Missing badly when stoped on gear. Had codes checked and they are HO2S 11 and HO2S 11. I'm thinking fuel pump but I can't find the test valve and not sure what the pressure should be.It has 88000 miles.I could be wrong thinking this but it is listed on both codes.I'm thinking if not pump it could be mass air flow sensor. any help would be great.
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The code is for fuel system lean bank one. That means the computer can not make the engine run rich enough to get the O2 sensor to switch from lean to rich. It should also set a code for the cylinder miss, the problem could be dirt in the fuel filter or a problem with one of the injectors based on your statement about running low on fuel. It could also be a low fuel pressure problem due to stuff clogging up the screen in the gas tank. Sometimes the problem is the O2 sensor but I doubt it in your case. You could try replacing the fuel filter and running some injector cleaner thru the fuel system to start with. The code needs to be cleared after the miss is repaired to see if the light will stay off.
missing would show itself at low engine speeds.bad starting.or heavy load (going up steep hills)a miss at high speed would not be felt (normally)without other symptoms(lack of power etc)have you tried using higher octane fuel......mazda rec 92+ octane...
Ford 2004 6.0, Driving down road seams like when it starts warming up it starts Missing or accelerating,jerking,as long as you keep the acceleration it seems to work as soon as you level it out it starts missing,even dies at stoping sometimes...Changed fuel filter, put fuel additive in tank still missing,HELP