Poor Gas Mileage

[MR240]

My 90 240 is only getting about 300km to a full tank which costs me more than $30...this can't be right...what are the first things i should look at...and cheapest things i can change such as air filter and spark plugs..what else could i do

also could you guys post what kind of mileage you get on a full tank? i'd really appreciate if all you guys could answer..city/highway, driving fast, slow, whatever...just post..thanks

[MR240]

bump

[IveBeenBad]

air filter and plugs most likely... run some seafoam through your tank

[captain nismo]

Yeah check the plugs and filter first. In the summer i was having a similar problem and it turned out the plugs were ****ed. It gets much better mileage now, even with my test pipe.

[MR240]

what kinda mileage should i be getting?

what seafoam stuff?

[Japican]

Im gettin round 220miles on a full tank(cant convert to metric), but that was before it got crazy cold here in chicago i was gettin close to 300 which is still pretty bad.

[Hijacker]

stock for stock with 14PSI, i get 25 to the gallon.

[MR240]

what would be the best kind of sparks plugs to use? NGK G-power?

[captain nismo]

I got bosch platinum 4's? i think. My mileage is ~30mpg or 400 and a bit kilometres per tank.

[v19312]

I usually get almost 500km per tank, But I have recently changed the airfilter for a k&n filter, changed the spark plugs, wires, cap, rotor, fuel filter, and taken off my a/c compressor belt to improve effeciency, and i'm not sure if it makes a difference but I only use premium gas.

Try any or all of those changes and it should help out.

[maik21]

i have this problem too. im getting around of 5km/liter on city . y have change spark plugs, sparks, adjust the timming because i had 8 and now, i have 18. i remove the aiv(exhaust system to air filter) but my problem still . im sorry for my english. i dont write cool.

[leper421]

I used to get 28mpg mixed highway/stop-and-go, now I'm lucky to get 20mpg. Gotta wait untill the weather gets warmer and figure out why. Full tuneup less than 5000 miles ago.

[Touchdown038]

I'm with leper, I get around 28-30 all freeway driving, but in town I get around 20.

You guys who are getting really bad mileage might wanna try cleaning/replacing your air sensors (MAF and O2) to see if that will help. Maybe taking it easier on the pedal might help too.

[leper421]

I'm with leper, I get around 28-30 all freeway driving, but in town I get around 20.

No, I used to get 28 under the same conditions that I now am lucky to get 20. Not 28 highway, 20 city.

[gnmtl90]

check the cap, wires, and rotor, i bought a 1990 5-spd last week and mine were fried, looks like the OE parts, i probably got 20-23 on the highway before it!

[maik21]

i replace de o2 sensor, but its not oem and its not bosh. its a diferente o2 sensor(other make dealer) and the car backfires when i put off gas pedal. should i buy a o2 sensor bosh universal for nissan?

[maik21]

cambié el sensor de o2, pero éste no era de la marca que me recomiendan. era un sensor 02 de diferente marca pero universal. cuando suelto el pedal del acelerador se escuchan unas explosiones. deberé cambiar el sensor de o2 por uno universal marca bosh para mi carro nissan?

[maik21]

my gas milage is 13 mpg on city and 18 on highway

[gnmtl90]

stop, give the car a tune-up; o2 sensor, cap, rotor, wires, plugs, filter; oil change. shouldnt cost more than USD 75. exhale and call me in the morning

[maik21]

recently i do a tune up ... wires, plugs, filter, oil change (quaker state, because on mexico is the only one 15w40). clean injection sistem. ..cap , rotor <---- whats it? how i know that my cap and rotor are fail(damaged) ?my car have new sensors conectors. all the electric sistem is new because the old electric sistem was corroided and damaged and poor conection.

[gnmtl90]

the cap is the thing your plug wires plug into, driver's side of the motor, it has 5 holes and another little doo-dad. the rotor lives inside the cap, it is secured by an 8mm bolt. be sure to tell the parts people which distributor you have (it says on the side so im told).

[maik21]

this is a pic of cap an rotor. its from my car.are cap an rotor fine?

[gnmtl90]

look for pitting on the tip of the rotor, it's the metal "blade", also on the flat side of each of the four posts inside the cap