OK guys and girls, I have a problem with my 2001 Ford F150 4.2 V6 .
Let me give you the history,and lets see what you think. My truck sat
for almost a year because i was away.It was started weekly and driven
1 to 3 times a month,short and long trips.It devolped a random skip,or
mis-fire.I did’nt matter what the weather was or the temp.I ran some
injector cleaner through it for a while,replaced the fuel filter and
after several months the problem was gone.my check engine light was on
I took it to autozone and had the codes read it was a p401 code
insuff. EGR flow.I took off the egr valve cleaned it, made sure the
pinstel whould operate.After i cleaned the EGR I took it back and the
p401 code was gone but i developed new ones.Now i have P171 lean
missfire bank 1 cyl 1 p301 p303.Ok sorry let me go back just a bit,it
ran fine for about 6 months then 1 day i started it up and itran
poorly since. I replaced the DPFE sensor,plugs,wires,and the 02 sensor
for bank 1.Somtimes when I start it i smell fuel,coming out of the
exhaust.My check engine light flashes when i’m under a load,telling me
i have a mis-fire this has destroyed my cat. on that side again i have
been running injector cleaner through it, and it has been getting
better.The light only flashes once and a while.I have looked for
vaccuum leak by spraying carb. cleaner and prophane. around the
intake,engine area,I have cleaned the mass air flow sensor with the
right cleaner. Please help,if anyone has some of these similar
symptoms Let me know,I should take it to a real mech. but i just do’nt
have the cash.
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