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Author bad fuel economy (update)
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
13th Oct 03 at 22:22   View User's Profile U2U Member Reply With Quote

i have a 1.6 16v sport with a pipercross induction kit and a custom cat back 2" piping and 4x4" tailpipe. on £10 it gives me 63 miles that's mainly local mixed with a bit or thrashing. before the exhaust it use to give me 80miles per £10 surely it can't make that much of a difference can it?

help! poor student here!

[Edited on 21-10-2003 by Mo]
MikeH
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Registered: 3rd Apr 03
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13th Oct 03 at 22:23   View User's Profile U2U Member Reply With Quote

its probably the way you are driving it.
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
13th Oct 03 at 22:50   View User's Profile U2U Member Reply With Quote

doubt it. i can't be driving it badly all the time.
Kerry
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Registered: 5th Oct 01
Location: Norwich
User status: Offline
13th Oct 03 at 22:55   View User's Profile U2U Member Reply With Quote

i have a 2.5 v6 mate and i have a pipercross viper and a custom cat back too, my fuel consumption has not altered since havin them fitted if anything its better. wot sort of driving are u gettin 63 miles to a tenner though i get more than that when its all town driving

perhaps it needs a good service/tune or maybe try resettin the ecu
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
14th Oct 03 at 00:21   View User's Profile U2U Member Reply With Quote

Kerry - my car's been serviced 2 - 3 months back plus i've hardly driven it so i don't think its that. not tried resetting the ecu yet, but will try it tomoz. my main driving is local (town) driving and i know 63 miles is poor for a 1.6
miles
Member

Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
14th Oct 03 at 07:42   View User's Profile U2U Member Reply With Quote

80 miles is poor!

I do about 90miles to £10 in a 164bhp tb'd 1.6 16v....with a mix of driving......

Is it running ok?

It could be a few things:
Dodgy plugs/leads
Coolent temp sensor
Dirty air filter

A host of other things as well no doubt!
mad_mike
Member

Registered: 2nd Dec 02
Location: uk, Mansfield
User status: Offline
15th Oct 03 at 11:56   View User's Profile U2U Member Reply With Quote

poor my 1.2 8v does 70 mile to a tenner when u cane it, thats w*nk
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
15th Oct 03 at 11:58   View User's Profile U2U Member Reply With Quote

miles it's had a good service not so long ago. i thought 80miles to a £10 was ok. Take it u had better when your 1.6 was standard?

Anyway i took Kerrys advice and re-setted the ecu and the car run alot better. it feels more reponsive than before and the fuel needle has risen higher than it was before??

i don't know if anyone else gets this problem but my fuel needle drops dramatically when putting my foot down, then it'll rise again slowly when i've stopped.
DangerousDave16v
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Registered: 20th Feb 03
User status: Offline
15th Oct 03 at 19:48   View User's Profile U2U Member Reply With Quote

I find that you tend to drive your motor in the power band more ,when its got wee mods like filter and exhaust ,without realizing,cos it sounds better.
Since i drilled my airbox its been hard not to let it sing.
i can squeeze 120 miles out of my sport 1.4 16v for a tenner , but thats being very conservative. I've had as low as 40-50 miles on a tenner if im fcukin about.
brezzecorsa
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Registered: 31st Aug 03
Location: north wales, chester
User status: Offline
   15th Oct 03 at 20:59   View User's Profile U2U Member Reply With Quote

yeah i used 2 drive a diesel corsa it hurts a bit wen u get a petrol:s i get 100mile from a 1.2 8v which i thrash the nuts out of almost constantly!lol
kerzo
Member

Registered: 10th Nov 02
Location: Norn Iron
User status: Offline
15th Oct 03 at 21:48   View User's Profile U2U Member Reply With Quote

i get about 350 miles to a full tank on mine which is a lot of motorway miles over 4k revs and a lot of urban miles in congested areas
MoNkEy MaGiC
Member

Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
15th Oct 03 at 21:58   View User's Profile U2U Member Reply With Quote

hi,
ive got a corsa Gsi with viper and full exaust.....

i rinced my tank to almost empty the last Two times i filled up and drove with mixed type of driving somtimes jus slow crusing, long motorway journeys and Hard Redlining driving...basically a mix of everything and this is wat i found.....

the best petrol i reckon is SHELL unleaded! i got about 200miles from 20quid, and its a good quality petrol

im now using SHELL OPTIMAX unleaded, i got about 100miles so far from 20quid and reckon the tank will hit redline in about 20 or so miles!!!! i thought this wud be better? but maybe performance wise it is coz it burns quicker?

but thats a difference of about 80miles
IntaCepta
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Registered: 25th Mar 02
Location: Mill Hill East, Greater London
User status: Offline
16th Oct 03 at 00:15   View User's Profile U2U Member Reply With Quote

this is depressing
i only get 70 on a tenner,
and 220 on a full tank (£34)..
i don't even rag it that much.
MoNkEy MaGiC
Member

Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
16th Oct 03 at 00:19   View User's Profile U2U Member Reply With Quote

woah! wat u got under the bonnet??? a 3.0litre
Cybermonkey
Member

Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
16th Oct 03 at 00:23   View User's Profile U2U Member Reply With Quote

i easily get 100miles on a tenner, sometimes more if im easy on me right foot
miles
Member

Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
16th Oct 03 at 07:44   View User's Profile U2U Member Reply With Quote

I could do about 220miles to £20 on my 121bhp 1.4 16v, I only ran the 1.6 as standard for 1000 miles whilst I was running the engine in (well, still had mantzel power box, 4 branch, cams etc) and it did about 250 miles to £20 I think, but obviously that was taking it easy.

Throttle bodied cars can be just as economical at part throttle as standard engines.
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
16th Oct 03 at 10:24   View User's Profile U2U Member Reply With Quote

miles u said earlier i could check a few other things (apart from the ones u have already listed). what are these? i just wanna check it over

by the way those of u who think i ragg my car to bits are wrong. i change gears under 3 revvs until i get to 5th where the needle sits at at around 2 revvs. when i do put my foot down, that when my petrol needle drops dramatically and u can see the difference!

[Edited on 16-10-2003 by Mo]
Kerry
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Registered: 5th Oct 01
Location: Norwich
User status: Offline
16th Oct 03 at 11:46   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Mo
Anyway i took Kerrys advice and re-setted the ecu and the car run alot better. it feels more reponsive than before and the fuel needle has risen higher than it was before??

i




mine did that too but i guessed it was due to perhaps over a period of time the gauge becoming a little out and the resetting cured it

anyway fingers crossed its better now
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
16th Oct 03 at 11:48   View User's Profile U2U Member Reply With Quote

thanks kerry
Kerry
Member

Registered: 5th Oct 01
Location: Norwich
User status: Offline
16th Oct 03 at 11:50   View User's Profile U2U Member Reply With Quote

no probs
miles
Member

Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
16th Oct 03 at 12:45   View User's Profile U2U Member Reply With Quote

Is the fuel gauge set off the ECU then? I think not.......

Blocked exhaust
binding brakes
physical leak
Inaccurate speedo/mileometer
lambda sensor
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
16th Oct 03 at 12:51   View User's Profile U2U Member Reply With Quote

i don't know if the fuel gauge is set off the ECU. i'm just letting u know what happened.

- can't be the exhaust cause i just got a new one (full system)

- don't think it's the brakes can't hear and friction noises and car does seem to drag.

-don't think there's a physical leak cause there's no wet patches when i revv the car and i can't see anything wet in the ngine bay

- speed will be out by a bit cause i'm running on 17's

- don't know what a lambda sensor is? maybe i'll check that if u tell me what it is
Kerry
Member

Registered: 5th Oct 01
Location: Norwich
User status: Offline
16th Oct 03 at 13:04   View User's Profile U2U Member Reply With Quote

fuel gauge maybe not but my mid which gives me mpg and range ect is
miles
Member

Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
16th Oct 03 at 13:26   View User's Profile U2U Member Reply With Quote

Lambda sensor (Oxygen sensor) is in the exhaust manifold, its measures the amount of oxygen in the exhaust gases on part throttle and adjusts the fueling accordingly.

Only way to check it is to replace tbh.
Mo
Member

Registered: 29th Jan 03
Location: Bolton, Drives Q3 S-line +
User status: Offline
16th Oct 03 at 14:13   View User's Profile U2U Member Reply With Quote

so this means i have to take the manifold out replace the sensor and put it back together. or do i have to replace the whole manifold?

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