I have maintained the engine and change the oil regularly. The oil pressure gauge runs at correct range as long as I am driving down the road. But as soon as I start slowing down the pressure drops so that by the time I stop it is flat lined. At some point, some one who worked on my truck broke the plastic part at the top of the dip stick. My oil level is fine. Is it possible that the plastic being broken that there is some sort of air flow causing this issue?
Your oil is under pressure as it is circulated through the engine, and at low RPM there is less pressure pumping the oil around. With the broken dipstick, I presume there is an oil-pressure leak and at normal operating speed there is enough capacity to maintain proper pressure, but the leak is more than the engine can overcome at low speed. I would suggest replacing the broken dipstick.
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SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
SOURCE: 1988 AEROSTAR OIL PRESSURES DROPS AFTER RUNNING
oil pump, if it has never been replaced, its time already, also check seals inside the engine and gaskets
SOURCE: fuel gauge reading zero and light on ?
Ford has lots of problems with the sender reliability. Typically, the sender (and expensive fuel pump) replacement resolves the issue. To test, you need to take the connection off of the sending unit, at the tank, turn on ignition, and then ground and un ground it and view results at the gauge. If the gauge responds, the sender needs to be replaced.
There are aftermarket senders that cost less than OEM.
SOURCE: I have a 1986 XLT Lariat F150, 8cyl. 302. The
There is a small voltage regulator in side the dash that controls the gages its on the back of the instrument panal over the speedometer you need to remove the panal to get is it conects almost like a 9 volt battery that the conector likes like but its a lot smaller in side
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If you run anything but ford oil filters on the 6.0 litres, you're gunna have a bad time. I get trucks towed in for oil changes because of aftermarket filters. They start running like poopy (won't let me say cr@p? Really? That's profanity?) before they won't start. (Your engine is heavily dependant on the oil for more than just lubrication)
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