Question about 1993 Ford Escort 4 Door

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1993 ford escort 1.9 liter. Scan tool gives a 173 code,O2 sensor, replaced sensor and the car runs intermittently better and then reverts to sluggish running. plugs and old sensor coated with black from improper fuel burn.Fuel pump has been replaced. Any thoughts or solutions?

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  • drjhuatulco Jul 28, 2009

    thanks for your help for $12.99.
    The unplugging of the mass airflow sensor changed nothing as well as the manifold absolute pressure sensor. The coil, plugs ,wires are new as well as the fuel pump, the fuel injectors have been cleaned but the scan tool continues to tell me that that the O2 sensor is in need of repair even though that has been replaced. so in short I'm at the end of my rope and the solution seems to be no one knows how to repair the vehicle.
    J McLaughl;in



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I would check your mass airflow sensor and/or manifold absolute pressure sensor. if you unplug your mass airflow sensor and it runs better then that is the problem. same with your map sensor. hope this helps out. also check for vacuum leaks and make sure your coil, plugs and wires are good.

Posted on Jul 27, 2009

  • Derrick Nichols Jul 28, 2009

    have you checked your catalytic converter. take a temp just before it and then just after it. It should be 100 degrees hotter after if it's doing it's job. also it may be clogged this could be causing your problem.

  • Derrick Nichols Jul 28, 2009

    Also their is no need to be nasty I am trying to help you and have not made 1 cent.



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Using a scan tool, determine if the Bank 1, sensor 1 is switching properly. It should switch rapidly between rich and lean, evenly

1. If it does, the problem is likely intermittent and you should examine the wiring for any visible damage. Then perform a wiggle test by manipulating the connector and wiring while watching the o2 sensor voltage. If it drops out, fix the appropriate part of the wiring harness where problem resides.

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