my 1994 mazda b4000 4.0 5 speed 4x4. when i got the truck i was getting 650km to a tank not i am luckly to get 300 wtf... i work at a shop have checked a lot of ****. o2 seem fine exhause is not pluged intake seems to be good to. checked the regulated fuel pressure at the rail in spc @30PSI. checked the pump pressure its 30PSi when checked inline when running . did a dead test and test found its pump can can go to 90PSI. i have changed the fuel filter fuel pump and the regulator. anyone have the same problems or anywhere to go from here.
have checked the wining to the pump am getting a good ground and 10.v ref from fuel pump plug.

 

what you need try ,, is have a good fuel injector pressure cleaning

they pull the fuel pump fuse and attach a high pressure fuel injection cleaning machine

( they do it through the fuel rail connection )

 

i am going to try that today. hoping this is the fault with it . any other ideas would be good to.

 

i cannot understand why some people pay top dollar for vehicles these days

and still pump sub-standard fuel through their engines

it is always a good idea to at least drop some fuel injector cleaner into your gas tank before you re-fuel

1 bottle a month is good insurance ,, to prevent engine problems down the road

 

Have you checked your tire pressures? Bearings? Alignment? How long have you been getting worse mileage?

 

First off, mike make your own account!!!!! Stop using mine dick head!!! Second, it is my buddy who made this thread for his truck. He has done everything short of changing the injectors totry and fix this problem. It's not tire pressures or bearings or anything else like that, although all those things will affect mileage they won't make you lose that kinda mileage all of a sudden. Does anyone know if he can pull out the injectors to test for proper flow and spray pattern? Anything else he can try? Thanks guys

 

Does it smell rich? You could pull the injectors and see visually inspect them, I don't know if ford would have a test bench for them or not.

 

did the injector flush still the same going to swap some injectors. also when its cold in the morning the truck stalls in the morning have to try cranking and giving fuel at the same time what could that be also my o2 reading are saying ritch maybe somthing in the intake is not working and i have checked the IAC it good.

 

yes you can pull them and try them on a bench... how to do this on your truck i don't know, i know a shop did mine, pulled my fuel rail completely off, reinstalled the injectors, held them in with a massive amount of zapstraps, and hooked it up to the injector cleaning system, which pressureized the fuel rail, and then triggered them individually (i forget how) and we checked how they sprayed... not well kept cleaning them and they slowly got better...

things that can make a difference in your fuel consumption and mixture... throttle position sensor, o2 sensors, mass airflow sensor, bad plugs, poor timing, and of course a VACUUM LEAK

i put my money on a vacuum leak... take a can of something combustible, something like intake cleaner works well, i think, and spray it all over, slowly, being close to the motor, anywhere that there COULD be a vacuum leak, do this while the motor is running, you are looking for a change in rpm when you hit somewhere... pay special attention to the vacuum hoses, which could easily be overlooked... a cracked hose is where i think the problem is going to lie

 

if the injectors are ruled out

replace the PCV valve,, and check the moulded rubber hose between the engine and brake booster
also check all of the hoses that feed the emissions system
and moulded rubber that has any bends in it ,,are usually the first to crack and leak

remove the EGR valve ,, and check for excessive carbon build-up ( carbon will cause the valve to jam in the closed or open position )

and weezl you have the same colour package as my 07 ranger fx4

 

oh i forgot to mention as well

check all of the intake system for any clogging or restriction

if you still use a paper air filter,, pull it and check to see if the paper filter is damp or soaking wet

i switched to a k+n air filter to prevent that problem

when the roads are wet from melting snow,, a-lot of moisture can be sucked up into the intake,, thus soaking the paper air filter ,, and thus cutting down the amount of air that pass through the filter
( sometimes a very wet paper filter will not allow any air-flow through it at all )

 

i dont think you can change the timming on a coil pack i bleave it all ecm controlled

 

i think you are right... i was more refering to generality of ANYTHING that could cause it... timing COULD still be an issue on his truck, it would just be a computer related issue, rather than a tuning issue...

 

i got a vacume gage today going to try that and check all my lines. im starting to wonder if the coil is getting weak normally they just crap out on you.

 

vacuum gauge probably won't tell you if there is a vacuum leak, just how much vacuum there is...

check this out...
Engine Vacuum Leaks

i had my brake booster vac line fall of on my mustang all the time, the only real notice i had when it happened was A) my brakes turned rock hard and B) i had a little bit of a lumpier idle, but it stall ran and drove well... never went more than a few blocks like that though, so i don't know if it would make a huge difference in fuel, but i have always been taught that vacuum leaks cause a motor to run rich... not sure how, but it does...

the vac line to the brake booster on my mustang is 1/2" ID tubing, so it's a big line!, major leak

 

nice link man that is a good tech tip adding to my favorites. my vavle covers are leaking verry show going to relpace the gaskets look at the injectores can change the pcv and intake gaskets