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Volvo 940 230fd and little bit too high fuel consumption 900 1992

posted by  volvomies on  Wed Dec 2 10:48 CST 2020
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Hello


I have 1992 940 230fd + automatic.


Ive owned this car about 6 months now. First months consumption was about 24mpg / 9.5 liters per 100km. That was highway and city 70/30.



After that it has been going to worser. Now its about 19.6 mpg / 12 liters per 100km and same driving style and routes. Even 100% highway mpg was 24. I had 940 with same technic 5 years ago and it took 30mpg highway.




Brakes are ok, allmost all new, plugs, wires, rotor, o2 sensor, air filter etc new. Car has idled, started and drived good all the time it just rises consumption. No header or exhaust pipe leaks also, i cleaned maf which was already clean. Pulsair valves were fault but blocking that no effect. No vacuum leaks and also new intake manifold gasket just for fun


No fault codes, automatic works great and tcc also.


Thermostat is new and works, i have new ecu temp sensor at garage but replaced yet because no symptoms for that either





Im very astonished what is going on????






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