Bad Fuel Economy, '97 Foz

[NachaLuva]

My '97 Foz (EJ20J) has been running rich, using too much fuel (averages about 11L/100kms) & hesitates on acceleration. Also the tailpipe has a layer of soot in it.

A while ago, I put several cans of SUEC through it, plus new Iridium plugs & new leads.


So today I took out the O2 sensor but it doesnt look fouled up.





Can anyone tell me if these look ok?

I also cleaned out the PCV valve & hoses. There was quite a lot of gunk in there but they didnt seem blocked. When I cleaned the PCV valve, it seemed to rattle easily, so I think thats ok. From what I've read, blocked hoses/valve seem to be the cause of problems, but mine werent, just gunked up a bit.

Interesting note, there was some kind of hardened sealant on the valve thread...does this mean its been replaced at some stage?


Is there anything else I should do? 11L/100kms with gentle, economical driving is pretty crap!

[D3V1L]

HA!!! gentle, economical driving returns 20+ litres per 100clicks for me....i wish any of my cars, including my subarus, got 11l/100 k


davo

[NachaLuva]

I've heard of Foresters & Outbacks getting 9L/100kms with mixed city/highway & "spirited" driving.
Taza's economy blew me away, esp with the extra gear he carries & his driving style! lol. Although I have heard he is being much more gentle nowadays...

[Brad_Stacey]

Try changing your fuel filter, it worked for me.

I spent 2 months changing leads, checking coil, doing the ignition relay mod as I was burning 13-14l/100K. Ended fixing with a $25 fuel filter.
If your spark plugs are also clean, then this might help.

Brad

[Gannon]

Oxygen sensors only have a life of about 80,000kms, so if its older than that, its probably buggered

[NachaLuva]

Forgot to mention has a new fuel filter. Also regular injector cleaner.

Engine's done ~170,000kms, not sure if its ever been replaced. How do I know if it needs to be?

[thunder039]

if i drive round town all day i get about 11L per 100km
what sort of economy do you get on long trips? i get around 8 on long trips 11 round town so averages 9.5

[taza]

if i drive round town all day i get about 11L per 100km
what sort of economy do you get on long trips? i get around 8 on long trips 11 round town so averages 9.5

Mines similar but abit less around town and abit more on the highway. More on the highway as almost everyttime im on the highway I have a good lload in and on the car.

Around town driving like a real person I get 10l per 100km or less but my engine is a newer model than yours.

Hammering it around town I never get worse than 12 or 13 at the most.

[NachaLuva]

The best I ever had was driving over to Robe. I took my racks off for less wind resistance & focused on smooth, economical driving. Got bout 9.5L/100km.
Around town its more like 13. Overall I average 11-11.5

[pezimm]

The best I ever had was driving over to Robe. I took my racks off for less wind resistance & focused on smooth, economical driving. Got bout 9.5L/100km.
Around town its more like 13. Overall I average 11-11.5

Geez, that's a bit bad... I get around 10.5L/100km on the highway at 110 and around 11.5L/100km with my daily commute. But as you know, I've got an EJ255 turbo under the bonnet and this pretty much eliminates any chance of gentle driving

Pedro.

[NachaLuva]

Geez, that's a bit bad... I get around 10.5L/100km on the highway at 110 and around 11.5L/100km with my daily commute. But as you know, I've got an EJ255 turbo under the bonnet and this pretty much eliminates any chance of gentle driving

Hahaha :twisted::twisted: