My 1986 Honda Accord fuel consumption is high and the engine is over heating.

Check your timing belt, when I changed mine the pick up increased drastically and the mileage was increased. Remember though that any honda will do better if you do a more gradual increase in acceleration.

The first thing is to check for fuel leaks and for restricted intake or exhaust and ensure the routine maintenance is up to date.

It is important to know what the current fuel consumption is in miles per gallon or km per litre. The modern trend of paying set amounts of money gives a wholly false impression of actual fuel consumption.

When checked accurately over a period and averaged to take account of different types of driving conditions, freezing temperatures and so forth, mostly the result is found to be not as bad as first imagined.

If all checks are found to be ok and the accurately checked consumption is still too high further checks will be needed.

A few possible faults are incorrect fuel pressures, bad injectors, incorrect valve timing, "tired" oxygen sensors, bad thermostat, "tired" temperature sensors...

Wheel alignment, tyre pressures and binding brakes can also be factors...

Is there a smell of gasoline? My 95 accord had two spark plugs that failed or at least not firing correctly. Change plugs back to old plugs and the problem disappeared.

P2240 HONDA - Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 IP Line High Voltage.
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust Possible causes - Air/Fuel Ratio Sensor Bank 2 harness is open or shorted
- Air/Fuel Ratio Sensor Bank 2 circuit poor electrical connection
- Faulty Air/Fuel Ratio Sensor Bank 2
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

This is a very wide encompassing question. It basically revolves around a thorough engine diagnostics and tune up, replacing filters and plugs etc. The quality of all oils will have a small influence on fuel consumption, as will type of tyres and tyre pressures. The most profound influence on fuel consumption is however your driving style and that is a subject too vast to go into here. It boils down to a smooth driving style, judicious use of the transmission (manual or automatic) and driving within the engine torque range whenever possible. Finally high speed requires additional fuel to deliver the power it needs to overcome wind and rolling resistances.

I've come across some with engines that needed a tune up, but in some cases it's the automatic transmission that is not working correctly causing bad fuel economy. What do you think is the problem in yours?

It may be caused by a vacuum leak, make sure to check all your hose for cracks and/or hoses that may have popped off

the common cause of this code is a shorted torque converter lock up clutch.

No .. the SE and SF grades are obsolete .. The use of 5W verses 10W is that the 5W is lighter viscosity oil

Hi,

A Honda Accord is a full size car/heavy and therefore would have high gas consumption, probably around 8~10 Km/L city driving. Highway would roughly be 10~12 depending on your driving habits.

A full tune-up of course would help which may include but not be limited to change of sparkplugs, adding car/injector cleaner to the tank, checking/replacing the air cleaner, double checking/cleaning/replacing the MAF (if it has got one).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.