Its 2001 so it should have obd2 Port? what is that? and where would it be? Quote Link to comment Share on other sites More sharing options...
Bender Posted January 31, 2021 Share Posted January 31, 2021 13 hours ago, broomie said: what is that? and where would it be? Tbf never seen one before in Supra but im quite sure they made it mandatory every petrol car from 2001 onward and diesel car 2004 onward should have one. Most of the time they under steering wheel or nerbay. You can buy cheap code Reader on ebay and read the fault codes Quote Link to comment Share on other sites More sharing options...
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