07 f-150 5.4 fuel problem (i think)

PASBON · #1 (**permalink**) 10-22-2009, 09:03 PM

07 f-150 5.4 fuel problem (i think)

I have a 2007 f150 5.4 lariat that sputters when I mash the gas , 93,000 miles , just changed fuel filter (had black trash in it), added lucas injector cleaner to full tank and ran tank to neer empty, filled tank , added lucas again and burned half tank then changed fuel filter again . still has same problem , gave a code one time, turned off truck and code went off. never gave code again .checked it with a code reader and everything is fine, engine runs great at normal driving speeds , has anyone had this problem ? I can turn some wrenches, but would like to go straight to the problem if i could and not spend a weekend finding the problem. Any ideas ?
Thanks in advance

LxMan1 · #2 (**permalink**) 10-28-2009, 04:09 PM

I'm going to say look into the TPS sensor and possibly cleaning the MAF.

Have you put spark plugs in it yet @ 93K?

PASBON · #3 (**permalink**) 10-28-2009, 05:50 PM

I just got the truck about 3 months , and I dont think the plugs have been changed .

PASBON · #4 (**permalink**) 10-28-2009, 07:06 PM

got it to read a code , catalintic converter , (po420) the only problem , it was doing this for a few weeks before i got the code.

where can i find instructions to clean the mass air flow ?

baredog26 · #5 (**permalink**) 10-29-2009, 09:16 AM

If your plugs haven't been changed I would change them first. If that doesn't work I would say your converters are bad, and with 90,000 miles they are out of warranty.