buzzhd

o2 sensor, air filter, gas filter etc?

thanks!

cneary812

yes

buzzhd

yes means I have to change all of them? I don't think I ever replaced o2 sensor...

cneary812

Well, the way you stated your question you answered it, so if you want a clearer answer next time ask a clearer question.
But to answer your question changing a bad O2 sensor will improve mileage and performance. You may also want to check your flex pipe to see if you have any holes because if you have any holes there then it could give your O2 sensor false readings causing it to malfunction.

buzzhd

sorry for my ignorance, what is the flex pipe?

cneary812

it is part of yor y-pipe (look under your car and the pipe that hooks to your exhaust manifolds [y-pipe] has a section that has a metal mesh covering on it that flexes with your engine ie flex pipe) and connects to the cat. O2 sensor is next to it in the y-pipe. (well at least on the VE)

buzzhd

thanks, Now I remember I had it replaced by the mechanic. What they did was cut the flex pipe and then put a new one by melting...

cneary812

if you ever plan on modding this car at all you may want to get an aftermarket y-pipe.

mikekantor

iTrader: (5)

I recently discovered a fuel leak near the gas tank on my 93 SE, that decreases fuel efficiency!

Thankfully a hose replacement took care of that.

cneary812

yes that can do it as well as the fuel filler pipe. There was a recall on it.

crazy4maxima

iTrader: (5)

the obvious issues are alignment, tire pressure, driving style, accessories, traffic , weather, tune up, tire size, weight,wind resistance, gravity, altitude, old parts that lose their specs..
gas octane
there are alot of reasons

mikekantor

iTrader: (5)

When I got my Max back in August, changing the charcoal-black air filter gave me an extra 100 miles on the tank!

So the lesson is, don't forget the obvious stuff.

buzzhd

so how often do I have to change air filter?

AscendantMax

iTrader: (7)

every 30,000 miles.

me, i just take it out and clean and re-oil everytime enough crap builds up on it. good 'ol K&N

chris92

Fosgate Fan, When you installed the K&N filter, did you notice a difference in economy/performance. Is it worth the money?

cneary812

If you love your car and plan on keeping it for a while get one. Remember, you can always reuse it on another car or sell it later if you want. You will definately notice a performance increase (POP or CAI) once you remove that restrictive air box. Economy is about the same. You don't need to spend 200 bucks to get it though.

MightyMax13

Also, and I know that this was mentioned briefly, but I want to emphasize that driving style dramatically changes your mileage. I drove aggressively on my Max until just recently. I now get 100 more miles per tank! Just don't accelerate so fast and drive the limit (thats a hard one I know!). These are two easy things to help improve your mileage.

ThumpinMaxima

i find braking hard kills my gas milage...i try now to not use my brakes, when I kno my turns comin i just slow my car down by laying off the accelator--and i can still speed (Thank you V-1)

cneary812

You brake around corners????

Maxima NutBag

a cracked gas return line can do it too! happened to me.

crazy4maxima

iTrader: (5)

speeding up and stopping then speeding up etc..


yes i had a breather that runs from my gas tank under the rear left wheel and it had worn out , so everytime i filled up with gas i would lose most of it b.c when i turned off the max, the pressure
in the tank was released and then the tube would expand and the gas would leak from the crack.,. very dangerous, i dint notice til i kept smelling gas and my nose lead me to the rear where i litteraly saw dribbles of gas coming down.. quick fix..

Maxima NutBag

yeah, I kept smelling it in the area near the VIN number under the hood on mine.

DanNY

iTrader: (14)

fuel lines?
fuel filter?

buzzhd

any idea how to check the fuel lines if there are leaking?

DanNY

iTrader: (14)

replace what you can see...all of them. the lines are old so they tend to "seep" gas out..hence the smell.

aw89maxSE

iTrader: (3)

Please don't flame me but how do you change the fuel filter??

DanNY

iTrader: (14)

small can mounted on the firewall vertically. hose from the bottom...hose coming from the top.

depressureize the gas line 1st...(pulling fuel pump fuse)

loosen 2 clamps (top and bottom)
pull hoses off..
spray yourself w/ gas.
knock over screwdriver while reaching for new filter.
install new filter while paying attention to flow direction (should be an arrow --> flow)
slide hoses back to new filter
tighten clamps
wipe spilled gas from fender
turn the car to "on" position to check for leaks..hear the pump prime the fuel/engine.
go back in your house smelling like gas

DaBoxSE

iTrader: (5)

Oh man, I have that problem now! no wonder why mileage is so ishty...I just thought it was a VE thang. How did you fix this??

AscendantMax

iTrader: (7)

quick question, are there different flow rates in the fuel filter based on different filter brands?

Maxima NutBag

wasn't the fuel lines, this work was done by the dealership and they inspected the engine and its lines when i took it in.