fuel consumption

[fonzo]

my 97 vs s2 v6 berlina is having a few problems atm.....

its using around 200km of fuel in the city and about 300/350 on the highway...changed the coolant temp sensor, plugs, leads, has a new k&n filter 21/2 inch catback redback exaust.. new fuel filter, its always used to that fuel from when it was standard. brought it with 142,000km about a year ago now it has 175,000km on the clock...id really like to get the fuel useage back down. it has a vt auto with that makes any differents....also in the town i dont notice the check engine light coming on but out on the highway with cruise on at a 100kmh it seems to come on for periods of time then goes out......it also at times as u come to a stop will almost stall but it catches itsself and gets out of the stall at times its very hesitant at taking off as well feels like its going to stall... if anyone has anyideas please let me know its starting to drive me stupid

[88GreenVN]

o2 sensor......

[westbad]

check your fault codes but i should almost certainly say your oxygen (o2) sensor has failed, a replacement is around $50-$100 and should only take you 15 mins to fit.

[pillzor]

theres 2 on the v6 i think.

[fonzo]

ok i did the error code check and i got


Code 76 - Air/Fuel ratio variation between left and right banks

[88GreenVN]

ok i did the error code check and i got


Code 76 - Air/Fuel ratio variation between left and right banks

O2 sensor is looking the issue.

[hako]

Or dirty injectors, plugs,leads or inlet/exhaust manifold gasket leak. I'd test the 02 sensors before replacing otherwise you may be throwing your money away. Gregorys has a fairly simple test of the 02 sensors.

[westbad]

Gregorys has a fairly simple test of the 02 sensors.

what does the manual say mate??

[jono1492]

I'm having the exact same problems with my '93 VR station wagon, how do I go about checking the 02 sensors?

cheers

[hako]

Attached is the test. I should add that I've never tested them and simply replaced them. To be honest, on the 3 occasions I've done this (N13 Pulsar, EB Falcon and VS Commodore), no real improvement was noticed. This is why I've suggested you actually test before you replace - this way you get a better understanding of what goes on.