MY 240sx is eating soo much gas!!

[Enomshekiaah2]

sry i posed this in the tech talk forum more appropriate im sry but keep on posting need alot of advice and willing to learn from wise 240sx peoples :hsdance:

[bo2o]

did you check ur spark plugs?

was your maf even bad in the first place?
did you replace your air filter, sounds like you have a miss

[Enomshekiaah2]

umm i bought spark plugs but i didnt need to change it..i have a injen intake and when i bought the car which was 3-4 weeks ago it was just like this rev limit and mis fire when idling *like a popping sound* but i should get a tune up as well tho

[projekt_s13]

my S13 eats gas too, but yea look into getting a tune up, plugs,wires,distributor cap,rotor also get your timing checked.

[breakindrifts]

Your timing is probably retarded.
And your 02 sensor is most likely bad.

Those 2 things will help a lot.

Then do a general tune-up.

[Enomshekiaah2]

Thanks guys im on it. Ill check the timing and the o2 sensor then the tune up. Thanks alot for the help

[bo2o]

fuel pump also

2nd on that timing

[Ragnarok043]

how about the MAF, wouldnt a faulty MAF cause it to run on close loop running rich.

[projekt_s13]

^^^^^^^^^^^^ he replaced it already.

[kleenS14]

+1 on O2 sensor. they will ruin your mpg. The back-up tables are really rich from what I know.

[240trainee]

Yea they are.

I haven't had a funcional o2/ no exhaust leaks in a long time, lol.

car runs rich as shit.

check your o2.

[Enomshekiaah2]

Ok thank you everybody ill look on all of the things that you told me

[HalveBlue]

Did you try checking your ECU for codes yet?

That'd be my first step in problem diagnosis.

There are a lot of things that can cause your car to run rich and/or get bad gas mileage.

Check your codes first and then go from there.

[Enomshekiaah2]

hmm ecu codes i juss bought the 240 so im kinda new where is the ecu and the right coding how do i know?

[pbcstylez]

ECU is located at the foot of your passenger interior, kick panel, held in via 3 screws iirc. for codes and descriptions search.

[916S14]

might wanna check the evap system. i'm getting pretty bad gas milege and my check engine light is on.....=(

[Buffalo Daughter]

Ha you might wanna do a major tune-up. If you kept your car in shape it wouldn't have such a bad diet on gas. Prolly all choked up on carbon and dirt.

[azndoc]

http://img403.imageshack.us/img403/6233/jennycraigstoryax5.jpg

[Bizzytony]

like they said do the small stuff, plugs, oil, fuel filter. But what works best for me is use a Lucas Oil Brand injector cleaner, it works wonders. I know some people say it dont do shit but i use it every 1500miles i get 27.7 mpg, and my bro used it in his v8 lexus ls400 he went from 200 miles per tank to 300, no shit, for 3 bucks cant go wrong
http://www.lucasoil.com/products/display_products.sd?iid=26&catid=2&loc=show

[Jsellers]

Do a full tune up and also try doing about 70mph on the highway. I had a MK3 Supra before my 240 and i was complaining about bad gas mileage. I started driving slower and I immediately saw a difference.

Good Luck!!!! =D

[longdy]

lol i think everyone here is having some kind of issue with fuel! lol

[Enomshekiaah2]

thx so what i knwo is chek timing o2 and tune up oil been changed before bought it so i dont think its that but i will prob do everything of the following thx guys n e other this is shud do juss tell me thanks peoples much appreciated

[s13pignose]

If you gotta clean your maf check with an auto parts store such as advance uato parts for this stuff called crm mass air flow sensor cleaner. Comes in an aerosol can, suppose to not damage anything

[kriptix]

Do a tune-up.

Check your timing.
Replace your O2 sensor.
Check for exhaust leaks.
Check your coolant temp sensor, warm up your car and wiggle the connector see if it makes your idle change. If it does get a new sensor and get a new connector.