25mpg on a run for a 16v

[mysticman aka polypathetic]

i get on the motorway every morning and travel from stevenage to london colney and then on to hemel hempstead
every day i get an average of 34mpg
mine is an 8v 2.0
half of the time i'm crawling the rest i'm doing the speed limit
the distance is 22 mile one way and i cane i tank of super unleaded in just about a week
petrol prices funking stink in this thingyry
jay

[Overseer]

l'm going to block the isv off and see what that does just in case it is leaking.if you take your the throttle some times it holds back and some times it don't.

the ISV doesnt 'leak' the problem is it doent close due to gunk... just remove the connector on it...

my problem is.. i replaced the ISV, and the split pipe from the block at almost the same time..

the ISV appeared to help.. but the one from the block really sorted it.. so now i'm convinced it was more a vacuum thing than the ISV

[Rich16v]

l'm starting to think it might be the lSV, l'm 99% sure l've checked every pipe and hose on the car now, l even found that all but one or the manifold bolts were half undone or finger tight(where the two manifold half bolt together) and fitted new gasket but still the same.

lts funny l was thinking last night an old girlfriend of mine about 11 years ago had a mk1 gti which was playing up, l spent ages messing with it, l bet l could fix it now with what l've learned from this site.

Rich

[Rich16v]

the ISV doesnt 'leak' the problem is it doent close due to gunk... just remove the connector on it...

Well l unpluged the lSV today and it idles lovely, still only getting 26mpg though 

[mrwotto]

i was getting 37-38 on my trip to newark at the weekend.

Was sticking mostly to the speed limits tho!

Had to most of the way as i was following a mk2 1.6 driver lol

[free]

yeh you was from a distance

[mrwotto]

In your dreams mk3 boy

[davero]

i just replaced all breather hoses i my 16v, the big one you guys mentioned had split, so had the inlet manifold pressure sensor hose(little hose at back of throttle body to ecu, this was causing lumpy running, poor mpg ect), i decided then to change all those small diameter hoses as a large length only cost me £1 at the local motor factors. the result is astounding, my car feels unbeleivable, better then it ever has and i have owned it for three years. by the way there are 4 such hoses
1) throttle body to ecu
2)throttle body to airbox
3)top of rocker cover
4)crank case breather box
Cannot recommened doing this enough

[Overseer]

excellent!

i also have a length of the small hose to replace the ones i dont like the look of at some point

[Rich16v]

i just replaced all breather hoses i my 16v, the big one you guys mentioned had split, so had the inlet manifold pressure sensor hose(little hose at back of throttle body to ecu, this was causing lumpy running, poor mpg ect), i decided then to change all those small diameter hoses as a large length only cost me £1 at the local motor factors. the result is astounding, my car feels unbeleivable, better then it ever has and i have owned it for three years. by the way there are 4 such hoses
1) throttle body to ecu
2)throttle body to airbox
3)top of rocker cover
4)crank case breather box
Cannot recommened doing this enough

The one from the throttle body to the airbox, does it go to the top or bottom fitting

Cheers
Rich