Mis fire

Asked by Bill Sep 26, 2017 at 02:32 AM about the 2001 Ford F-150 XL Extended Cab LB

Question type: Maintenance & Repair

I have an 01 F-150 4.2 with 200,000. It recently
developed a miss over the last month which, like
an idiot I ignored. This one on for about a month
until finally within a span of about 3 days it got so
bad it was on drivable but I was able to limp it back
to the driveway. My code reader said P0302 and
P0304, cylinder misfires. This happened once
before in a Ranger I once had and it turned out to
be the coil pack.  So I went ahead and installed a
new coil pack new plug wires and new plugs, but
no help. The plug from cylinder for didn't look too
bad all thougj definitely time to be changed but
plug 2 was completely gummed up with what
looked like burnt oil maybe? I don't think it was
carbon. So next thing I did was put a fuel filter in. It
was pretty bad, in fact it was really bad . It  started
right up and reved strong, real smooth no miss,
although it seemed to idle a little rough. I put it in
drive and took off, it really ran, smooth, accelerated
hard......for about 200 yards, then it would die when
I try to accelerate but I was able to limp it back
home again. I've started it a few times since then
and it revs hard in park. But as soon as I put it in
drive and try to accelerate, it wants to die. In all
honesty  I've had to run it out of gas a few times
and I've been running a lot on empty. The code
reader also said.P0171 system too lean bank  1.
What do you think Gurus?

1 Answer

16,275

Had a similar problem with a RHD F150 in Windhoek Namibia some years back. The vehicle started OK and them started miss firing on the left bank on four cylinders. After connecting the IDS Test equipment and checking the electronics, I found that the left bank down stream Oxygen sensor was switching as it shouldn't. Wee removed the left CAT and found it to be blocked. We removed both CATs and the problem was sorted. What happens with the Ford EECV system is when it detects too much back pressure in the system, the PCM will switch off those cylinders to protect the engine where possible. If you have been driving the vehicle for a while and you happen to go through a puddle or a drift, the water splashing onto the CAT will cool it down too much and crack the CAT brick inside and this will block the CAT. Hope this helps

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