3.0 engine 1994 aerostar: when engine is cold/cool oil pressure gauge is normal; after engine reaches normal op temp, the oil pressure gauge flickers to lower pressure side. no engine noise, or other problems. the flickering happens at stop/slow/turns. i can apply gas while holding brake, and the oil pressure remains steady at normal. any ideas what is wrong?
It could be any number of things, most likely cause is you have a oil sending unit that is wore out and giving false readings. Either buy a new sending unit and change it out or hook an oil pressure tester to your engine and check the oil pressure.
I'd buy a new sensor and replace it myself, because the vehicle is 23 years old and probably the original sending unit, besides the oil sending unit has to be removed in order to check pressure with mechanical gauge anyway.
SOURCE: Trans clunking when slowing down
Sounds like youi may have a few serious problems going on to have that kind of back lash occuring at higher speeds. I have experiance with low spped clunks on Bronkos and your type of vech being a car dealer. One you might try for low speed clunk on take off and braking at stop likts just completeing a stop? Pull the drive shaft and lubricate the splin - two check your leaf springs for weakness and wore bushings - take a look at your shocks - three u bolts holding springs to rear axle housing may be letting the axle housing actually dip or tweak or all those thing in combination - now you may have some serious slop in the pig - transfer case may be causing that clunk - as far as high spped clunk and activity you have a serous problem and you just might drop the transferr case have an accident fliping over..............Mike South Bend Indiana don't just keep driving and making problem worst...........
SOURCE: oil light
You could also have a weak pressure relief valve in the oil pump, or weak pump. You said the light flickers when you come to a stop. If your car is equipped with one, have the oil level sensor checked. It's mounted on the front of the oil pan.With the oil sloshing around in the oil pan and a bad sensor, would also cause the light to flicker. IF THE CAR IS EQUIPPED WITH ONE.
As for the key, if there is an ace hardware near you, go there, they can do it, the one here does, about $69.00. A dealer, probably a lot more.
SOURCE: flickering oil light
This could be two unassociated problems; the flickering oil light can indicate that the pressure sensor for the idiot light is failing- this is not uncommon, the other can be a failed temperature sensor sensor on the main radiator.
The low oil pressure condition may also be indicative of a worn engine part or parts.
It would make sense to have the actual oil pressure checked in a shop to see if it is in the normal range which should lay between ~30 & 60 pounds depending on engine RPMs and engine temperature.
The idiot lights trigger at around 4-5 pounds and this is really pretty late for a warning; if the pressure is actually that low, not only lubrication is too little but the cooling effect of the circulating oil is inadequate.
If it was my car, I would replace both sensors before getting too worried.
The cost of these together (parts only) should be well under $50 US.
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: High temp oil light coming on and off, oil pressure gauge reading
Add the quart of oil. Oil also acts as a coolant.
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