Poor fuel mpg...not the best with the price atm!

Hey all,

my mk2 1990 1.8 8v is drinking petrol,

I know with prices recently my range on £15 would drop, but its gone right through the floor and looks to be over fueling massively to the point where I actully have a carbon stain on my bumber above the exhausts lol.

Any pointers would be welcome, I've tried changing the blue temp sensor with no notable effect and checked for air leaks...even cleaned out the idol control...now I'm stumped

thanks

clean throttle body, clean your air filter. check all the connections to the sensors just incase there loose, check all fuses to do with fueling in the fuse box. thats all i can think of to be honest mate, and i learnt this at gifhe. about the only thing i have learned from there. lol


remember tom diagnose the problem.

How do you drive it? I guess yours is a digifant? I get on average 28-31mpg around town and around 45mpg on a good run, are you just going by the MFA reading or can you actually see the fuel guage going down?

lemski wrote:clean throttle body, clean your air filter. check all the connections to the sensors just incase there loose, check all fuses to do with fueling in the fuse box. thats all i can think of to be honest mate, and i learnt this at gifhe. about the only thing i have learned from there. lol


remember tom diagnose the problem.

Thubs up for this one, start with the easy simple stuff first, i did this on mine and it has made a good difference in my fuel.

yeh my fuellings better not av turned the air down, so it ticks over at 950, it is abit lumpy though

My idle sometimes raises itself to about 1100rpm on its own, and it'l stay there for a while. This doesn't happen all the time though. Is the idle control thingy magig in front of the inlet plenum to blame?

sounds like a faulty isv there mate, i know that my cold start valve doesnt work, or does sometimes work, but doesnt really bother me.

I've heard you can clean them? How dya do that?

petrol or carb cleaner mate, theres like a vaccum pipe goes into the back of them i think, am not sure as i havnt really looked at my isv, but ide say (and dont hold me to this) your poor some carb cleaner in that hole and wash out. i think there will somats on the tinterweb or golfgti. but then post it up in haynes so we all know.

Just found some good info on digifants, just posted it up in the haynes section. Tom shoudl read this too, might help him out.

av seen it mate, and you 8v lot are sorted with ya digis, us k-jet will have to soldier on still. (doesnt bother me as am off to bike carbs)