Bizarre 2.3 L Ranger Oil Pressure

During some recent highway driving the oil gauge pressure dropped down to 0. The oil level was ok and the pressure came back when restarted. The pressure dropped off at higher rpm. The temperature may have gotten hot
but it did not boil over. I changed the oil from SAE 10-30 to SAE 20-50 because it was taking about 30 seconds to build pressure when cold starting. At this point at about 2500 rpm the pressure will drop to 0 but if left to idle the pressure picks right away. After 5 minutes the pressure pretty well goes to normal (beyond the mid-point) and the engine sounds tighter. Restarting the engine after a 10 minute rest does not create any problems. The engine is not burning oil nor leaking oil.
This oil pressure vs. rpm is all backwards. Can anyone shed some light on this.
Regards, RDL
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The oil drainback holes in the cylinder head may be stopped up, thus at higher RPM the oil is all being pumped into the top of the engine, uncovering the oil pump pickup.
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Jammy Harbin
J & J Electronics, Inc.
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loose and plugging the oil pickup screen. The symptoms were pretty much as you described. Bob
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Re: Bizarre 2.3 L Ranger Oil Pressure Group: alt.autos.ford Date: Mon, Aug 9, 2004, 11:02pm From: snipped-for-privacy@nospam.com (Bob)
During some recent highway driving the oil gauge pressure dropped down to 0. The oil level was ok and the pressure came back when restarted. The pressure dropped off at higher rpm. The temperature may have gotten hot but it did not boil over. I changed the oil from SAE 10-30 to SAE 20-50 because it was taking about 30 seconds to build pressure when cold starting. At this point at about 2500 rpm the pressure will drop to 0 but if left to idle the pressure picks right away. After 5 minutes the pressure pretty well goes to normal (beyond the mid-point) and the engine sounds tighter.   Restarting the engine after a 10 minute rest does not create any problems. The engine is not burning oil nor leaking oil. This oil pressure vs. rpm is all backwards. Can anyone shed some light on this. Regards, RDL
They had some problems with the sealant Ford used to seal the oil pan coming loose and plugging the oil pickup screen. The symptoms were pretty much as you described.                                                                   Bob =============== i agree with bob. there was a recall on this and ford did the repair free on my daugther's ranger. she had a 1992. and it cured the problem.
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I'm with "Bob" on this... you either have a clogged screen or badly worn bearings... or a bad sender.
If you have a gauge and the ranger is 90 or newer... good chance the gauge is dummied, using a switch and resistor instead of real Pressure sender.
If you've only seen good and no pressure, thats what you've got
So you can try a new sender, if you want to convert it to a real one, tccoa.com has a tech article
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Thanks for thinking about this.
It appears that I will be draining the oil to check the screen but somehow that does not look right. First of all I will check for accumulation of oil in the top end.
This problem lasts about 10 minutes until the engine warms up.
Going around a sharp corner, before engine warms up, drops the pressure to 0 even if the vehicle is coasting in neutral.
Everything is normal after 10 minutes when the engine sounds tight. Regards,
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