markyboy2505 Posted March 29, 2011 Share Posted March 29, 2011 hi people, i have jus had my car mot'd and every since i have had it back the car has been eating fuel like never b4. does any1 have any advice why this could be. understand fuel prices are going through the roof but it seems really extreme. i put £20 of petrol in and it barely come's out of the empty logo on the computer. any ideas please give me a shout. markyboy Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted March 29, 2011 Share Posted March 29, 2011 hi people, i have jus had my car mot'd and every since i have had it back the car has been eating fuel like never b4. does any1 have any advice why this could be. understand fuel prices are going through the roof but it seems really extreme. i put £20 of petrol in and it barely come's out of the empty logo on the computer. any ideas please give me a shout. markyboy Maybe because the price of petrol has gone up recently, £20 of fuel is not as much as it used to be I reckon £20 will get you about 60 miles so seems about right to me... Quote Link to comment Share on other sites More sharing options...
rabbitstew Posted March 29, 2011 Share Posted March 29, 2011 What MPG is it showing on the computer and how does that compare to before the MOT. An MOT should not change anything to do with the fueling. In the oldern days with carbs, some places used to adjust the fuel mixture if the car was failing on the emissions test. But these days that doesnt happen because of ECU`s etc... As a guide, my 313 is currently doing about 25mpg on average over a tank full which is mainly cruising to work and back with the odd spirited bit of acceleration. Quote Link to comment Share on other sites More sharing options...
markyboy2505 Posted March 29, 2011 Author Share Posted March 29, 2011 yea totaly understand that, i've had the car for arround 2 and a half year and it almost seems like in the last 3 weeks my economy has almost halved. Quote Link to comment Share on other sites More sharing options...
markyboy2505 Posted March 29, 2011 Author Share Posted March 29, 2011 the car actually failed an ommission test when i got it mot'd as there was a tiny hole in the exhaust and the guy said he tried to do it 3 times. could they have changed the mixture? Quote Link to comment Share on other sites More sharing options...
markyboy2505 Posted March 29, 2011 Author Share Posted March 29, 2011 also when i got the car back it was saying on the comp that the mpg was down at arround 5 mpg and it took arround a week to get it up to arround 22mpg Quote Link to comment Share on other sites More sharing options...
rabbitstew Posted March 29, 2011 Share Posted March 29, 2011 the car actually failed an ommission test when i got it mot'd as there was a tiny hole in the exhaust and the guy said he tried to do it 3 times. could they have changed the mixture? I think your best bet is to go back and have a word with them and find out if they actually did anything. The 5mpg would be because they had it sitting there idling, then revving it to do the emissions. If you reset the computer, then have a drive about you`ll see what normal mpg your getting. Quote Link to comment Share on other sites More sharing options...
markyboy2505 Posted March 29, 2011 Author Share Posted March 29, 2011 the guy that mot'd my car has moved abroad so i'm basicly on my own on that 1. can u actually get it set up 2 use less fuel? Quote Link to comment Share on other sites More sharing options...
Dblock Posted March 29, 2011 Share Posted March 29, 2011 the guy that mot'd my car has moved abroad so i'm basicly on my own on that 1. can u actually get it set up 2 use less fuel? Yes, get it uprev'ed. Makes if more effiecient and is the only remap solution going. Tell the RST, A/M or Jez to map it for economy rather than performance. Quote Link to comment Share on other sites More sharing options...
Chris`I Posted March 29, 2011 Share Posted March 29, 2011 Sounds to me like the mech that MOT'd it went and ragged it for a bit! I've only ever got mine down to 5MPG by taking it on track! And thats going some! If the tester ragged it around, then the fuel trim would have adjusted to use more fuel to get more power, however that should return to normal very quickly. They couldnt have changed the fuelling of the car unless its been UpRev'd or has an aftermarket ECU, so that wont be it. My guess is fuel trim which will adjust itself. Try resetting the ECU, that will reset the fuel trims. Also get the exhaust fitted and it will make more power and be more economical Quote Link to comment Share on other sites More sharing options...
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