1991 Olds '98, 3800 Vin L engine, 249,000km, rebuilt transmission
Car consistently gets abyssmal fuel economy (last fillup was 50 litres for
341 km of city and highway driving)
I know this vehicle should be doing better as we have a '94 '88 with the
exact same engine and transmission, and I have wrung 11km per litre of fuel
out of it on a good day on the highway.
Parts I have changed in an attempt to improve this (with minimal effect)
plugs, wires, o2 sensor, air filter, fuel filter, PCV valve, thermostat,
ignition coil packs (to remedy an unrelated intermittent poor starting
problem), catalytic converter has also recently been changed
Can anyone suggest where on earth my fuel is going? I cant smell any fuel
leaks or see any wet spots under the car. The engine still runs quite well
considering the amount of mileage on it and still accelerates briskly when
the pedal is mashed.