[Mk2] [Turbo] MR2 KM2 Rev 1 Turbo: 19 mpg standard?

[doctor_tom]

HI,

I have a MR2 MK2 Rev 1 Turbo with uprated inter-cooler, intake, 3" decat and huge exhaust, 1 bar boost.

The car is sound, no fault codes, runs like a dream... but I only get around 18-20 mpg no matter how I drive it, it is usually driven off boost as if I gun it I can visibly see the fuel gauge go down.

Is this normal?

Anything I can check?

[Pauln]

Sounds a bit low if you're being gentle with the right boot. I certainly average a bit better than that with my rev2. Have you checked he colour of the plugs for any signs of over fueling?

Paul

[androo007]

I hit 29-30mpg usually when my Rev 3 was the same spec.

[doctor_tom]

Hi,

I'll check the plugs, might get a AFR meter but I know it is over fueling just trying to work out why.

Maybe the lambda sensor is shot. I did redo the wire to the lambda sensor as it had melted which may not be sensible but I think it just gives a voltage but this may have changed the resistance in the wire.

No ECU faults as I said... AFM working fine... Water temp sensor rewired.

[SonicSW20]

Have you tested the ECU water temp sensor and the o2 sensor?

[doctor_tom]

I have not. I just redid the wiring the connectors.

Is there a method?

[SonicSW20]

Yes, check the BGB - https://drive.google.com/open?id=0B-dpU ... jJTcE1BNTQ

there's a reference chart of resistance vs temperature for the ECU temp sensor - it's just a thermistor.

There's also a troubleshooting section that lists the common causes of poor fuel consumption.

[doctor_tom]

Yes, check the BGB - https://drive.google.com/open?id=0B-dpU ... jJTcE1BNTQ

there's a reference chart of resistance vs temperature for the ECU temp sensor - it's just a thermistor.

There's also a troubleshooting section that lists the common causes of poor fuel consumption.

HI mate,

thanks for that link, very useful!

I'll check the water temp and O2 sensor and clean the air filter.