2006 5.4 Falling Flat
#1
2006 5.4 Falling Flat
Not sure if this is the place to post .Problem with 2006 F`150 5.4 3v , 81,000 miles . The main symptom is it runs pretty well until you floor it up a hill or go to pass someone?Have pulled codes with only flashing CEL and steady CEL . PO300 , PO306 1st time and PO305 with steady CEL . I am going to throw this out that I think it is the MAF sensor . Because multiple intermittent misfires and #6 misfire and then a week later a #5 misfire does not add up to spark . I installed new fuel filter and I have checked for corrosion on the fuel pump module (ok). So unless the pump is bad and even though it is not showing a MAF error code could it be bad ? I have cleaned it with alcohol . I guess I would need to T at the fuel filter to check pump pressure ? I know they have lots of problems with COPs and Plugs but the symptom is always the dying on full throttle and pulling hills can't get past 55 mph . Sorry so long a post but Thanks
#2
Senior Member
Not sure if this is the place to post .Problem with 2006 F`150 5.4 3v , 81,000 miles . The main symptom is it runs pretty well until you floor it up a hill or go to pass someone?Have pulled codes with only flashing CEL and steady CEL . PO300 , PO306 1st time and PO305 with steady CEL . I am going to throw this out that I think it is the MAF sensor . Because multiple intermittent misfires and #6 misfire and then a week later a #5 misfire does not add up to spark . I installed new fuel filter and I have checked for corrosion on the fuel pump module (ok). So unless the pump is bad and even though it is not showing a MAF error code could it be bad ? I have cleaned it with alcohol . I guess I would need to T at the fuel filter to check pump pressure ? I know they have lots of problems with COPs and Plugs but the symptom is always the dying on full throttle and pulling hills can't get past 55 mph . Sorry so long a post but Thanks
https://www.f150forum.com/f4/04-150-...-45mph-298842/
#3
Mark
iTrader: (1)
A flashing CEL indicates a mis-fire condition. Plugs or COP's ..
#6
I understand the COPs and plugs could be bad but when I go up a hill and then get to the top it does NOT run better it continues to sound like a huge 4 barrel carb that is starving for fuel . Even on flat road it will not accelerate if floored .
#7
the flooring it part makes me wonder if it could be vacuum related... maybe a cracked intake? My first thought was fuel pump module, cops, or plugs... but i think normally you'd get one cylinder for codes because it seems unlikely that you'd have 2 cops or 2 plugs go at the same time.
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#8
Well I did a vacuum test it is great and steady , i read on one of the thousand or so forums that a person was having similar symptoms replaced cops n plugs , few other sensors and it ended up being a wire harness was too close to something . I hope to do a fuel pressure check and rule that out , then go from there ! I just cant believe plugs bad at 81,000 miles . Sure sounds like fuel starved to me and if that is the case the maf sensor is the main talker to the computer telling how much air/fuel the engine needs . I have a '65 Chevy Belair 2 dr post with a 496 ci engine and it is 1 of 2 things if it don't start , gas or spark and no computers and boy does it go up hills !!
Last edited by bemason77; 05-21-2015 at 05:08 PM. Reason: Added
#9
Mark
iTrader: (1)
don't make em like they use to..