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terrible gas milage

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terrible gas milage - 8/28/2005 8:33:47 AM   
freak15

 

Posts: 2
Joined: 8/28/2005
From: United States
Status: offline 		need some help with this one.  97 3.5 v6 138,000 i've had this vehicle for two years and love it. Was surfing the other day and found this sight as well as some factory specs that state 17/19.  This made me think that maybe my getting 8-10 in town is a little off. Am woring on cleaning fuel injectors. plugs are in good shape, thinking maybe o2 sensor? Other than the milage the car seems to run fine, doesn't miss at idle or during acceleration. any ideas?
Post #: 1
terrible gas milage - 8/29/2005 11:39:21 AM   
Patrick

 

Posts: 250
Joined: 3/17/2005
From: United States
Status: offline

With a 1997 model, if there was an O2 sensor issue, since that is an emissions related item, your check engine light would come on.  you have to understand that those specs of 17/19 are on a brand new vehicle, in a fairly controller environment.  There are a few consumer right companies that are trying to push for companies to post real-world mileage stats, but nothing has come thus far.  I would run some fuel system cleaner through it, like something from Outlaw or Lucas.  Do you have any modifications, including different tire size?


(in reply to freak15)
Post #: 2
terrible gas milage - 8/29/2005 4:14:30 PM   
kayvee33

 

Posts: 2
Joined: 8/29/2005
From: United States
Status: offline 		Is a 2W or 4W drive.  I too have a 97 Limited Edition 2W 4Runner and in fact I am getting fantastic mileage from it - approx 20 - 22 MPG.  There is gotto be something wrong if you are getting such a low mileage (even if you have a 4W drive). 

(in reply to freak15)
Post #: 3
terrible gas milage - 8/29/2005 5:27:34 PM   
freak15

 

Posts: 2
Joined: 8/28/2005
From: United States
Status: offline

The check engine light did come on two weeks ago but the milage has been bad for alot longer than that. No other mods that I am aware of. Am running 265's for tires. it is a 4 x 4 but like you say that should't have this much effect I wouldn't think.


(in reply to freak15)
Post #: 4
terrible gas milage - 9/3/2005 2:48:48 PM   
Phat4Runner

 

Posts: 2
Joined: 9/3/2005
From: United States
Status: offline 		Fuel filter?  That little bugger has made a lot of people's lives pretty miserable, an often overlooked little gadget.

(in reply to freak15)
Post #: 5
terrible gas milage - 9/6/2005 1:05:37 PM   
Patrick

 

Posts: 250
Joined: 3/17/2005
From: United States
Status: offline 		i would worry about getting it a good tune up, and possibly a good air filter, like a K&N drop in, or even an aftermarket intake system if available.  my car went from 22 to 24 with my K&N CAI

(in reply to freak15)
Post #: 6
RE: terrible gas milage - 3/2/2007 1:52:18 PM   
scoolro

 

Posts: 1
Joined: 9/5/2006
Status: offline 		I had an 88 4runner 5speed v6 and when I changed the fuel filter my Kilometers dropped. I now have a 91 4runner 5speed v6 same engine type and changed fuel filter and again noticed big drop in kilometers. So few months later I bought another Fuel filter, this time spent the money to buy stock toyota fuel filter and still no change in Kilometers. When I had the truck I had about 335 KM now I get about 270km. what could it be? Anyone please have an idea why this happened and what I can do to improve fuel consumption. I haven't changed my oxygen sensor yet because engine light hasn't lit up. So i beleive the O2 sensor is okay. I have tried many times to figure out what is going on but with out any luck.

So if anyone has anyideas PLEASE! PLEASE! PLEASE! help.

Many thanks in advance for any help,
Scoolro

(in reply to Patrick)
Post #: 7
RE: terrible gas milage - 3/15/2007 11:01:26 PM   
palladin8

 

Posts: 20
Joined: 2/4/2007
Status: offline 		catayletic converter possibly?  I know when they start getting plugged you lose power and mileage.

(in reply to scoolro)
Post #: 8
RE: terrible gas milage - 3/20/2007 9:52:10 AM   
icerunner

 

Posts: 12
Joined: 1/30/2007
Status: offline 		Hey sorry to hear about the gas miliage. I have heard some rumblings on the internet about a BAD O2 Sensor severly impacting your runner miliage with our model engine.

I too have a 99' 3.4 Litre V6 (same model and engine as you) AND Get this.... I heard that the O2 sensor can go bad for a long time WITHOUT registering a "check engine" light on your dash.

You say that your gas miliage was bad WITH OUT and NOW WITH a check engine light? With 135K, 
I'm willing to bet that its 1 of your 2 -- "O2" sensors or both.

THE GOOD NEWS: there easy to locate under your car (1 right before and 1 right after) your catalictic converter on your tail pipe about midlength under your car.
THE BAD NEWS: the o2 sensors are expensive at your local "Stealer" and sometimes they are well rusted to the tail pipe.  FYI Upon removel, Seriously watch your hands as I swear that I have almost lost a whole fricken knuckle before *ucking around trying to remove a stupid o2 sensor that was rusted to the tail pipe.

you can find this OEM part for just over $100.00 each  online from a real toyota dealer who (online) sells the same part for much cheaper than your local toyota dealer. I believe "Mossy" toyota out of California is a online OEM toyota discounter.   

Fyi you may wish to take your car in to have the trouble check engine light diagnosed at a trusted shop who can scan your cars ECM ($30 to $100.00) and find out what the real issue is..... and then fix the issue your self.

especially if it is an o2 sensor, as they are pretty easy to change out (if there not rusted to your tail pipe)

good luck and let please let us know what you find out.

(in reply to freak15)
Post #: 9
RE: terrible gas milage - 3/20/2007 9:51:53 PM   
BCPlatnumBomb

 

Posts: 33
Joined: 1/3/2007
Status: offline 		Very interesting read.  How easy is it to replace the fuel filter by yourself?

_____________________________

Black '00 SR5
Stock...for now

(in reply to icerunner)
Post #: 10
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