Tom Whatling 2 Posted August 11, 2022 It seems my 1994 XG Ute seems to be using quite a bit of fuel. I seems to be getting roughly 340kms from a 68l tank this seems a bit high but maybe its just because shes and older bus. Any help would be appreciated. Share this post Link to post Share on other sites
deankxf 20,231 Posted August 11, 2022 25 minutes ago, Tom Whatling said: It seems my 1994 XG Ute seems to be using quite a bit of fuel. I seems to be getting roughly 340kms from a 68l tank this seems a bit high but maybe its just because shes and older bus. Any help would be appreciated. where does the temp gauge sit? thermostat stuck open or removed will mean the engine runs too cold (and the computer adds more fuel like a "choke" .. a LOT more fuel) can also be caused by the clutch fan being locked up, usually notice the engine feels gutless also if so. 1 dex reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted August 11, 2022 Could be a sooted O2 sensor, you can sometimes revive them by removing and dunking the tip in lemon juice overnight.Sent from my CPH2197 using Tapatalk 1 dex reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,828 Posted August 11, 2022 7 hours ago, Tom Whatling said: It seems my 1994 XG Ute seems to be using quite a bit of fuel. I seems to be getting roughly 340kms from a 68l tank 68/3.4 = 20L/100km This screams 'dead o2 sensor' to me. XG original Ford o2 sensors were either Bosch or NTK branded. Around town, an OHC powered Falcon should return about 12-13L/100km Coolant in the exhaust will kill an o2 sensor, new or old. For fuel efficiency, the OHC engine ECU's monitor at o2, MAP sensor, TPS, and coolant temperature Start with a new o2 sensor, (use NTK or Bosch brand only) plus check for the correct coolant temperature (cold will run rich). Factory thermostat is 92degrees. Then if it still needs improvement, get the injectors serviced, and/or fit a new MAP sensor. Aim for around 12-13L/100km around town, and 10-11L/100km freeway driving. Share this post Link to post Share on other sites
Mr Polson 10,214 Posted August 12, 2022 68/3.4 = 20L/100km This screams 'dead o2 sensor' to me. XG original Ford o2 sensors were either Bosch or NTK branded. Around town, an OHC powered Falcon should return about 12-13L/100km Coolant in the exhaust will kill an o2 sensor, new or old. For fuel efficiency, the OHC engine ECU's monitor at o2, MAP sensor, TPS, and coolant temperature Start with a new o2 sensor, (use NTK or Bosch brand only) plus check for the correct coolant temperature (cold will run rich). Factory thermostat is 92degrees. Then if it still needs improvement, get the injectors serviced, and/or fit a new MAP sensor. Aim for around 12-13L/100km around town, and 10-11L/100km freeway driving. Don't use Bosch. Modern Bosch parts are shit quality, made cheap, and have enormous failure rates. They are nowhere near the company they used to be.With thermostat, if not on gas check it's the correct "foot" type one - these block the bypass when the engine gets to temp. I think DT18F is the part number off the top of my head. 2 SPArKy_Dave and gerg reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,828 Posted August 12, 2022 2 hours ago, Mr Polson said: Don't use Bosch. Modern Bosch parts are shit quality, made cheap, and have enormous failure rates. They are nowhere near the company they used to be. With thermostat, if not on gas check it's the correct "foot" type one - these block the bypass when the engine gets to temp. I think DT18F is the part number off the top of my head. I heard that exact sentiment about Bosch from someone else, just the other day. I do agree. It's a real shame as they WERE a quality manufacturer... I guess NTK only now, for the O2's? Awesome tip on the thermostat yes. Without the foot, (and not on gas) the OHC's run a few increments hotter on the gauge, in my experience. I'd also suggest to pre-test any new thermostat, by suspending it in a pot or kettle, slowly bring it to the boil, whilst monitoring the opening temp with a thermometer. Tip - suspend it by a length of thin wire, held by the closed thermostat spring tension. Soon as it begins to open, it will drop off the wire, thus indicating the exact opening temperature. Share this post Link to post Share on other sites