the returnless system was introduced in 2006. I was wrong about being able to check vacuum there. The change is so minimal you will not see it on a gauge.pcharm129 said:
I always reset the odometer after each fill up. Force of habit at this point. No matter how the needle dances through fuel level inaccuracies, from day to day or period of day to period of day, it ALWAYS ends up at a quarter tank after every 40 or so miles. However, im going to let it play out a little further this time because it seems that she MAY have improved by a few miles. Which may take a while because i do some idling every now and then for work. But i know the truck well enuff to be pretty accurate with a conclusion. Realized i've been going through this crap for a bit longer tha i thought...coolasice said:
Thanx littleblazer.littleblazer said:
I had some intermittent stalling from not doing a re-learn after cleaning the throttle body.pcharm129 said:
The stalling had always been a symptom during this whole mileage issue. Used to be worse though.signalnc said:
I took my resonator off years ago. I WISH i could get 450 miles. That would be AWSOME at this point. I get about 320. And dont forget i have s 25 gsl tank...nagyiii said:
Yeah i know. That's why i use 1/4 tank #'s. Much easier for consistancy. I know the guage fluctuates. Sometimes DARMATICALLY (at least mine does). But no matter WHAT, it ALWAYS lands on a 1/4 tank after 40 something miles. Its as dependable as the Farmer's Almanac. But as i previously stated, it MAY have improved by a few miles since the plug change. Hard to judge though because of the idling thing. But again, since most ppl on the forum insist that it has to run the full tank, i'll do it that way from now on. Its just going to be difficult and take longer.Wooluf1952 said:
Thanx bro. If my math is correct, that's about a 1/4 tank every 6 hrs. I think its closer to 1/4 per 8 hrs, but i'll run with your calculation. This whole situation is nowhere near perfect. All these calculations here are educated and empiracal approximations. Thes one thing i think this ENTIRE forum can agree on is that i should NOT be getting 200 miles or less on a 25 gal tank, and that something VERY wrong is going on. Especially with everything that we've ruled out thus far. I think the stalling is related to the mileage problem. But of course i cant say for certain. I have no idea about fuel trims, but apparently THAT seems to be one of the significant factors here. If i can figure out what would/would not cause such high fuel trims, WITHOUT tripping CEL, and possibly cause occasional stalls, I think the sun will shine and fairys and butterflies and rainbows will finally permeate my dismal world...lol!signalnc said:
320 miles on a 25 gallon tank = 12.8 miles per gallon, and really it is higher because you're not running out. Say you run it down and put in 24 gallons. That is 13.3 mpg. 23 gallons would be 13.9........obviously not bad if it's around town.....if it's on the highway that would not be good and I would be concernedpcharm129 said:
Thanx Mooseman. But i don't see how that would help at this point. If the truck was running correctly, and i wanted to monitor how certain mods (CAI, resonator delete, pcm tune, etc) affected the mileage, i could see it being of assistance. In this case, however, there are no small increments to measure. Its an egregious fact that I'm getting less than half the mileage i should be. Until THAT condition chandes, i don't see point of an mpg logging app. FACT: i have a 25 gal tank. FACT: on average this truck should get 15mpg city. FACT: i am getting less than 200 miles on a full tank (which i personally know to be in the 160's). Some hwy driving is included in my total mileage. But that only shows that the 160 miles per tank may be even worse. But i dont want us to nit pick over that. Its negligible. If i DOUBLE my miles per tank it would still show that there's a problem.Mooseman said:
I use Torque. I'm just not versed wit fuel trims and such. Im gonna try and get a little familiar thru google. I drove from Autozone to my house today and let Torque monitor in real time. I noticed that FT 1x1 went as high as 9.4 and as low as -11.2. And that FT 1x2 never moves from 99.2. Have NO idea what that means though...☺signalnc said:
Lol! We were talking about HWY miles... I was getting around 270. But on my trip to Myrtle Beach a month ago, i got something like 317! Good catch though...signalnc said:
I have absolutely NO idea what gear ratio i have. How can i find that out for you? And i am DEFINITELY a hard driver. I know this is also putting a bit of a sting on my mileage, but im not really concerned about a mile per gallon or so loss. Its the 50%+ miles per gallon loss! Without 400lbs of gear...lol. Maybe 200lbs. I am also with you concerning the injector(s). Thinking a nozzle may have gotten enlarged and is maybe spraying too much gas without the PCM knowing it. When your fuel pump started to go did you get a CEL? Fuel trims show a problem?littleblazer said:
Okay, You have 3.43s. Which should be the best fuel economy of them all. It will make the truck a little sluggish though. There is something seriously wrong here... I just don't know what. You could pull an oil sample and check for fuel dilution with an oil lab perhaps? That could point you toward a failing injector.pcharm129 said:
I see no indications of any of the above. Well... I have had issues with the ABS module. Simultaneous ABS/BRAKE lights coming on together and in tandum. Security light too. All while driving. Had the module changed like 18 months or so ago. Started happening every once in a while. Mechanic said appearef to be loose wires. Fixed for a while, now its back. Dont think these are related though. Also having a problem with the Park Shift Switch (or whatever its called). The switch in the shifter that releases the key solenoid when you shift into park. It makes the solenoid jump with the slightest jiggle to the shifter or center console. And i usually have to jiggle it to release the key when i shut the truck off. Again, pretty sure its not related.signalnc said:
No this wasn't mentioned. I'll definitely do that. Don't have stock tires tho. 22's with 35 tires. Same diameter tho. What's TCC???Sparky said:
No the blower stays on. And i changed the ignition switch already. When the situation was chronic. Just cause...Mounce said:
gmcman said:
I built a smoker and tested for vacuum leaks this week. Didn't see any...gmcman said:
Ok, those are mud tires. I very seriously doubt you will see 20 MPG unless going downhill.pcharm129 said:
TCC is torque converter clutch. basically, at highway speeds the cluch in the torque converter locks so as to reduce losses from the converter and reduce heat buildup from it as well. If that isn't working then the clutch stays unlocked and you loose a fair bit through the converter as engine RPM is a few hundred higher (more gas burned).pcharm129 said:
That's the Torque Converter Clutch. Basically it's a clutch built into the torque converter that locks up the tranny to the engine, like a manual tranny, while cruising.pcharm129 said:
They're not mud tires. They're all season low pro's. I think you looked at the wrong picture.gmcman said:
Ok, copy. I didn't see that tire, my bad.pcharm129 said:They're not mud tires. They're all season low pro's. I think you looked at the wrong picture.IMG041.jpg
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