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Weird S3 fuel economy issue

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jade S3, Mar 1, 2011.

  1. Jade S3
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    Jade S3 270bhp 13.6 1/4 mile

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    Hey guys, firstly my car has no fault codes, maf is great, no timing pull, no boost leaks, cts and stat are great too. Now on the highway the car is very light on fuel(2.8-7.5l/100km) but in town(short trips) its disgustingly heavy on fuel(12.5l/100km), it used to be very light in town but now its the opposite. What could be wrong? , please help because its costing me alot of money and i mostly do town driving and i avoid using the aircon, even if i keep the rpm low and barely use the accelerator the least i get is 12.5l yet i used to get 5-8l in town with 3000rpm shifts, 25% throttle and aircon on. Thanks
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  2. S3KO4
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    S3KO4 Member

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    Very good times at 13.6! what turbo is that? Try injector cleaning, clean fuel filter, general servicing, plugs etc, look for leaks & split hoses. and also check previous post here, cloged FPR might have something to do with it, and Lambda logs, something Badger, mentioned in a post by Westle.
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  3. Jade S3
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    Jade S3 270bhp 13.6 1/4 mile

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    Stock turbo thanks, cleaned injectors. New fuel filter, serviced it. No leaks or splits, will look into the fpr but how can it get clogged? . Which meas. block is the lambda log? And what figures should i get?
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  4. S3Steve
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    S3Steve Active Member

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    You say your using 12.5 litres per 100km when doing short trips round town? Thats 22.5mpg which doesnt seem too bad for short trips round town to be honest, maybe a little low but could be explained by the lower temps this time of year mate.
    Last edited: Mar 2, 2011
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  5. Jade S3
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    Jade S3 270bhp 13.6 1/4 mile

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    Yep its 25mpg to be precise, i used to get 40/45mpg in town! . And im not in UK, its hot here(30 deg. C)
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  6. 666markyboy
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    666markyboy Active Member

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    40/45 mpg ????? i doubt that very much i don't get anywhere near that on a motorway run out of a stock 1.8t Quattro in fact i'm lucky to get into 30's and thats driving it carefully
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  7. superkarl
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    superkarl MAN OF STEEL

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    what your saying your getting is normal to me.
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  8. Jade S3
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    Jade S3 270bhp 13.6 1/4 mile

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    40mpg carefully, lambda logs -0.9% add. -2.3% mult.
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  9. JS1500
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    JS1500 Howdy

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    thermostat? What is your temp gauge saying?
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  10. S3Steve
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    S3Steve Active Member

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    Christ 40/45mpg in town, ive never managed to get over 35mpg on a run driving like an old granny!
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  11. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    If your getting that type of mpg round town then you've got a faulty dash, thats impossible, highest ive know anyone get is about 38mpg and thats sat in the slow lane doing 70mph in 6th gear.
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  12. Jade S3
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    Jade S3 270bhp 13.6 1/4 mile

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    Changed the thermostat and gauge is at 90, driving like a granny and getting 23mpg in town is still hectic. Why is it so heavy? , i would be so excited if i could get 35mpg in town
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  13. S3Steve
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    S3Steve Active Member

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    I think the problem is mate, that to everyone on this forum your current mpg seems about right. Are the mpg figures your quoting off the dis or proper calculated ones?
    Last edited: Mar 4, 2011
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