Car Ripping Through Petrol. HELP!!

[devilsadvocate]

I drive 375 miles a week in my car which costs about £30 assuming i poodle along at 65 on the motorway. This week however it has cost me £45!!. I could literally see my petrol gauge going down every mile i did. I have checked the tank and cannot find a leak anywhere.

Recently i have changed the idle control valve for a second hand one and also put on a brand new Cat/ the cat was bout a month ago and the valve bout two weeks ago. The cat was brand new from unipart/partco.

Any help would be much appreciated.

[Toad]

Wow, that's good mileage!

It's possible a lamda sensor is sending incorrect signals to the ECU, making the car run rich, or the MAP sensor can do this commonly too.

I doubt those changes you mention could effect the MPG...

[devilsadvocate]

I prob should have mentioned that the engine management light is ON. Have done a diagnotsic and it came up with two errors, Idle control valve (which i then replced) and the second was 'Cat below efficiency, Bank 1'. This was AFTER i had replaced the cat so i dont see how its below efficency when its brand new. The blokw in the garage said bank 1 referrs to the lambda sensor on the downpipe, but im not sure i believe him. Seemed like a bit of a cowboy.

[gozzy-vtr]

i do 40 quid a week and do about 200 miles? i think u have been doing well at 30quid n e way mate. not sure what to suggest. new exhast system will change it? or inductuon kit. duno

[Barry123]

The blokw in the garage said bank 1 referrs to the lambda sensor on the downpipe, but im not sure i believe him. Seemed like a bit of a cowboy.

I'd believe it to be honest...

if the lambda is shagged then you're going be experiencing issues bruv.

[gregory87]

i do 40 quid a week and do about 200 miles? i think u have been doing well at 30quid n e way mate. not sure what to suggest. new exhast system will change it? or inductuon kit. duno

40 quid gets you 200miles?! have you got hummer or something? you do realise that in a saxo that equates to about 20 mpg?! even if it was a vts that would be shocking mpg.....do you drive everywhere in 1st or what?

[andyvts98]

i get 100 mile to £10 in a vts not being shy. sounds like the cat if the engine management light is on. that only usually comes on if the cat is f'd or theres no cat in. more lights on the dash the better lol

[lavo-vts]

if i plod around on motorway i get bout 400 miles to 40quid so id say you have got an issue there mate.
my vts should be way more thirsty than your 1.4

[Yates]

vtr 350 miles til light came on
vts about the same

[Crunkers]

I spend about £15 a week if I'm lucky! Sometimes I may not fill up for 2 weeks sometimes. I do about 250 miles a week.

[devilsadvocate]

Cheers for the advice.

Think im gonna replace the lambda sensor on the downpipe. You would think that the diagnostic would be inelligent enough to flash up 'Lambda sensor shagged' as opposed to 'Cat below efficency' and make you guess whether its the cat or the sensor?.

F*****G French

[puzzledzippy]

you should try running my mr2 i just about get 200 miles to a tank

[CloVis]

Just thought id pop in with my useless info, mine ate loads when my oxygen sensor broke.
ALSO the eml came on!!

Prob that other sensor though.:p

[devilsadvocate]

Thanks. Will check the oxygen sensor as well. Didnt even think of that!

[forbessid]

I put £30 in a week and only get 220 miles, pretty shit really but just thought being a vts this is why??