I have a 2000 f350 ext cab longbed 4x4 7.3 only mods are 6637 filter straight piped and edge evo 2. And a of recently it's been getting horrible fuel mileage like around 7mpg. I just replaced all the filters and oil, and the manifold ambient temperature sensor, waiting on ICP sensor to come in and i'll replace that as well. The brakes aren't dragging either. any help would be appreciated thank you.
horrible fuel mileage
- Thread starter 83f350
- Start date
mattman347
Member
Miles on the truck? Gears? Around town driving? Speedometer correct?
littleredstroker
New member
leaky uppies?
lincolnlocker
Well-known member
stock size tires and lift? ebps and tube clean? is it a smokey pig? boost leaks? up pipe leaks? how old is all the fluid in the trans, tcase, and rearend? how much idle time do you let it have? whats your reasoning for wanting to change the icp sensor? any codes? is it in 4x4 or do you leave the hubs locked in? front end alignment good?
suspension and tires are stock sized. I haven't checked the ebps but I will tomorrow, it doesn't smoke and theres no boost or up pipe leaks. trans fluid still looks good but changing this weekend, not sure on t-case and diff fluid I changed maybe 4k ago. not much idle time maybe 10min to warm up in the morning. and I'm changing the icp sensor because it threw a code and because if I unplug it the idle doesn't change. alignment is good and in 2wd with unlocked hubs.
lincolnlocker
Well-known member
you used a boost leak detector? everything else sounds good... lots of times the up pipes leak on the back side of the pipes where you cant even see it.. reach back in there or look up from underneath the truck and see if you can see better that way... if ebps and tube are plugged its usually goes hand and hand with poor mileage... might just have some horrible fuel in it... whats your fuel pressure? hows the hpop pressures? might try a couple cans of sea foam in the tank or couple quarts of kerosene..
lincolnlocker
Well-known member
any tunes on your truck? hpop needs a scanner to read psi or make a gauge that can go to 4000psi... fuel pressure needs a gauge.. scanners don't read that..
littleredstroker
New member
Why does the ebpv tube being clean affect mileage
sent while trying not to JJ My rods!!!!!!
sent while trying not to JJ My rods!!!!!!
lincolnlocker
Well-known member
yeah you should be able to hit over 20 psi even with a caned tuner on your truck. fuel psi is measured from a port on the top rear side of the fuel bowl and will need an adapter from orb to npt in order to do it right. or find a fuel rail plug in the heads those should be npt already.. what kind of scanner do you have? plug it into the obd port under the dash and find engine data stream and scroll down till you find icp and icp duty cycle.
its another parameter that the pcm reads for adding fuel.
live life full throttle
lincolnlocker
Well-known member
record idle psi and dc and while cruising and at wot... just because you can hit over 20 psi doesnt mean you still dont have a boost leak. whats your boost at cruising speeds and wot?.. get boost leak detector and check it.. fan clutch froze up at all or does it spin easily?
live life full throttle
live life full throttle
alright, I'll see if I can get someone to read me the numbers tomorrow. and if im crusing at 45-50ish I beleive i'm pushing 1-2psi. and at WOT it's 26 i beleive. where can I get a boost leak detector? and the fan clutch spins freely
Strokin'99
Member
I'm gonna just go and state the obvious here but have you checked for leaks at the fuel bowl and the drain tube for it?
