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My 1997 f150 4.2 is running very rough! The fuel pump, plugs, engine coil pack, and injectors have all been changed. CSS were all cut down and were welded back up. The check engine light came on and the codes were po133 and p0153 and p0305. Could the o2 sensors cause it to run so rough and missfire in cylinder 5? Or should I start looking at the computer?

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It could be the co2 sensor, but have you thought of having a cylinder leakage test done?? A competent garage should be able to perform this test for you. Basically they pump compressed air into each cylinder on the firing stroke, in turn, to establish that all is gas tight. If you have a broken piston ring or leaking valve, this will show up as a leak and could explain the rough running, especially on number five.

Posted on Jan 19, 2013

  • Anthony Mestas Jan 19, 2013

    Thanks for responding! My boss had this truck for years, he started havi this same problem and changed injectors, coil pack, even bought a new motor from ford had it put in and it ran a little better now I right back to where it was! Got to be something in he truck! Where should I go next? Cats were removed and put back on, I cleaned and checked maf sensor the computer read po133 po153 po305 until I disconnected the battery! The new engine has 30,000 miles on it ad runs the same way the old one did! It's gotta be something on the truck



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SOURCE: I have a 2000 buick lasabre that has been running

plugs and or wires.
for some reason the spark is jumping out of the wire or plug.
the plug insulater may have a crack in it.
also use a carb spray to clean out the throttle body at the throttle plate.
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Testimonial: "thanks I think a good tune up is what is needed, hopefully that's all"

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