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HELP, gas milage probs....

phat97yukon

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phat97yukon Enthusiast

phat97yukon

Posted
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hey guys, just wondering what kinda KM's you get to a gas of tank in your OBS yukons/ hoe's, i was just talkin to my buddy, his dad has a 99 Hoe, gets bout 600 to 700 KM to a tank in town and 800 on highway, on 110/120 liter tank.. mine i swear i got 650 Km to a tank intown and not much more on highway...I also took a trip 3 months ago, 300 Km cost me 38 bucks in gas at $1.20 a liter..

But in the last little while my milage has gone to crap, ive replaced my fuel pump and sending unit cuz my old gauge was wonkey, than that didnt fix it, changed the gauge cluster out, seemed to work fine for the time being, but my last 3 to 4 tanks of gas ive been lucky to get 350KM to a tank before its in the red zone , before i would get about 175 to 200 KM even before the gauge would move, now bout 90 KM the gauge drops...

Im just wondering if maybe the odds are my gauge is screwed again cuz ive done nothin to effect my gas milage latly, my truck is a well tuned machine, front and rear diff fluid has been changed, oil, tranny drained new filter and fluid, new fuel filter and Sea foam threw the tank, upper end cleanin also with sea foam, new NGK iradium plugs, new msd wires, new cap and rotor, new tires that im runnin a little harder to gain the lil bit of gas milage outta em, always clean K&N , throttle body and MAF always spotless...

 

If anyone can help me out here with any idea's this would be great, and is there a surefire fix for the d**n gas gauge problems ???

tarantula Enthusiast

tarantula

Posted
Posted

don't want to seem like i'm speaking outta turn here, but try converting the metric to American and you might get more replies. it's too much work for many of us to do the conversions!

 

anyway, i know what you mean. i have a 97 yukon too, and my mileage has gone to crap too. i used to get around 400 miles (643.74 km) or so on a 31 gal (117.35 liters) tank, and now i'm lucky to see 300 miles (482.8 km). one of the codes in the trucks computer is showing a problem with an o2 sensor, which would affect mileage. i'm going to test and probably replace it and see if that helps.

phat97yukon Enthusiast

phat97yukon

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Posted

Thanks for the reply tarantula, if i knew how to convert this shiz tho i would but im from canada so im a lil slow.. lol jk man..

 

So it looks like pretty much we were reasonably close to the same tho for milage before, thats my big worry is O2's at $120 each than havin to crawl around in the snow, but i havnt had any codes yet, do you know of anyway to test em your self ?.

Do you have any mods on your truck ? Even after i added my k&n and my flowmaster catback i gained a lil gas milage last year, but i dont think what i have done would kill the milage in the long run.. so hopefuly your right with the O2's , keep me up to date on if you get them changed soon and if it helped the milage

johnmcn New Member

johnmcn

Posted
Posted

I have an 05 Yukon that'll get 400 miles per tank on the road, 5.3 engine/2wd and an 01 Sierra X-cab with 143000 miles on it and i got 431 miles (22.3 mpg) on a tank last night driving around North Texas all day and then to Fort Hood and back last night!

I don't drive the Yukon much, except on a trip... (wifes car) but I drive the Sierra all day, every day. around 16 to 17 around town but well over 19 on any trip with cruise set to 75. If I drive 80, I get around 16.5 mpg...

tarantula Enthusiast

tarantula

Posted
Posted
Thanks for the reply tarantula, if i knew how to convert this shiz tho i would but im from canada so im a lil slow.. lol jk man..

 

So it looks like pretty much we were reasonably close to the same tho for milage before, thats my big worry is O2's at  $120 each than havin to crawl around in the snow, but i havnt had any codes yet, do you know of anyway to test em your self ?.

Do you have any mods on your truck ? Even after i added my k&n and my flowmaster catback i gained a lil gas milage last year, but i dont think what i have done would kill the milage in the long run.. so hopefuly your right with the O2's , keep me up to date on if you get them changed soon and if it helped the milage

 

 

 

 

No problem. Here's a handy site for just about any conversion you'd need. http://www.easysurf.cc/cnver6.htm#cig4 ;)

 

I have the K&N kit and Flowmaster catback exhaust too. That's pretty much it for performance mods though. The rest is just looks. There is a way to test them, I think you measure the resistance. I'm not sure if I'm remembering that right though. I came across this page on Autozone's site. http://www.autozone.com/servlet/UiBroker?F...e71.jsp#hd1-1-2

 

Good luck. I guess I'll see if changing the sensor helps soon.

phat97yukon Enthusiast

phat97yukon

Posted
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Posted

Well i think im going to be tryin the O2's tommorrow.. i have a buddy that works at napa, and he can get me mine for 36 bucks each, beats normal price of 130... talk bout mark up.. than sunday i will be doin a highway run, so i will put up what kinda diffrence i get outta the new O2's as soon as i get this crap figured out..

lonerogue New Member

lonerogue

Posted
Posted
Well i think im going to be tryin the O2's tommorrow.. i have a buddy that works at napa, and he can get me mine for 36 bucks each, beats normal price of 130... talk bout mark up..  than sunday i will be doin a highway run, so i will put up what kinda diffrence i get outta the new O2's as soon as i get this crap figured out..

 

 

 

 

 

I'm curious about this as well, I used to get at least 13 out of my truck. Its gone down to 9 ever since I started driving it full time again(I got a motorcycle this summer). It seems to run as good as ever. The tires are where they are supposed to be. I actually put new plugs in it less than a year ago. It just doesn't add up. I was thinking it might be the 02 myself and came on here to see if anyone ever had this problem.

phat97yukon Enthusiast

phat97yukon

Posted
  • Author
Posted

Got the 02's in lastnight, stompin on the gas feels alot nicer, squawkin tires into 2nd gear... as for gas milage dont know yet, but i gotta 300 + km road trip tommorrow so i will let ya know bout the gas diffrence once this tank is done...

citydriver Enthusiast

citydriver

Posted
Posted

You also have to consider that we are burning "Winter Blended Fuel" up here in the north, your milage will also suffer a little due to that. I know for a fact mine does. Not to mention the extended period of time you spend in traffic due to weather conditions this time of year......just a thought

 

But worn or slow reacting O2's are also a deffinate cause of declining milage.

I only have 1 on my '95, so it's easier for me to swallow the expense. I changed it almost 2 years ago and saw a deffinate improvement, as a matter of fact it's been over 50k miles, I may have to do it again. :D

phat97yukon Enthusiast

phat97yukon

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Well since ive changed the O2's, ive filled the tank, as of right now im 550KM and change, and its in the red now this is after a bunch of city driving and the better part of a 300KM highway run yesterday driving between 120Kph and 150Kph in a head wind , but when i get on the gas, the gas needle goes up to just over a 8th of a tank, so im thinkin i am havin minor gauge probs also because even when its not moving anymore and i fill it , its only takin bout 90 liters and thats squezzing it full when it should be 120ish fill... SO im still debating on runnin this tank till it runs out dry to see what my over all KM is..

But it beats the 350/380 Km to a tank before doin the 02's last week... :D

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