forester using way more fuel that it used to

Andrew · Post by **Andrew** » Tue Dec 27, 2005 10:41 pm

Our my99 foz has decided to increase its fuel consumption slowly over the last 10,000ks

we where getting 8-9L/100 out of town sitting on 100 fully loaded. now its down to about 11-12L. Somethings obviously wrong....

As its around town doing lots of stop/start driving 95% of the time an ecu reset might be in order i think... anyone know how???

failing that what else could it be?
o2 sensor?

tim_81coupe · Post by **tim_81coupe** » Tue Dec 27, 2005 11:36 pm

Replacing the O2 sensor would certainly be the first thing I'd do. I doubt it needs an ECU reset, but the way we normally do them in WA is to leave the battery unhooked overnight, there is a quicker way I think but that's all I've ever done.

Andrew · Post by **Andrew** » Wed Dec 28, 2005 7:30 am

ok i just measured it.
its not cycling betwwen 0-0.9v as it should so im saying its dead.

new one on the way $110

just gotta get the b@stard out then.

tim_81coupe · Post by **tim_81coupe** » Wed Dec 28, 2005 9:25 am

I'll give you a tip with it, douse it in CRC long before you go to undo it, give it about 3 or so coats at intervals of say, an hour.

Definitely use a ring spanner, a shifter won't do any good.

Andrew · Post by **Andrew** » Wed Dec 28, 2005 11:50 am

cheers

will start the rp7 mission this arvo and attempt removal tommorrow

Andrew · Post by **Andrew** » Wed Dec 28, 2005 1:38 pm

um, it actually came out really easy....

ive got 2x black wires which i am assuming are the pre-heaters and also a black wire which would be the o2 sensor output.

Correct?

tim_81coupe · Post by **tim_81coupe** » Wed Dec 28, 2005 2:18 pm

Yup, that's correct. Two for the heater and one for the signal.

Every O2 sensor I've removed has been a pain. Consider yourself lucky

Andrew · Post by **Andrew** » Wed Dec 28, 2005 3:14 pm

its a fairly new car so i would expect it should come out easy

Thanks for help!

Andrew · Post by **Andrew** » Sun Jan 01, 2006 7:59 pm

yay sensor in

back to 8L/100 woohoo thanks!!!!!!

tim_81coupe · Post by **tim_81coupe** » Sun Jan 01, 2006 9:57 pm

Good to hear!