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  1. #1

    '98 Ford Ranger P1151 Code

    I bought this 1998 Ford Ranger 4X4 two weeks ago and this code appeared on the way home from the used car lot. It goes into "limp home" mode and also had a stumble. Auto Zone pulled P1151 and P0306 codes off the computer. P0306 was a misfire on cylinder #6, fixed that by replacing the plugs and wires.

    P1151 probable causes are;
    1) fuel pressure high or low.
    2) MAF sensor dirty/defective.
    3) Vacuum leak on engine.
    4) Leaking fuel injector or fuel pressure regulator.

    I replaced the MAF sensor and cleared the codes by disconnecting the negative battery terminal. Ranger runs great for about 20 miles, then the CEL comes back on. I can hear a top-end knock upon acceleration, (around 2500 RPM) and I assume loose (leaking) fuel injector(s)? I checked for vacuum leaks and want to check fuel pressure before tearing into the injectors. Can anybody shed some light on this? I heard there was a TSB on the 1998 year.
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  2. #2
    Banned Leon Phelps's Avatar
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    the "knock" could be the FPR "pulsating" I'd start there before going after the Injectors. Honestly the injectors is one of the FEW things ford did right.

  3. #3
    Digger's Avatar
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    P1151 upstream O2, bank 2 not switching, rich or lean.

    My take: Highly likely the O2 is kaput.


    they have a TSB on carbon knock under accell. A top engine cleaner is used to clean the carbon off the top of the pistons and combustion chamber.
    Last edited by Digger; April 22nd, 2008 at 06:45 AM.
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  4. #4
    therangerstation.com

    that should help ya, those guys are all awesome and give great advice
    90 ranger;I couldn't listen in school, I felt I had a different callin But all everybody did was roll their eyes and start yawnin But this is real life and only you is livin through your eyes There are dreamers, those who want it And us, who won't be denied - Violent J (ICP)

  5. #5
    Quote Originally Posted by Digger View Post
    P1151 upstream O2, bank 2 not switching, rich or lean.

    My take: Highly likely the O2 is kaput.


    they have a TSB on carbon knock under accell. A top engine cleaner is used to clean the carbon off the top of the pistons and combustion chamber.
    Which O2 sensor and about how much do they run? I was going to check that next.

  6. #6
    Digger's Avatar
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    on a ford v6, bank 2 would be the side that has cylinders 4 5 and 6... which is drivers side, I believe. Upstream meaning pre-cat.

    So, upstream bank 2 is the O2 that is closest to, or in, the right side exhaust manifold.

  7. #7
    Thanks! I'll attack that this weekend.

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