Question about 1995 Ford Ranger Supercab

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Octane Ping and running lean

I have a 2.3 liter 1995 Ford Ranger that is having octane ping at 45 mph or greater even running high octane fuel, when speeds are less than 45 I can intentionally lug the motor and not get any ping. I found it had low fuel pressure and changed the regulator which cured the pressure problem. I pulled the egr valve and it was stuck open so that got changed. Both exhaust sensors were changed. There are no fault codes showing on the obd2. I have run seafoam through it (I believe that it is called that). I have sprayed all around intake areas looking for intake leaks. I'm at a loss on what to do.

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  • gttn Jul 24, 2009

    With further research online I have found this; so thanks may be in order to Pippal;-)

    I have read that there is a problem with the Mass Air Flow sensor on almost ALL ford vehicles from 1990-1999.
    Ford says to replace it.

    Symptoms include..

    * Lack of Power.
    * Spark Knock/Detonation.
    * Buck/Jerk.
    * Hesitation/Surge on Acceleration.
    * Malfunction Indicator Lamp (MIL) Illuminated. DTCs P0171, P0172, P0174, P0175 may be stored in memory.

    There is a TSB on this issue.

    Article No.: 98-23-10
    Date: 11/23/98
    Mass Air Flow (MAF) - Sensor Contamination

    The affected vehicles are:

    Ford:
    1990-97 Thunderbird
    1990-99 Mustang, Taurus SHO
    1991-99 Crown Victoria, Escort, Taurus
    1992-94 Tempo
    1993-97 Probe
    1995-99 Contour

    Lincoln-Mercury:
    1990-97 Cougar
    1991-99 Continental, Grand Marquis, Sable, Town Car, Tracer
    1992-94 Topaz
    1993-98 Mark VIII
    1995-99 Mystique

    Light Truck:
    1990 Bronco II
    1990-97 Aerostar
    1990-99 Ranger
    1991-99 Explorer
    1994-96 Bronco
    1994-97 F Super Duty, F-250 HD
    1994-99 Econoline, F-150, F-250 LD, F-350
    1995-99 Windstar
    1997-99 Expedition, Mountaineer
    1998-99 Navigator
    1999 F-250 HD, Super Duty F Series


    OBDII DTCs

    * P0171, P0174 (Fuel system lean, Bank 1 or 2)
    * P0172, P0175 (Fuel system rich, Bank 1 or 2)
    * P1130, P1131, P1132 (HO2S11 lack of switching, Bank 1)
    * P1150, P1151, P1152 (HO2S21 lack of switching, Bank 2)

    OBDI DTCs

    * 181, 189 (Fuel system lean, Bank 1 or 2)
    * 179, 188 (Fuel system rich, Bank 1 or 2)
    * 171, 172, 173 (HO2S11 lack of switching, Bank 1)
    * 175, 176, 177 (HO2S21 lack of switching, Bank 2)
    * 184, 185 (MAF higher/lower than expected)
    * 186, 187 (Injector pulse width higher/lower than expected)
    __________________

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Change the mass air flow meter.

Posted on Jul 24, 2009

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  • Contributor
  • 9 Answers

Have you changed your spark plug wires and spark plugs , this could cause a miss fire, ( what you call spark knock / octane ping) or it could be a crack in your distributator cap and rotor

Posted on Jul 24, 2009

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  • Ford Master
  • 5,568 Answers

It seems that if the anti-knock sensor had failed it would produce a code but it might be something to check anyhow.

Posted on Jul 24, 2009

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Octane Myth


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