gas mileage question?
#1
gas mileage question?
First off its a 99 ECSB Z71 5.3, only mods are a cat-back exhaust. I've been noticing i'm only getting about 11mpg in this thing and thats driving fairly conservetively. Is this normal? Recently I replaced plugs, fuel filter, air filter- the regular tune up stuff and didn't seem to notice much of a difference. So what I'm wondering is if it has to do with being a cheap *** recently and only runnin 87-89 Octane gas and possibly having a boat load of KR. Any ideas? At first I thought it might have been a 4wd issue, but then found out that all the autotrac front driveshafts rotate in 2wd mode-the thing that lead me to believe that could be an issue was the fact that it seemed like the front steering was stiffer when parallel parking the beast.
Thanks
J
Thanks
J
#4
I'm totally lost as to what it could be, especially since i've changed all the regular tune up crap, even did the tranny fluid & differential fluid. I'm going to have to run some better gas in it once and see what kind of mileage I get out of that.
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Originally Posted by w41quad4
I'm totally lost as to what it could be, especially since i've changed all the regular tune up crap, even did the tranny fluid & differential fluid. I'm going to have to run some better gas in it once and see what kind of mileage I get out of that.
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#8
I'm sure its not stuck in 4wd, i've test that theory and roasted the rear tires-which im sure didnt help the gas mileage.
The only other thing I can think of is maybe its time to replace the two up-stream O2 sensors there are 74k on the originals.
The only other thing I can think of is maybe its time to replace the two up-stream O2 sensors there are 74k on the originals.
#10
Haven't checked the FPR, is there a schrader valve on our trucks? I haven't ever noticed one, but can't say i've looked & now its a bit to dark out-but i have a fuel pressure guage sitting here.