my 240 uses fuel like V8

[thekawaii]

i have 1989 ka24e 240sxi did change my engine one time (engine with 100000miles on it)it has pretty good compretion, 5-speed transmission ok, i see no problembut the car uses fuel like V8. It wasn't my driving habit. is there any 240sx fuel system problem happen commonly?freeway: 3gallons->56 miles with 70mph.

[DAEDALUS]

Probably a leaking injector seal. Is the exhaust really sooty, and does it smell rich, like gasoline? Pull all 4 plugs and look at them. If one is real black and fouled up, you'll need to replace the seals on that cylinder's injector.

[Touchdown038]

Yeah check injectors, also check your O2 sensor for proper operation.

[180fan]

While you're changing the o2 sensor, it wouldn't be a bad idea to do a full tune up (plugs, ignition wires, dist cap and rotor, fuel filter, air filter, check your timing, adjust your idle, etc).

[thekawaii]

thanks for repliesi'll check it right away~!thanks