If it were the fuel pump wouldn't that problem be more at full throttle then half throttle I just purchased this truck and really don't know any history bought at a repo action it looks like the throttle position sensor was just replaced
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Re: 1991 ford explorer
Before you get into any real big expense look into the frame on the drivers side of the door that is where the fuel filter is located also look under the hood and check out the fuel pump relay the lid on the fuse box should tell you which one it is also go to Walmart and get a bottle of STP gas treatment because you have water in the gas as well
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Hi sounds like the typical fuel pump or filter problem with these cars, best way to tell is take top fuel hose off on fuel filter under hood, turn key on ignition (not start) and fuel should pump out, if not its your pump, just beware of doing when engine is hot
There are several problems and they are all related. Check plugs if they a white with gray ash buildup. Gap .054
1. Fuel pressure regulator, if it is ruptured fuel will be vacuumed straight into the the intake causing idle surge also in causes temperature fluctuation and poor performance. It will also cause lean running condition. 2. The Mass Airflow Sensor also has a huge impact on mixture, defective symptom was a knocking and clattering under load especially uphill. Cleaning will only give temporary fix. 3. Spark Plugs- Do not use Platinum plugs they run hotter than standard plugs! 4. Any intermittent starting problems are likely fuel pump related, when you turn the key in the ignition you should hear the pump running!! 5. Preventive maintenance is the key change your fuel filter at recommended intervals.
I have a 94 Explorer, it run very poorly after changing these items it runs great, restored power, idles great and great mileage again and finally no more temperature fluctuation.
Could be the electric fuel pump if so equipped. What area(s) of the car the the fuse control, that should give you a hint. Some cars have a fuel pump system that the pump kicks on and off to keep proper fuel pressure up in the fuel lines. If not working right will run battery down in a few days.