Question about 1997 Ford F150 Regular Cab

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My 97 ford f150 is loafing an when i put on a diagnostics test its reading out 02 sensors an i change all four and i also change the massive airflow sensor, and i also had the fuel system cleaned and its still loafing and still reading out 02 sensors

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  • yungjoefbi Mar 23, 2011

    do u think it may need a tune up

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  • Ford Master
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The O2 sensors are not bad and the ones you took out weren't either, They are just doing what they are supposed to do - report out that you have a problem with the engine. It's bad spark plugs, distrbutor, wires, etc.
The rear O2 ssensors don't even control anything, they just report that the front ones aren;t doing their job.

DTC codes from the CEL light being on?

Posted on Mar 23, 2011

  • gerry bissi Mar 24, 2011

    Whatare the DTC codes? I assume the yellow check engine light is on.

  • gerry bissi Mar 24, 2011

    not likely

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  • Master
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If it's still reading 02 sensors and you replaced them AND assuming you cleared codes I suspect bad cat, converters, The 02 sensors when everything is operating properly, the front 02 sensors read different from rear ones - if they read the same, you get code/light. Plus with your description sounds like bad converter(s)

Posted on Mar 23, 2011

  • gerry bissi Mar 25, 2011

    Go to autozone & get the codes read free. You should check for air leaks in the intake system, especially the big air intake tube if it has convolutes, they could be split. I don't think cats.

    The codes will help. How did you get bank 1 & Bank 2 if they did not read codes?

  • gerry bissi Mar 25, 2011

    Induction system

    Air leaks after the MAF.
    Vacuum leaks (vacuum lines and gaskets).
    Restricted air inlet.
    PCV system.
    Fuel purge system.
    Improperly seated engine oil dipstick.
    EGR System

    leaking gasket.
    Stuck open EGR valve.
    Leaking diaphragm.
    Base engine

    Oil overfill.
    Cam timing.
    Cylinder compression.
    Exhaust leaks before or near the HO2S(s).
    Check intake air system for leaks, obstructions and damage.
    Check air cleaner element, air cleaner housing for blockage.
    Verify integrity of the PCV system.
    Check for vacuum leaks.

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My 97 ford f150 is loafing an when i put on a diagnostics test its reading out 02 sensors an i change all four and i also change the massive airflow sensor, and i also had the fuel system cleaned and its...


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Hello,

You really need to start with basic troubleshooting. Is there spark to the spark plugs? Do you hear the fuel pump prime during initial Key On & during Engine Cranking?

Why did you change the MAF (mass airflow sensor)?

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