fuel mileage sucks..need ideas.

93-mx-3 · Post by **93-mx-3** » February 4th, 2007, 12:10 am

i have the 1.6 sohc n im getting horrible gas mileage with it. i can burn through about a 1/4 tank in bout 3 or 4 days n i dont drive it that much or that hard at all... does nebody have ne ideas wat could be going on...i've swapped the injectors, maf, n the regulator out for the protege ones but i wouldnt think itd decrease mileage that much..wats your opinions??????

Yoda · Post by **Yoda** » February 4th, 2007, 1:59 am

Have you changes that O2 sensor? On the SOHC the should be changes about every 60000-90000km. Even then they are pretty dead. The stupid thing about them is that they can be totally dead and not throw a code. I converted my old car to a 4 wire O2 because they have a little more bandwidth that a OE single wire and isn't dependant on EGT to get the sensor up to temp and the other reason is I was a bunch of them I stripped of scrap engine at a JDM shop. As I remember my mileage jump from about 10L/100km up to 8L/100km.

Pin hole leaks in your exhaust especially before the Cat can equal a small fuel economy loss. The flex join is the usual place to find this leaks at the best of times. On the other end pinhole leaks in the gas filler neck and gas tank will affect not only fuel economy but power as well. An oversized aftermarket exhaust and muffler can have a negative effect by killing off the bottom/ mid power.

A bad chassis and engine ground will also affect fuel economy.

These three things should made a night and day difference not only in fuel comsumption but power you didn't know you lost as well as long as the compression is still good.

In the end before scrapping my car I was averaging 7.3L/100km or about 32mpg in mixed city/high traffic.

93-mx-3 · Post by **93-mx-3** » February 4th, 2007, 12:52 pm

ok...i gotcha...so get the o2 sensor..cus i have 172,500 miles on my engine and im pretty sure its never been changed...n also check the ground..im almost positive me exhaust is good...but ill check that too...

93-mx-3 · Post by **93-mx-3** » February 9th, 2007, 12:06 pm

i need to get an o2 sensor...i got a quote at car quest for it they said $85....

Limegreen mx-3 · Post by **Limegreen mx-3** » February 9th, 2007, 2:57 pm

there like $20 at autozone single wire O2

93-mx-3 · Post by **93-mx-3** » February 11th, 2007, 11:35 pm

ya i went to adavanced auto yesterday n got a bosch one for like 25...i put it on today n it runs perfect...

Tropical Emerald 1993 · February 13th, 2007, 1:50 pm

I've replaced O2 sensor and flex pipe but still get around 11L/100km.

I'll pour in that injector/valve cleaner and see what happens. Any other suggestions?

93-mx-3 · Post by **93-mx-3** » February 14th, 2007, 6:12 pm

idk..i changed my o2 sensor n it helped a lot.......check all ur basic maintenence stuff...like filters n plugs n wat not...i mean it can never hurt..

facko · Post by **facko** » February 14th, 2007, 9:08 pm

i used to run that injector cleaner in my car every other tank, makes a difference after few times thru..good preventive maintnence

94blaze1.6 · Post by **94blaze1.6** » February 15th, 2007, 1:12 am

Check your tire pressure also

93-mx-3 · Post by **93-mx-3** » February 15th, 2007, 12:09 pm

basically do basic maintenance.....if that doesnt wrk let us no

Typhoonk · Post by **Typhoonk** » February 15th, 2007, 12:42 pm

another easy check is your oil pan drain bolt. Had my oil done at a place and they didn't not tighten the bolt properly and my oil pressure went done (didn't lose a lot of oil so no crazy damage). Cut my mileage in half

just something to check