Help!! Very poor mpg - Nissan Xterra Forum
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#1 Old 02-13-2013, 09:26 AM
Alex Montayre
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Help!! Very poor mpg

I recently did a tune up on my 2000 xterra that had 135k on it. When i bought it i pretty much could tell it never had one so i bought ngk everything and got it down I also got the fuel injectors flushed. Bad news is im only averaging 11mpg, when im supposed to be getting 15-17 city and 18-19 hwy. I have no idea what else could be effecting my mpg this badly. The Check engine light is on, but i was told by advance auto its a common sensor that gets tripped with the 3.3v6 motor nissan puts in the xterra and frontier. If anyone has suggestions or anything it wud help alot. thanks.

-Alex
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#2 Old 02-13-2013, 09:30 AM
Gsimpson2G
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Knock sensor maybe what they are talking about. Is the truck running fine, maybe a little down on power, but not much?
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#3 Old 02-13-2013, 09:36 AM
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Yes he did mention something about the knock sensor. Ive only had the truck for a month, so i cant really tell if its low on power or not. He gave me the codes i gotta find them. Is that an easy sensor to replace? But, yes the car runs fine if the sensor wasnt on i wouldnt even notice anything was wrong lol.
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#4 Old 02-13-2013, 10:12 AM
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I'm getting about 11 mpg in my 2000 with 140k. I'm chalking it up to "winter grade gas", but I wouldn't expect to get 19 mpgs out of of a tank ever. My BEST tank ever was 15.7 and that was only highway driving
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#5 Old 02-13-2013, 10:17 AM
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try disconnecting the battery for a little bit to clear that code out. Drive around for awhile, and see what your MPG are then, and check after a bit of driving and see if the code is back,
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#6 Old 02-13-2013, 11:11 AM
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I get 11-13 from the SC around town. Have been able to push 18 out on the highway running Nevada fuel but with the bad gas we have in California, it's not surprising.

When Hell Freezes Over, I'll Ski There Too!!
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#7 Old 02-13-2013, 12:44 PM
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alright ill have to try that soon and let u guys know if anything changes. Thanks for the advice!!
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#8 Old 02-13-2013, 05:08 PM
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Yes chalk it up to winter grade gas
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#9 Old 02-13-2013, 05:54 PM
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To the dude with poor MPG. With 135k make sure to get that Timing belt ASAP!
Then make sure you got the right plugs for your X. NGK Platinum tipped! Second might as well get new Plug wires then go ahead and check the distributor inside.
Change all your fluids, the tranny needs to be flushed with a special machine and add some royal purple, just a tad. Motor oil to Royal Purple. Air Filter (not that K&N crap, it opens up the air but also takes in more dirt)
Next pull out your Wheel Bearings and clean them out and the housing and repack them in FRESH GREASE (BOY What a difference it makes!) Get an allignment BUT with 135k your bushings could be worn enough to screw up your allignment right away. Get new bushings. You have to press out the old and press in the new (Get at least Polyurethane)
Shocks and tires. Bilstein or Rancho's and Michellins. This all should get her up to spec.
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#10 Old 02-13-2013, 06:12 PM
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OH>.. Check to see if your fronts brakes are dragging. You might not feel it so much but put the car up and spin the front wheels, they should move freely, if not then you need to get new brake calipers or try to at least clean the old ones, grease up the sliders, free up the pistons if they stuck. If you need to know how ask me.
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