PINION Posted November 3, 2014 Share Posted November 3, 2014 so, I am 3/4 through my trip from ny to nv to the point Truck preforming wonderfly, not even burning oil today cruise on, 73 mph, 2700 rpm, throttle drops out like the cable snapped (wtf), if any one here has a manual you know how it feels when you just pull out of throttle. anywho, so I turn off cruise, and start loosing speed up hill, then up incline, ( in wy at this point, lots of incline) 1/4 tank of gas. no power when in throttle, no bucking or anything other then truck just slowing. on the flat god as long as I don't put full throttle. wnet and gassed up. went nice for 29 miles then same issue continues. againg no other symptoms other then all of a sudden fab fuel mileage. truck has power, just not under load. Im thinking fuel filter clogged. Did 80 for another 200+ miles. just no power under load. Link to comment Share on other sites More sharing options...
ferrariowner123 Posted November 3, 2014 Share Posted November 3, 2014 (edited) i'm thinking exactly the same, fuel filter, or fuel pump is dying, for your sake i hope its the filter, but its not hard to change, just a 10mm! (i think its a ten) -Kyle EDIT: Your profile pic is scary... Edited November 3, 2014 by ferrariowner123 1 Link to comment Share on other sites More sharing options...
sgtplatt2011 Posted November 3, 2014 Share Posted November 3, 2014 Check your power valve? Link to comment Share on other sites More sharing options...
PINION Posted November 4, 2014 Author Share Posted November 4, 2014 replaced the fuel filter roadside in Salt Lake, weehaa. much better. Although tires 3 ' bigger and loaded down with several hundred pounds of my sh#t doesn't help im sure, lol 1 Link to comment Share on other sites More sharing options...
ferrariowner123 Posted November 4, 2014 Share Posted November 4, 2014 (edited) is much better fixed? I'd recommend running some sort of injector cleaner, one that doesn't mess up your injectors. i think chevron has one that does great for that. gimme a second. -Kyle EDIT: This stuff, the fuel system cleaner, NOT THE INJECTOR CLEANER!! http://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E Edited November 4, 2014 by ferrariowner123 Link to comment Share on other sites More sharing options...
PINION Posted November 4, 2014 Author Share Posted November 4, 2014 Techron is chevrons, I ran save the pieces (STP) , couldn't find techron on the road. and yes the filter change did the job. after that down shifting helped too 1 Link to comment Share on other sites More sharing options...
PINION Posted December 3, 2014 Author Share Posted December 3, 2014 Turns out, once I dropped to lower elevation it went back to beast mode. So, I will be returning to the west and to higher elevations. Whats the difference, do you have larger injectors or something. Or is this a Pathy issue at higher elevations. HMMM 2 Link to comment Share on other sites More sharing options...
rgallant Posted December 3, 2014 Share Posted December 3, 2014 Love the pic. That is the opposite of what I found mine loves high altitude and hot went from 200K at 1/2 a tank to 300+. But performance never changes loaded, unloaded my fuel mileage is pretty much the same. Link to comment Share on other sites More sharing options...
PINION Posted December 3, 2014 Author Share Posted December 3, 2014 mileage is goos, just loose a lot of power at high altitudes. Wondering if west USA folks are different maping Link to comment Share on other sites More sharing options...
Tad Posted December 4, 2014 Share Posted December 4, 2014 We take our QX4 from the desert floor at 2,500' to Ouray, CO and do passes that are typically between 10-13K' and it never skips a beat. I would think it's not altitude unless you have a sensor that is not working correctly. Link to comment Share on other sites More sharing options...
PINION Posted December 4, 2014 Author Share Posted December 4, 2014 could be a sensor, no codes though. dunno. Link to comment Share on other sites More sharing options...
Manik Posted December 5, 2014 Share Posted December 5, 2014 Turns out, once I dropped to lower elevation it went back to beast mode. So, I will be returning to the west and to higher elevations. Whats the difference, do you have larger injectors or something. Or is this a Pathy issue at higher elevations. HMMM Honestly, the PCM should compensate for the elevation difference. Carbureted, not so much. What you probably experienced was air filter freeze up. Snow gets caught up in the air box, melts enough to moisten the filter element and then refreeze with the influx of freezing cold atmosphere. Used to happen ALOT when I worked as a mechanic in Alaska, same symptoms as your issue. No real fix for it other than rerouting warm air from the engine bay. My 2 cents for what it's worth. Bubba..... Link to comment Share on other sites More sharing options...
PINION Posted December 5, 2014 Author Share Posted December 5, 2014 this was all before that pick, that's east coast beast mode. no issues that day. the pic was for fun. this only happened above 3k feet, no snow. the whole month I was in Nevada and Southlake. didn't stop being an issue till I hit Nebraska, elevation around 2k. no issues east of there. Link to comment Share on other sites More sharing options...
Karmann Posted December 6, 2014 Share Posted December 6, 2014 In theory high elevation air has less oxygen, and therefore creates less power in the motor. But as was mentioned, the ECU already knows this and can tune the majority of it out with different fuel parameters. So I don't think mine sees noticeable "altitude sickness" for this reason. For me, even with the VQ, you notice weight if you have a lot of gear going up a long grade, maybe that's what you're noticing. Over the summer, consistently sitting at 7k or above in Northern Arizona and New Mexico, I noticed no power loss when going up hills, and I usually reside at 30' of elevation on the coast. Link to comment Share on other sites More sharing options...
PINION Posted December 6, 2014 Author Share Posted December 6, 2014 I thought that with the gear on the way there, but was there for a month and was consistent. I think there is an issue with engine management at this point. It has a Knock sensor code, but even a Nissan Mech. said that shouldn't cause the issue. I will let Nissan hook it up soon. I have to knock up my GF so I have a child to spare first though, I really like to other two and don't want to part with them. Link to comment Share on other sites More sharing options...
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