1990 ford Aerostar 4.0L

Discussion in 'Ford Truck Forum' started by Will Kistner, Dec 22, 2016.

  1. Will Kistner

    Will Kistner New Member

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    Hello my name is Will ok so far i have replaced the Throttle Position sensor,Air charge sensor,crank sensor,idle air control valve MAF and MAP sensor, O2 Sensor and i replaced the Fuel pressure regulator and now my van is acting like it is getting to much gas please help I'm going nuts here oh and i just replace the Coil pack..
     
  2. 88fivespd

    88fivespd Full Member

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    Have you replaced the ECT(engine coolant temperature) sensor? Don't confuse this with the temperature gauge sending unit. A bad ECT sensor will certainly make it run rich.
     
  3. Will Kistner

    Will Kistner New Member

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    Yes i have. now my fuel pressure is at 24 engine off and 29 engine running. Isn't it supposed to be between 40-45 PSI?
     
  4. 88fivespd

    88fivespd Full Member

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    I wouldn't know what the fuel pressure should be on that vehicle. I am more familiar with Ford pickup trucks of that vintage. I wouldn't think too low of fuel pressure would cause it to run rich.

    Just to double check, you did in fact replace the ECT sensor? They are usually located in or by the thermostat housing. A lot of times someone will replace the temperature gauge sending unit and think they replaced the ECT sensor.
     
  5. Will Kistner

    Will Kistner New Member

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    I actually replaced them both.
     
  6. 88fivespd

    88fivespd Full Member

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    I don't know what to say now. Maybe you have a bad injector. I'm sure you checked that the air filter isn't too dirty and the air intake not plugged?
     
  7. leolkfrm

    leolkfrm Full Member

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    what were the scan tool readings before you change all those parts?, i realize it would be obd1, but it may have shed light on it
     
  8. dirtrider73068

    dirtrider73068 Senior Moderator
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    The fuel pump may be getting weak and on its way out.
     

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